Read this entire manual before operating.
Contents
1.2. EE E RESISTIT MANUAL WINDING RESISTANCE Units Ohms Material COMMENTS DEFICIENCIES lt Show Manual Tests Check Button to turn off on the manual test table Right clicking on Test will start a test with current flowing out H1 H2 and X1 jumpered in the unit and Current return Right clicking on the H1 H2 open cell will test resistance using H1 H2 leads Right clicking on the X1 X2 open cell will test resistance using X1 X2 leads Description field is used to type any comments the customer wants to describe the test Rev 3 Sept 2013 41 Megger AVTMMTO3xx Rev 3 Sept 2013 42 MTO330 300 Series PowerDB Lite Introduction PowerDB Lite is a free but limited capability version of the PowerDB software tool that is designed specifically to control and or extract data from Megger instruments The primary difference between PowerDB Lite and PowerDB is that PowerDB is designed to work with all manufacturers equipment and has field and office synchronization capabilities PowerDB Lite will present your test data into a professional looking data form that can be sent to a printer or pdf file distiller such as PDF995 PowerDB Lite allows you to use a sub set of the standard PowerDB forms that are appropriate for specific Megger instruments PowerDB Lite detects the in
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4. Rev 3 Sept 2013 Instruction Manual for Transformer Ohmmeter DC Winding Resistance Test Set MTO300 MTO330 Catalog Number Catalog Number MTO330 Read this entire manual before operating Megger Valley Forge Corporate Center 2621 Van Buren Avenue Norristown PA 19403 2329 U S A 610 676 8500 WWW Megger com Transformer Ohmmeter DC Winding Resistance Test Set MTO300 MTO330 Copyright 2011 by Megger All rights reserved The information presented in this manual 1s believed to be adequate for the intended use of the product If the product or its individual instruments are used for purposes other than those specified herein confirmation of their validity and suitability must be obtained from Megger Refer to the warranty information below Specifications are subject to change without notice WARRANTY Products supplied by Megger are warranted against defects in material and workmanship for a period of one yeat following shipment Our liability is specifically limited to replacing repairing at our option defective equipment Equipment returned to the factory for repair must be shipped prepaid and insured Contact your MEGGER representative for instructions and a return authorization number Please indicate all pertinent information including problem symptoms Also specify the serial number and the catalog number of the unit This warranty does not include batteries lamps ot
5. H1 H2 TEST2 Current flows from H2 to H3 Voltage reading H2 H3 TEST 3 Current flows from H3 to H1 Voltage reading H3 H1 8 Figure 7 Y reading sequence Rev 3 Sept 2013 33 Megger 3 Three Phase Delta Configured Winding TEST 1 Current flows from H1 to H2 Voltage readings H1 H2 H1 H3 H2 H3 TEST 2 Current flows from H2 to H3 Voltage readings H2 H3 TEST 3 Current flows from H3 to H1 Voltage readings H3 H1 Figure 8 Delta reading sequence AVTMMTO3xx Rev 3 Sept 2013 34 Transformer Testing Testing Delta Configured Windings Testing Delta winding resistance may be a vety time consuming procedure in particular LV winding deltas the correct balance time can take up to 30 60 minutes for a large transformer The method for improving test time for delta configurations requires that both the high side and low side be connected in series with the MTO s current source see connection Table 1 By using both HV and LV windings to magnetize the core the effective test magnetization current increases with the turn ratio simultaneous winding magnetization SWM As an example testing the Low Voltage side of a 100 10 kV Yd transformer with dual side injection at 10 15 the same as testing only the Low Voltage side of that same transformer 68 A Even if only one side of the transformer needs to be tested connecting both high and low windings in serie
6. 2 5 TONS ud 6 Figure 4 Single Winding Measurement Primary Secondary 20 Figure 5 Dual Winding Measurement Primary and Secondary 21 0 IN Fea me Sed e Det 52 33 Pisure o Delta te adine Sequence osea oper ead a e e SU ede EDU RA ERR RAM 34 AVTMMTOSxx Rev 3 Sept 2013 Upon Receipt of Product Prior to operation check for loosened hardware or damage incurred during transit If these conditions are found a safety hazard 1s likely DO NOT attempt to operate equipment Please contact Megger as soon as possible Transformer Ohmmeter Test Set MTO330 Transformer Ohmmeter Test Set Rev 3 Sept 2013 lii AVTMMTOSxx Rev 3 Sept 2013 1 Getting to know the MTO Product Overview 300 330 The Megger Transformer Ohmmeter is a line operated field portable instrument designed specifically to measure the DC resistance of all types of magnetic windings safely and accurately Its predominant use is the measurement of the DC resistance of all types of transformer windings within the defined range of resistance It can also test rotating machine windings and perform low resistance measurements on connections contacts and control circuits I
7. 471 Current is flat or dropping while charging Current leads not connected 472 Break before make error Lead removed during testing gt 10 current H1 failed Vrelay3 failed change during testing Auto range current standard deviation too 4 4 4 4 4 73 74 75 76 77 78 4 high Rev 3 Sept 2013 63 Megger CODE Error Description Possible Cause 479 Auto range voltage is too low 481 Over didn t stay set for normal transistor protection test 482 Over didn t stay set for fast transistor protection test 483 Transistor protection med low failed OVER is too short to reset 484 Transistor protection med low failed OVER is too short to set 485 Fast transistor protection high failed OVER is too short to reset 486 Fast transistor protection high failed OVER is too long to set 487 Fast transistor protection high failed OVER is too short to set 488 Current Regulation failed at 10mA range too low 489 Current Regulation failed at 100mA range too low 490 Current Regulation failed at 1A range too low 491 Current Regulation failed at 10A range too low Switch pushed down during test 64 Rev Sept 2013 PowerDB Lite User Manual CODE Error Description Possible Cause 498 Charge timeout error Rev 3 Sept 2013 65 Megger 66 AVTMMTO3xx Rev 3 Sept 2013
8. You may have to register to log in on the site Select Software Downloads Select the PowerDB link Download the instruction file and print before any other steps are followed Read the instruction carefully Follow the instructions step by step to assure the process completes fully and successfully At the end of the Update process the unit should be ready for testing Megger AVTMMTO3xx Rev Sept 2013 18 Transformer Testing WARNING When testing a transformer or regulator make sure that good ground is placed on the test specimen as shown on all connection diagrams Winding Resistance Testing Winding resistance measurements in transformers are of fundamental importance for the following purposes Calculations of the IZR component of conductor losses factory test Calculation of winding temperature at the end of a temperature test cycle factory test Asa diagnostic tool for field testing a transformer for assessing possible damage in the field e g additional contact resistance in the current paths from winding to bushing or in the tap changer Transformers are subject to vibration Problems or faults occur due to poor design assembly handing poor environments overloading or poor maintenance Measuring the resistance of the windings and termination resistance assures that the connections are correct and the resistance measurements indicate that there are no severe mismatches or opens Man
9. problem AVTMMTOSxx Rev 3 Sept 2013 24 Transformer Testing Setup Version 06 14 11 1 Check Ethernet configuration Disconnect any wireless connections Connect Communications Check MTO hardware Connection Check MTO power BREAK Current Control Test Mode Transition Sensitivity 20 msec Resistance Time limit for valid reading Stability for valid reading Automatic Data Recording High side H1 H 9900 10 Seconds Save and Close Cancel and Close Reading is within Xn of the previous measurement Check MTO Power Check to make sure the Ethernet wire is connected Disable any wireless connections Check Ethernet configuration Current Amps pull down box fot setting the current test level b Current Transition Sensitivity For detecting a current drop below 90 of the set current level This 15 a pull down item that displays the time it takes before a error occurs 1 Off The hardware will shut down if time exceeds 200milliseconds ii 1 80milliseconds ii 2 40milliseconds iv 3 20 milliseconds v 4 5 milliseconds c Demag This is a pull down item to select the current path for demagnetization H High side H1 H2 recommended for all demagnetization ii X Low side X1 X2 added for special circumstances Rev 3 Sept 2013 25 Megger d Resistance Stability This is a pull down item
10. test set may NIST certified 56 AVTMMTOSxx Rev 3 Sept 2013 PowerDB Lite User Manual Repairs Any service or repair of this equipment should only be performed by qualified persons who are aware of electrical hazards and the necessary precautions required to prevent injury Megget offers a complete Repair and Calibration Service and recommends that its customers take advantage of this service for routine maintenance or in the event of any equipment malfunction In the event that Service is required contact your Megger representative for a product Return Authorization RA number and shipping instructions Ship the product prepaid and insured and marked for the attention of the Megger Repair Department Please indicate all pertinent information including catalog number serial number and problem symptoms Rev 3 Sept 2013 57 Megger ERROR CODES MTO comes with a wide range of error codes to assure unit is working properly and track down problems in a systematic manner When an error code occurs the first thing to do is acknowledge the error by pressing enter and repeating the test If the error persists review the possible causes and determine if you can resolve the problem on site If the basic cause a ruled out contact Megger for additional assistance Bold Error codes are quite common with the possible causes defined CODE Error Description Possible Cause ESD is
11. the MTO300 unit Ethernet Connection This connection links a PC used for control with the NOTE port is not network compatible DO NOT USE ON A LOCAL AREA NETWORK The system was designed for peer to peer operation Earth Ground Lug This connection is used to connect a transformer under test to earth ground for safety The transformer and the MTO shall be at the power ground earth potential when being operated Emergency Shut Down Switch This switch when pushed will disable the source power supply and automatically discharge the transformer The instrument is continuously monitoring this switch in the event of an emergency If the switch is engaged no testing can commence Megger Remote Control Switch This connector is used to interface with a remote switch This switch is primarily used when testing On Load Taps of a transformer The Remote Control Switch can remotely start the MTO test and store multiple resistances reading for tap changes The storage function in remote mode is sequential and occurs during a continuous resistance test MTO330 TOP PANEL FACILITIES Qwerty Keyboard Interface is used to enter field data and control instrument Power Button This button must be used to close down the software before the main power switch is turned off Home Button Toggles Home Action icons Help Button Provides on screen help to assist operator Information Button Provides on screen infor
12. Sept 2013 27 Megger Select Phase Please select what phase of the transformer would like ta test 1 All 2 H1 H2 1 2 3 4 Cancel e The next question will be what row s for the high voltage winding will be tested If the transformer has no taps or the taps are defined as DETC then the software will only allow Selected Row Select the High Voltage Test 5 High Valtage Test Rowe Selected Row First Aow Last Aow f The next question will be what row s for the low voltage winding will be tested If the transformer has taps and the taps are defined as OLTC then the software will allow Selected Row default All Rows or Row Range partial testing Once the winding and rows have been defined press the Test button to continue AVTMMTOSxx Rev 3 Sept 2013 28 Transformer Testing Select the Low Voltage Test 5 Low Valtage Test Rowe Selected Row Nominal All Rows OLTE Only O Row Range DLTC Only First Aow Last Aow 18 Once selected the instrument display module will start This 15 a universal screen used for many transformer configurations At the top is denoted the Transformer configuration the continental standard selected and the nominal current selected for testing the transformer 1phO ANSI Nom Current 10 mA Prev Next Test Test High Voltage Winding Resistance Tes
13. port A standard RJ45 Ethernet cable will work fine for this application Connect the PC Ethernet output to the MTO300 at this time 5 Connect the Remote Control cable optional If the user chooses to operate the MTO from a remote distance then connect the RCC cable at this time 6 Connect the H and X leads to the MTO end only at this time With the clamps disconnected from the UUT connect the H and X cables to the MTO at this time Be sure that all plugs are fastened securely to the MTO so they will not become loose even in the event of the operator inadvertently tripping over the current leads Once the connectors are inserted into the panel a 1 4 turn locking mechanism will secure the connection 7 Connecting to the Transformer When testing high voltage transformers caution must be used at all times and all safety precautions followed Read understand and employ all safety precautions and circuit connections described in Sections 2 Safety and Section 3 Preparing for Test WARNING Ensure that the transformer to be tested is completely AN de energized Check every winding Ensure that all terminals of the transformer are disconnected from line or load at the transformer Connections to ground may be left in place WARNING AN For all testing as described herein care shall be taken to ensure any and all unused clamps be isolated from each other from ground and from personnel At this time make the connections to
14. pushed down Button is pushed down internal cable is disconnected internal hardware failure IntLoc 101 No link between top panel and lower acquisition board 102 Ethernet communication failed Check connection Interlock interface is open MTO210 Interlock Jumper removed attached interlock circuit broken internal cable disconnected Started acquisition before Ethernet link established 110 Current selection switch error 111 Function Mode switch error 112 Storage Mode Switch errors 113 I2C BUS error 114 LCD 12 bus error 115 LED I2C bus error 116 MUX 12 bus error 117 EEPROM failure Initialization error 201 ADC internal zero calibration failure AVTMMTOS3xx Rev Sept 2013 PowerDB Lite User Manual CODE Error Description Possible Cause 202 ADC internal full scale calibration failure 203 Onboard 5 volt supply out of range too high Onboard 10 volt out of range too high Onboard 28 volt out of range too high 206 VICOR power supply temperature is out of range 204 05 2 207 Discharge circuit temperature is out of range 2 5V reference is out of range Zero reference is out of range 25V reference is out of range 211 VICOR power supply failed to regulate at 5 volts 208 209 10 2 212 VICOR power supply failed to regulate at 20 volts 213 VICOR power supply failed to regulate at 40 volts 215 VICOR power supply control loo
15. reference temperature in the transformer test report To estimate the winding temperature at the time of measurement 15 important There are three things needed to get the resistance readings corrected Winding material Winding temperature and corrected to temperature PewerDB Lite Winding Resistance Tester Fie Ed Took sou Segxt De v a LOCATION DATE 6 15 2011 ASSETIO AMBIENT TEMPERATURE F HLIMIDITY JOB TEST EQUIPMENT USED TESTED BY 1 0 MFR WEIGHT Ib CIL VOLUME GAL SER NO WEATHER OIL TEMP C Hy 5Hg X TEAR 1 SEALED CORRECT TO CLASS REASON PHASES 3 Mame 4 ANSI Has Tertiary VOLTAGE WA RATEDT TAPS_ NOMNAL PRIMARY J Form Settings j Instrument Settings Test Wizard F2 Demag Show Manual Tests IN HIGH VOLTAGE WINDING RESISTANCE TT gu Wind 00105 Hos M LOW VOLTAGE WINDING RESISTANCE CIE DERE t x rT MANUAL WINDING RESISTANCE Units _ Ohms Winding Materi al Cu ELS Material Selection In the PowerDB form a material selector for each side of the transformer is available Nameplate section of the form Rev 3 Sept 2013 39 Megger Temperature Entry If the transformer has winding temperature meters use theses readin
16. the firmware on an MTO 300 and 330 ATTAINING THE LATEST SOFTWARE The best way to attain the latest software is to visit Megger com Once you are on the Select the country you are located in You may have to register to log in on the site Select Software Downloads Select MTO There should be a list of software available for download as well as the detailed instructions for performing this task Select the latest firmware version available The software is self contained as a ZIP file Download the file and run A Megget Welcome Screen will appear on the PC display Before moving forward connect the PC to the MTO300 via an Ethernet cable AVTMMTOS3xx Rev 3 Sept 2013 16 Operating the MTO Follow the instructions on the screen or download the detailed instruction set for print The software and instructions will guide you thru a step by step process of selecting the Ethernet Interface veritying that the 15 connected power cycling the MTO to synchronize the boot loader with the PC selecting the file for download and downloading the firmware to the instrument At the end of the process the software should display Successful download The unit will have to be power cycled to exit boot loader mode ATTAINING THE POWERDB SOFTWARE The best way to attain the latest software is to visit Megger com Once you are on the site Rev 3 Sept 2013 Select the country you are located in
17. aly For more information on features of PowerDB use the Help Menu or visit us at our website at www PowerD B coz Rev 3 Sept 2013 91 Megger 7 SAVE THE DATA a Select the F e gt Save menu item or press CTRL S or press the Save toolbar button b The Save As screen will allow you to specify a location and file name for your PowerDB Lite XML file Save In PowerDB File name Save as type PowerDB ML File AVTMMTOSxx Rev 3 Sept 2013 52 Service Using PowerDB OnBoard only Navigating the screen E Arrows keys to highlight desired action Use ENTER key in center to Select highlighted action HOME Screen Action Icons EN Select HOME key to display Action Icons ACTION ICONS Select a Form TRANSFORMERS 56353 M70300 330 WINDING RESISTANCE Show All Forms Additional information to be added when software is released AVTMTO3XX Rev 3 Sept 2013 93 Megger 5 ACQUIRING DATA Follow instructions outlined in Section 5 of the manual 6 COMMENTS AND DEFICIENCIES When imported into the full version of PowerDB the comments and deficiencies on each form are used to generate summary reports These summary reports repeat the notations and lists the page number where reported This allows the user
18. arning and Caution information provided in this manual Treat all terminals of high voltage power equipment systems as potential electric shock hazards Use all practical safety precautions to prevent contact with energized parts of the equipment and related circuits Energy on some terminals of a transformer can easily transfer to other terminals of a transformer When testing thransformers assume all terminals are energized at all times for safety purposes Use suitable barriers barricades and or warnings to keep persons not directly involved with the work away from test activities Never connect the test equipment to energized equipment Do not use in an explosive atmosphere Use the grounding and connection procedures recommended in this manual Always disconnect test leads from power equipment before attempting to disconnect them at the test set The ground connection MUST be the first made and removed last Any interruption of the grounding connection can create an electrical shock hazard Personnel higher than 5 feet should follow proper tie off safety requirements Personnel should use proper safety gear to prevent bodily harm Personnel using heart pacemakers should obtain expert advice on the possible risks before operating this equipment or being close to the equipment during operation Fuse selection is dependent on input voltage 230VAC uses 3 15 amp fuses and 120VAC uses 6 3 amp fuses AVTMMTO3xx Rev 3 Sept 2013 Sa
19. ed on the low voltage side of the transformet Basic sequence of events for a test cycle Start manual start of test b Charging Unit drives the winding with voltage and current until the set current level is reached c Calibration Once the unit is charged and stable the unit will perform and internal calibration to correct for any temperature and offset errors associated with the hardware at the time of test d Measuring Resistance The unit will run continuously measuting resistance and updating the screen The current and resistance readings are undated approximately once pet second i The stability reading is displayed giving the user an understanding of how well the transformer resistance readings have stabilized 100 1s an excellent stability reading After the stability reading has met the Stability valid value for the stability time period the background of the value will turn green i There are two reasons stability readings may be low The first is the software starts the stability value at zero so the user must wait for a specific amount of time time for stable reading to assure AVTMMTOSxx Rev 3 Sept 2013 30 Transformer Testing Rev 3 Sept 2013 the reading 1s valid Customers have the choice of saving and continuing readings without a stable reading Usually this will be after certain amount of time the reading is 99 stable and the customet feels the readings are acce
20. er there ate basically two methods of testing the transformer The first method would be to test the High Side record the information and test the Low Side and record the information This method of testing is beneficial if the high side resistance is much larger than the low side resistance The high side resistance can be tested at 1 amp and the low side resistance can be measured at 10 amps The second method of AVTMMTOSxx Rev 3 Sept 2013 26 Transformer Testing testing would be to measure the high and low side at the same time This 1s the recommended test mode when measuring Low Voltage Delta connections a Two shortcuts are included for seasoned users Right clicking on a specific resistance cell will start a test for that specific cell Right clicking on a specific Row will start a test sequence of three measurements for all three cells in a tow New users should use the test wizard for additional test guidance b Select Test Wizard F2 The first question asked 15 dual current injection or single current injection Select Test Method Dual Winding Current Injection 1 High Voltage amp Low Voltage Single Winding Current Injection 3 High Voltage 4 Low Voltage If dual current injection select 1 and press next d The next question will be what winding s should be tested For single phase transformers 1 All and 2 H1 H2 X1 X2 are the same Select 1 and continue Rev 3
21. er nameplate information The transformer configuration field 15 required This is selectable through the left right arrow on the graphic screen The transformer configuration dictates the test method of the instrument if it is wrong the instrument will not present the result expected can use the arrow keys Tab and Alt Tab as well as a mouse to traverse the header information b MTO330 can use the arrow keys and Tab Alt Tab to traverse the header information Form Setting Button Enter the information for the form Key number is Allowed Error 90 This number is used to highlight winding to winding difference numbers for a three phase transformer when they exceed this defined limit Calculation for difference is Phase 1 Phase 2 Phase 3 3 Average Value 1 error ABS Phase 1 Average Value Ph2 error ABS Phase 2 Average Value Ph3 error ABS Phase 3 Average Value Max Ph error Average Value 100 Difference AVTMMTOSxx Rev 3 Sept 2013 22 Transformer Testing KA PowerDB Lite Winding Resistance Tester File Edit View Tools Help a amp aGixtn MFR WEIGHT Ib OIL VOLUME GAL SER NO WEATHER OIL TEMP C YEAR BIL kV WINDING TEMP C TYPE SEALED IMPEDANCE CORRECT TO 85 C CLASS REASON COOLANT OIL PHASES 3 Has Tertiary M WOLIAGE RATEDI TAPS NOMINAL PRIMARY 5 3 SECOND 1 Instrume
22. esistance Tester Edt View Took deb 5 7 be mmm x EGPT LOCATION DATE 6 15 2011 ASSE I ID AMEENI TEMPERATURE T Y Mo JOB IET EQUIPMENT USED IESTED MFR WEIGHT Ib OL VOLUME GAL SER NO WEATHER OIL TEMP is H ooh Xs YEAR ky TEMP TYPE SEALED MPEDANCE T amp E CLASS REASON COOLANT OL Diagram 4 ANSI First Voltage Last Mp l Form Settings Iristrummerit Settings Test Wizard F 2 HIGH VOLTAGE WINDING STF FdT 1 Volage Last E M Voltage pm NH mate a a MANUAL WINDING RESISTANCE Units nat 5 Press the DEMAG Button ANSI Nom Current 10 A Test Prev Next Test Test 6 Press the START Button 7 The unit automatically cycles thru a preset arrangement of current levels to demagnetize the transformer after all of the resistance testing 15 completed AVTMMTOSxx Rev Sept 2013 38 Transformer Testing 8 The form will have a Demagnetized Transformer printed in the nameplate section of the form to confirm that a Demag was performed as the last operation of the transformer testing Any additional testing of the transformer will clear this message Temperature Correction It may be necessary to convert the resistance measurements to values corresponding to the
23. fety WARNING No user serviceable parts inside Refer all servicing to the factory or a qualified authorized service company CAUTION Use only factory supplied mains cord Mains cord shall not be substituted Input Power Precautions This instrument operates from a single phase sine wave power source It has a three wire power cord and requires a two pole three terminal live neutral and ground type input source The voltage to ground from the live pole of the power source must be within the following rated operating voltage For Cat No MTO3XX 120 230 V 109 single phase sine 48 to 62 Hz The neutral pole must be at ground potential Before making connection to the power source determine that the instrument rating matches the voltage of the power source The power input plug must be inserted only into a mating receptacle with a ground contact WARNING Do not bypass the grounding connection Any interruption of the JN grounding connection can create an electric shock hazard Determine that the receptacle is properly wired before inserting the plug The control circuits of the instrument are protected by two mains circuit fuses These fuses are located in the ON OFF switch module and are replaceable by the operator Please consult the manufacturer for proper replacement fuses to avoid electric shock and fire hazard detailed procedure for Fuse Replacement is defined in Section 7 Service WARNING Before replacing the
24. from many non Megger Instruments Software Installation To install PowerDB Lite load the PowerDB Lite CD into your CD ROM drive and follow the on screen instructions 1 Accept the terms of the License agreement License Agreement Please read the following license agreement carefully Press the PAGE DOWN key to see the rest of the agreement POWER DB INC SOFTWARE LICENSE AGREEMENT THE FOLLOWING TERMS AND CONDITIONS BEFORE INSTALLING THE SOFTWARE IF OLI DO NOT AGREE WITH THEM PROMPTLY RETURN THE SOFTWARE AND THE ACCOMPANYING ITEMS INCLUDING MANUALS POWER DB INC 4064 STATE HIGHWAY SOUTH COLLEGE STATION TERAS 77945 FOR amp REFUND OF THE PRICE PAID Do you accept all the terms of the preceding License Agreement IF you select the setup will clase To install PawerD B must accept this agreement AVTMMTOSxx Rev Sept 2013 44 Service 2 Choose the destination location for the PowerDB Lite files PowerDB InstallShield Wizard _ Choose Destination Location Select folder where setup will install files Setup will install PowerDB in the following folder install to this folder click Next To install to a different folder click Browse and select another folder Destination Folder C Program FilessPowerDB IncPowerD BY Browse lt Back Cancel 3 Select Default Settings Default Settings Language American English Default Units I
25. fuses disconnect the power input plug from the live power source AVTMTO3XX Rev 3 Sept 2013 Megger PC Interface Precautions The MTO300 instrument was designed to operate as a peer to peer connection between a Personal Computer with Windows OS and the Test Unit Unit is NOT designed for network operation DO NOT Connect MTO300 to a network The TCPIP interface selected for MTO is in the limited connectivity AutoIP address range will take approximately 1 minute to auto address the MTO unit For proper unit functionality the registry of the MTO300 interfaced network adapter will be modified with a setting Tcpackfrequency 1 This modification improves the MTO communications speed by approximately a factor of 10 If your corporation does not allow registry for a built in Ethernet port you have one of three options Use the USB to Ethernet adapter provided Order a MTO330 Interface Panel Order a MIO210 Interface Panel The internal server IP address is 168 254 1 1 Subnet Mask 255 255 0 0 MTO330 is a standard PC For network operability it may need to be registered with your IT department AVTMMTO3xx Rev 3 Sept 2013 10 3 Preparing for a Test Site Preparation Choose a location that meets the following conditions The location is as dry as possible There is no flammable material stored in the vicinity The test area is adequately ventilated Be sure all equipment is de energ
26. gs Most transformers will have a meter for each winding Most meters are reading about the same value for a static transformer Use the average of the three readings and place this number in the Winding Temp field of the Transformer nameplate section of the form A secondary method is to use the oil temperature Use this value in the winding temp field and oil temp field of the form Other information The transformer has been out of service for at least hours The temperature of the insulating liquid has stabilized and the difference between the top and bottom temperature does not exceed 5 C If the transformer 15 measured without oil the winding temperature 15 normally assumed to be the same temperature as the surrounding air Once the information and results are in the form the results can be switched from measured resistance to corrected resistance using the checkmark in the transformer nameplate section Conversion of Resistance Measurements Winding resistance measurements are normally converted to a standard reference temperature The conversions are accomplished by the following formula Rs Rm Ts Tk Tm Tk where Rs resistance at desired temperature T s Rm measured resistance Ts desired reference temperature temperature at which resistance was measured Tk 234 5 coppet Tk 225 aluminum AVTMMTOSxx Rev Sept 2013 40 Transformer Testing Manual Mode Operat
27. ion At the bottom of the form is a separate table for manual mode operation It may be required to perform testing that is not typical for a normal test sequence to double check a measurement discrepancy generated in the normal test sequence This manual mode operation creates the ability to test just use single or dual winding measurements with fixed output terminals and virtually unlimited connection opportunities KA PowerDB Lite Winding Resistance Tester File Edit View Tools Help 5 amp m ERI TRAN ORMER WINDING ANCE TESI MFR WEIGHT lb OIL VOLUME COAL SER NO WEATHER OIL TEMP __ YEAR BIL WINDING TEMP SEALED IMPEDANCE 96 CORRECT TO CLASS REASON COOLANT PHASES 3 TRANSFORMER DEMAGNETIZED Diagram 9 ANSI Has Tertiary PRIMARY SECOND 7 p t VOLTAGE TAPS NOMNAL CHANGER TAP SETTING WINDING MATERIAL INCLUDE IN TEST ap ERE MEME MN 4 Form Settings J InstrumentSettings Test Wizard F2 Demag Show Manual Tests HIGH VOLTAGE WINDING RESISTANCE FirstTap Voltage LastTap volage _ Measured Resistance show Graph Current Reading px LOW ETUR WINDING RESISTANCE FirstTap Voltage LasTap volage Measured Resistance Show Graph Units Ohms _ Current Reading Winding
28. ized and all terminals of the Unit Under Test UUT are accessible Erect suitable safety barriers to protect the operator from traffic hazards and to prevent intrusion by unauthorized personnel User provided Warning lights are recommended Verify that the Local station ground is intact and has impedance continuity to earth Making Circuit Connections Connections should be made in the order as listed below AVTMMTO3XX Rev 3 Sept 2013 1 Ground Use the Megger supplied Safety Ground Cable 15 ft 4 6 to connect the MTO Wing Nut Ground Terminal directly to Local Station Earth Ground Ensure that the Transformer chassis also has a low impedance connection to Local Station Earth ground potential 2 Input Power Source Ground Input Power Source Ground Terminal should be less than 100 milliohms of impedance to Local Station Earth Ground 3 Connect the Input Power Cord Before making this connection insure the Input Power Source meets the requirements as listed in Section 2 Safety and the specifications as listed in the datasheet Also make sure that the ON OFF switch Figure 1 is in the OFF position Connect the input power cable to the MTO first then to the power source At this time leave the ON OFF switch in the OFF position 11 Megger 4 Connect the Ethernet Cable If using a remote PC and PowerDB Lite software connect the Ethernet cable from the MTO330 side panel or the MTO300 front panel to the PC Ethernet
29. mation to assist operator Page Up Button Large forms may have multiple pages of results This button is used to toggle up the page sequence AVTMMTO3xx Rev 3 Sept 2013 Getting to Know the MTO dit Rev 3 Sept 2013 Page Down Button Large forms may have multiple pages of results This button is used to toggle down the page sequence Test Button Initiates and Terminates Testing Tab Button Allows user to select active area of screen Home Button Toggles HOME action icons Use Arrow keys to highlight a desired selection Use the Enter button in center to Activate the selection Ethernet Interface Used for linking a PC to the top panel for instrument control USB Interface Used for software updates data transfer and printer output Megger HOME Action Icons B Select to create NEW test Select to RECALL test e Select to SAVE Test Select to ZOOM IN Select to ZOOM OUT Print Icon Prints the Selected Test Form Printer driver is factory installed Please E contact Megger for specific printer model availability Select to enter PREFERENCES screen Figure 3 HOME Action Icons AVTMMTOSxx Rev 3 Sept 2013 2 Safety Safety is the responsibility of the user Only qualified and trained operators should operate the MTO system Operator must read and understand this entire Instruction Manual prior to operating the equipment Operator must follow the i
30. mperial lt Back Rev 3 Sept 2013 45 4 InstallShield Wizard will complete the installation of PowerDB Lite Click Finish to close the installation program PowerDB InstallShield Wizard InstallShield Wizard Complete Setup has finished installing PowerDB on your computer AVTMMTOSxx Rev 3 Sept 2013 46 Service Using PowerDB Lite 1 SELECTING AN INSTRUMENT 1 Select your Instrument from the Instrument Setup screen a You always view the Instrument Setup screen from the Tools menu Select Instrument Insulation Transformers Battery Breaker 51 5005 BM 25 TTA 550503 BITE MEG 10 BITES ODEN MCT 1TBxx TURKEL Oil 51 552 HEE MTO 210 51 1052 PULSAR 5 51 1054 2 51 554 Earth Power Factor DET ux DELTA 2000 51 5010 d i MIT S20 DELTA 3000 MIT 1020 DELTA 4000 1505 ETN 20 EET BEEN HEN NUN ii i Select the Instrument ta begin testing For technical support call 1 214 333 3201 1 800 723 2851 3513 ar 44 1304 502102 Open Existing Results File b The MTO3XX uses Ethernet communication there is not need for communications setup Rev 3 Sept 2013 47 Megger instrument Configuration Instrument Use Manufact
31. nstructions of this Instruction Manual and attend the equipment while the equipment is use In the event of equipment malfunction the unit should immediately be de energized and returned to Megget for repair The Safety precautions herein are not intended to replace your Company s Safety Procedures Refer to e g IEEE 62 1995 TEEE C57 152 and IEEE 510 1983 IEEE Recommended Practices for Safety in High Voltage and High Power Testing for additional information WARNING When applying current to a transformer with very high inductance care should be taken not to remove current voltage JN leads while DC current is still flowing This causes an extremely high voltage to develop across the point where current is broken This voltage could prove to be dangerous to personnel and equipment WARNING It is very important not change De Energized Tap Changers while current is still flowing This cause excessive voltage arcs within the transformer and on external terminals AVTMMTOSXX Rev 3 Sept 2013 Megger General Safety Precautions The MTO and the Unit Under Test UUT should both be considered as sources of instantaneously lethal levels of electrical energy Observe the following safety precautions Observe all safety warnings on the equipment They identify areas of immediate hazard that could result in injury or death Use this equipment only for the purposes described in this manual Observe strictly the W
32. nt Settings Test Wizard F2 Demag Y Show Voltage HIGH VOLTAGE WINDING RESISTANCE First Tap 1 Last 5 Voltage Show Graph Reading Stability LOW VOLTAGE WINDING RESISTANCE Measured Resistance Last 1 Voltage Show Graph Current Reading TAP amp Voltage Stability 4 l gt MTOP refs Form Settings show Diag Number Standart Allowed Error a 16 Instrument Settings Button Setup the MTO for the testing methodology of the instrument Rev 3 Sept 2013 23 Megger MIO Setup Version 06 14 11 1 Serial Number 1097 Firmware Version 307 Communications Calibration Date BREAK MAKE Current Control Test Mode Transition Sensitivity 20 msec Resistance Time limit for valid reading Automatic Data Recording Stability for FEMME valid reading High side H1 H 9900 10 Seconds Save and Close Cancel and Close Communications with the is working a The Title Bar for this window displays the program title MTO Setup and the version number of the program b Communications button Indicates that the is connected and communicating with the top panel MTO330 or PC MTO300 i Green flashing and display of instrument serial number firmware and calibration date indicate proper operation 11 Red with no information means there is a communications
33. onnel Please consult the manufacturer for proper replacement fuses to avoid electric shock and fire hazard Note that 2 spare fuses are included with each MTO AVTMMTOSXX Rev 3 Sept 2013 55 Megger WARNING Before replacing the fuses disconnect the power input plug from the live power source To replace fuse s proceed as follows 1 2 Calibration Disconnect the power cord from the MTO test set Using a small flathead screwdriver carefully remove the fuse holder of the input power module installed on the right side of the MTO test set front panel Remove and properly dispose of blown fuse s Install new fuse s making sure to use the type specified by the manufacturer Reinstall the fuse holder in its receptacle in the input power module Connect the power cord to the test set and to an energized power soutce If the electronic circuits still do not function properly contact the factory for service Extender for J Series or others Optional filter A complete performance and calibration check should be made at least once every year This will ensure that the MTO test set is functioning and calibrated properly over the entire measurement range The MTO calibration is performed on each new or repaired unit before sending it to a customer There 15 a special MTO final calibration procedure which requires a NIST traceable test equipment to be used As a result of such calibration procedure each
34. other expendable items where the original manufacturer s warranty shall apply We make no other warranty The warranty 15 vold in the event of abuse failure to follow recommended operating procedures or failure by the customer to perform specific maintenance as indicated in this manual Megger Valley Forge Corporate Center 2621 Van Buren Ave Norristown 19403 2329 610 676 8500 Telephone 610 676 8610 Fax WW HIgger conm Table of Contents Ree BE Oe rod eios dares mem m 1 6505 00 9 9 1 Top 2 i VAN OY ess a n 7 Datetydssthe re Pons DIOE NE USC Ob Men terre Sorcerer tee terre 7 Prec aa SEEST ter reece 8 Input Power ONS 9 Ce S Premion 10 D Les LM rey 11 REE O UO 11 Circuit Meena nuuc 11 oss the NET se donc d 13 teehee e Me 13 Transtortiet
35. p circuit failed 216 Too much voltage ripple for the 5 volt supply 217 Too much voltage ripple for the 10 volt supply 218 Too much voltage ripple for the 28 volt supply 221 Too much voltage ripple for the 2 5 volt reference Rev 3 Sept 2013 59 Megger CODE Error Description Possible Cause 222 Too much voltage ripple for the 25 volt reference 223 Too much voltage ripple for the VICOR power supply at 5 volts 224 Too much voltage ripple for the VICOR power supply at 20 volts 225 Too much voltage ripple for the VICOR power supply at 40 volts fT a fT ea DIC if 226 27 VICOR power supply failed at 5 voltage too high VICOR power supply failed at 5v voltage too low VICOR power supply failed at 20v voltage too high 237 VICOR power supply failed at 20v voltage too low VICOR power supply failed at 40 voltage too high VICOR power supply failed at 40 voltage too low VICOR power supply failed at loop test 60 AVTMMTOS3xx Rev Sept 2013 PowerDB Lite User Manual CODE Error Description Possible Cause voltage too low Onboard 10v out of range voltage too low Onboard 28v out of range voltage too low 241 42 2 Discharge temperature is out of range too Unit overheated fans filters clogged fans high not working overuse extremely ho
36. ptable If the Save Results button is pushed immediately after starting a test then data could be saved with low stability numbers The second thing that causes stability readings to become low 15 measuring low resistance readings with low current levels The input signals for the instrument will be so low that the reading fluctuate at a larger percentage of the reading level To help resolve this issue test at the highest possible current level For very low resistances change the stability time duration to 180 seconds This will average mote measurements together and effectively reduce the noise level for really low measurement values Save Results When the uset has the readings he accepts as valid he can press the Save Results Button and the data Finish Shuts down the Measurement software and transfers all data back to PowerDB 31 Megger Testing a Three Phase Transformer Below is an outline of the test sequence 1 Three Phase Wye Configured Winding with Neutral TEST 1 Current flows from H1 to HO Voltage readings H1 HO TEST 2 Current flows from H2 to HO Voltage readings 2 Hs TEST 3 Current flows from H3 to HO HO Voltage readings H3 HO e 2 0 0 gt 9 Figure 6 YN reading sequence AVTMMTOS3xx Rev 3 Sept 2013 32 Transformer Testing 2 Three Phase Wye Configured Winding No Neutral Brought Out TEST 1 Current flows from H1 to H2 Voltage reading
37. ressing will cause stable result to be saved to memory The Remote Indicator will flash quickly 6 times L O L O second cycle STATE 4 Transition monitoring phase After a save the MTO screen will present a message requesting the user to change the At this point the transition monitoring circuit 15 activated The Remote Megger Indicator will flash quickly 3 time and pause three times L 0 L 0 L 0 0 0 0 0 0 0 L 0 L O L 0 14 sec cycle 10 User should change the 11 If the current transition detection occurs the unit goes into STATE 5 5ms 20ms 40ms 80ms and the Remote Indicator will flash rapidly L O L O sec interval continuously The user can go back to the User interface for repeat of test or can press the remote button save the event and start reading the resistance of the next tap 12 If a 200 milli seconds current transition detection has occurred Discharge State will be initiated Remote Indicator will flash slowly until a discharge has occurred The Remote Indicator will slow flash once per second ON OFF ON OFF to indicate discharging 13 Press to record the reading again and the process continues until all transformer taps are tested FIRMWARE UPDATE MODE The MTO3XX has an internal processor with associated firmware From time to time Megger changes this firmware for operational improvements or added features This section describes the method for changing
38. s will speed the test up by a factor of 10 or more DELTA WINDING RESISTANCE Manufacturer s winding resistance data are usually presented as per winding for Y configurations and per terminal pairs for Delta windings In the rare case that manufacturer s data is presented per winding also for a delta connection the recommendation is to recalculate the numbers to terminal pairs and compare with the field measurement results Ravg Average individual winding resistance Rtp Winding resistance between terminal pairs Rtp Rave 0 6667 Rev 3 Sept 2013 35 Megger TESTING TRANSFORMERS WITH TAP CHANGERS WARNING Make sure before changing taps to identify the types of tap changers on the transformer and test accordingly per instructions Many transformers used today have taps built into them These taps allow ratio to be increased or decreased by a few percent Any of the ratio changes involve a mechanical movement of a contact from one position to another It is this contact that needs to be checked by way of its contact resistance and mechanical integrity The contact may go bad for a number of reasons 1 Misaligned when manufactured causing insufficient surface contact Full load current overheats contact surface causing it to burn 2 Current passing through contact exceeds full load rating 3 Tap changing operation failing to have the required Make Before Break sequence will crea
39. strument and enables the appropriate form s Data can be entered on screen captured directly while using the test instrument Completed data forms can be saved as files to your computer For more information or updates to the software visit www PowerDB com Minimum Recommended System Operating System Windows 2000 or later RAM 64 MB RAM minimum 512 RAM recommended Processor 300 MHz Pentium Class processor minimum 1 GHZ better recommended For information about the features of the full version of PowerDB please visit out website at www powerdb com Get acquainted with the following features by scheduling a live demonstration at zzfo powerdb com Synchronize all of your test records into a Single Corporate Database Reduce Test Time Improve Data Integrity Standardize Test Procedures Easily use Historical Trending for evaluation of Test Results AVTMMTOSXX Rev 3 Sept 2013 43 Megger Eliminates the need to install and maintain a software application per instrument Eliminates all hand written test sheets Create your own test forms Use or modify one of our 200 built in test forms procedure to generate test reports with table of contents and deficiency summaries Allows all of your field test data to be integrated with CMMS systems such as Maximo SAP Imports gt From Many Other Industry Standard Software Applications Controls and Imports Data
40. system will display what cycle the unit 15 processing Primary H leads need to be the only leads attached for effective demagnetization NOTE demagnetization cycle will take some time for completion It is equivalent to taking multiple tests in sequence AVTMMTO3xx Rev 3 Sept 2013 14 Operating the MTO REMOTE TEST FUNCTION The main purpose of this function is to take sequential data to stotage during single test It is useful for tap change testing where multiple resistance values are read in sequence with no interruption in current flow Rev 3 Sept 2013 Connect Remote Control Cable to the remote connector on the front panel of the instrument Power ON the instrument Start PowerDB software and follow the standard transformer setup procedures Once the MTO3XX control software is displayed the remote button will be automatically detected and the test button on the screen will display ACTIVE STATE 1 ready condition Indicator will be off The operator will go to the tap changer verify it is in the correct STATE 2 Transformer Charging and or Stabilizing The Remote Indicator will slow flash once per second ON OFF ON OFF to indicate charging starting position and then to start the first test press STATE 3 Stable Reading measurement mode When the Remote Indicator goes steady L L L L the reading is stable Y Stability and X timeframe P
41. t Measured Resistance I Stability es alaf Low Voltage Winding Resistance Test ma Measured Resistance Stability 90 Break Rev 3 Sept 2013 29 Megger T9 20 21 22 29 24 29 26 2 28 The software will not automatically start testing as safety precaution two step process is required to energize the test specimen Additionally Instrument Test Setup can be quickly accessed from this screen in the event you want to check change any settings before starting a test Prev Test Gives the user the ability to go back only one step in a sequence of steps that are run This function will primarily be used during OLTC tap changer operation Start Manual Start of Test Button will change status as test sequence continues Next Test Gives the user the ability to skip forward one step in a sequence of steps that are run Exit Before and After testing the user has the ability to exit the software without saving data MESSAGE WINDOW Grey area under the function buttons This window will constantly flash YELLOW defining the state of the machine as it is operating High Voltage Winding Resistance display area for all information measured on the high voltage side of the transformer Low Voltage Winding Resistance display area for all information measur
42. t is recommended that the user becomes familiar with the MTO before making any connection to a transformer AVTMMTOSXX Rev 3 Sept 2013 Megger Top Panel Controls Figure 1 Front Panel Figure 2 MTO330 Front Panel AVTMMTOS3xx Rev Sept 2013 Getting to Know the MTO A 120 230 V 50 60 Hz H A ease x Rev 3 Sept 2013 720 MAX Input AC Power Module This module is an IEC320 interface to the mains power The module has an integrated switch fuse holder and input filter module Above the module are the voltage frequency and power requirements for the product Below the module are the fuse type and ratings based on the input voltage used The green light on the right side of the module illuminates when power is ON position 1 ON position Primary Interface connection from the transformer to the unit This connection has all of the interfaces required to connect current and voltage inputs from a three phase transformer into the MTO300 unit Discharge Indicator blinks every 12 second when a transformer is discharging Test Indicator stays on when a transformer is energized Secondary Tertiary Interface connection from the transformer to the unit This connection has all of the interfaces required to connect current and voltage inputs from a three phase transformer into
43. t test conditions VICOR temperature is out of range too Unit overheated fans filters clogged fans high not working overuse extremely hot test conditions 302 Internal error Communication with ADC 245 246 301 failed ADC sample rate setting failed ADC internal zero cal failed ADC internal full scale calibration failed 303 304 305 306 ADC cannot be restored back to normal mode ADC failed initialization ADC failed run time AVTMTO3XX Rev 3 Sept 2013 307 308 309 310 311 12 3 61 Megger CODE Possible Cause 402 VICOR protection failed OVER is too long or too short to reset 403 VICOR protection failed OVER is too long or too short to set 404 VICOR fast protection failed OVER is too long or too short to reset 405 VICOR fast protection failed OVER is too long or too short to set 406 Current Regulation failed at DAC 0 07 Current Regulation failed at 10mA range 62 AVTMMTOS3xx Rev 3 Sept 2013 4 4 4 08 09 10 PowerDB Lite User Manual CODE Possible Cause 465 OVER and UNDER failed during winding resistance test 466 Current calibration failed during winding resistance test 467 Voltage calibration failed during winding resistance test 468 Received abort signal 469 System zero cal failed during current regulation 470 Nocurrent setting has been set for current control
44. te information 3 Starting the test 4 Data Display 5 Stopping the test 6 Populating the PowerDB table 7 Saving the data AUTOMATIC DISCHARGE FUNCTION Discharge of a transformer after testing is critical to prevent excessive voltage buildup across the transformer bushings upon removal of leads When any current source is disconnected from a transformer the energy in a transformer will continue to flow If there 15 high impedance air 1n the nature current loop the voltage across the inductor will increase until there 1s a current path found for the energy The MTO3XX has discharge circuitry built in It will automatically initiate when the current source is disconnected from the transformer It will also provide visual indication of discharging on the front panel and the PC screen DEMAGNETIZATION FUNCTION The demagnetization of a transformer after DC winding resistance testing is recommended This will ensure smooth startup and consistent diagnostic results If not performed there may be a residual flux present in the transformer at startup Inrush currents on the primary side of the transformer may exceed telay settings for shutdown Demagnetization is also recommended before performing SERA and excitation current measurements MTO demagnetizes the transformer by automatically magnetizing the core of the transformer in the positive and negative direction with multiple cycles of reduced current During demagnetization the
45. te internal arcing of contact surface 4 An off load tap changer is switched while on load Contact surface becomes pitted and uneven Tap changers are divided into two types On load DeEnergized Tap Changer and Off load On Load Tap Changer The OLTC tap changer allows selection of ratio change while the transformer is in service This would mean the ratio of a transformer can be changed while power current is still passing through it The most common example of this type of OLTC tap changer is a Voltage Regulator The MTO is designed to test both DETC s and OLTC s For DETC taps the software will direct the user to discharge the transformer before changing taps This will help assure the transformer equipment and user to not get damaged inadvertently For OLTC s the software has three methods of testing The first 15 testing the taps in the same manner as a DETC one tap at a time stopping and filling in the form after each test All of the TAPS can be tested in sequence from 1 to 33 and then transferred to PowerDB form and the last method is selecting a specific range of taps for testing if all taps are not required for testing AVTMMTOSxx Rev Sept 2013 36 Transformer Testing Because the instrument can be left on while changing from tap to tap it is possible to take measurements without discharging The MTO will re balance after every tap change If the current drops more than 10 for the selected
46. the Transformer Under Test TUT as described in the applicable section of Section 5 Connecting to the Transformer Under Test AVTMMTOSxx Rev 3 Sept 2013 12 4 Operating the MTO300 330 When testing high voltage transformers caution must be used at all times and all safety precautions followed Read understand and employ all safety precautions and circuit connections described in Section 2 Safety and Section 3 Preparing for Test WARNING Ensure that the transformer to be tested is completely de energized Check every winding Ensure that all terminals of the transformer are disconnected from line or load at the transformer Connections to ground may be left in place WARNING For all testing as described herein care shall be taken to ensure any and all unused clamps shall be isolated from each other from ground and from personnel gt EMERGENCY SHUTDOWN PROCEDURE AN Press red EMERGENCY TEST OFF push button or switch power off Description of Test Sequence Once all the precautions and steps of Sections 2 Safety and 3 Prepare for Test are complete and the connections to the Transformer Under Test TUT have been made then the input switch may be switched to the ON position A 120 230 V 50 60 Hz 720 MAX O OFF position 1 ON position AVTMMTOSXX Rev 3 Sept 2013 Megger TEST FUNCTION 1 Entering the test report information 2 Entering the transformer namepla
47. to append new set of results to the file To remove a set of results click on the selected file and press the button Look in amp iPh ANSI Pdbxml ANSLPdbxm IEC Pdbsml 1 IEC Pdbsml 1096 ANSI Pdbxml 1ph AMSI Pdbxm 8096 IEC Pdbxml Dy5_ANSI Pdb rnl 1ph amp IEC Pdbxml amp Bde IEC Pdbiml amp Dys IEC Pdbxml amp Dpda ANMSLPdbxm e Dbdin Dy7 ANSI Pdbxmi 040 IEC Pdb ral l Dyl amp Dy7 IEC Pdbxml gt File name Files of type PowerDB File Pdi Cancel Open as read only AVTMMTOSxx Rev 3 Sept 2013 50 Service Open PowerDB XML file Form name 56353 MTO 300 330 WINDING RESISTANCE view or edit a set of results Test Date select a test date and press the 2011 233 79 PM button ames To remove a set of results select test date and press the Delete button Fress the New button to enter another set of test results 5 ACQUIRING DATA Follow instructions outlined in section 5 of the manual 6 COMMENTS AND DEFICIENCIES When imported into the full version of PowerDB the comments deficiencies on each form are used to generate summary reports These summary reports repeat the notations and lists the page number where reported This allows the user to scroll to a particular page to view a reported anom
48. to scroll to a particular page to view a reported anomaly For more information on features of PowerDB use the Help Menu or visit us at our website at www coz AVTMMTOSxx Rev 3 Sept 2013 54 7 Maintenance Maintenance should be performed only by qualified persons familiar with the hazards involved with high voltage test equipment Read and understand Section 2 Safety before performing any service Routine maintenance 1s required the MTO test set The appearance of the MTO test set can be maintained by occasionally cleaning the case panel and cable assemblies 1 Clean the outside of the carrying case with detergent and water Dry with a clean dry cloth 2 Clean the control panel with a cloth dampened with detergent and water Do NOT allow water to penetrate panel holes because damage to components on the underside may result An all purpose household spray cleaner can be used to clean the panel Polish with a soft dry cloth taking care not to scratch the display screen cover 3 Clean the cables and mating panel receptacles with isopropyl denatured alcohol applied with a clean cloth 4 Inspect the cable assemblies occasionally to ensure they are in good condition Fuse Replacement The electronic circuits in the MTO test set are protected by two mains fuses Fuse replacement is indicated if the electronic circuits do not function Refer any fuse replacement to qualified pers
49. to select the level for acceptable resistance reading stability from one period of time average data for 1 to 5 seconds vs a second period of time average data for 6 to 10 seconds io 2994 iis 99596 HL 09 550 iv 99 8257 NOTE Due to the nature of this measurement the user will have to wait during the acquisition cycle for a minimum of the time period specified to assure good stability numbers Software will start at zero and work toward 100 stability with time and stable measurements e Resistance Time Limit for valid reading This is a pull down item to select the amount of time before a reading is verified as stable 10 seconds was used in the stability reading example For large transformers it may be necessary to extend the period to assure stable readings Extending the Time Limit will also increase the averaging routine improving low value readings i 10 seconds ii 20 seconds iii 40 seconds iv 80 seconds v 180 seconds f Saveand Close button to accept and exit Instrument Setup Canceland Close button to cancel and exit Instrument Setup h Status Window Much clearer description of sections on the screen for those of you who do not like reading manuals 17 Testing the transformer requires the user to decide a method of testing To simplify this process PowerDB has included a Test Wizard to assure the customer understands the testing method to choose For a single winding transform
50. transition time sensitivity then the MTO will indicate there Was a transition The transition times are set to 5ms 20ms 80ms and Off If a transition is detected over 5 msec and under 200 msecs the unit will flag a transition but the current will continue flowing The same thing goes for 20 and 80 millisecond settings If a transition is detected the unit will define the transition test time and the pass or fail test result If the current interruption 15 longer than about 200 ms the MTO will stop the test and discharge the transformer automatically Demagnetizing a Transformer The MTO demagnetizes the transformer by automatically magnetizing the core of the transformer in the positive and negative direction with multiple cycles of reduced current The demagnetization function is equivalent to generating test currents for multiple resistance tests During the demagnetizations cycle the unit will display the number of cycles left in the process 1 Rev 3 Sept 2013 Demagnetization only needs to be accomplished once after all testing is complete Test leads should be attached to one terminal pair on high side Primary windings for effective demagnetization eg H1 H2 is the standard terminal connection that the MTO will drive current through Only one terminal pair winding needs to be demagnetized on a three phase transformer Press the DEMAG Button 3 Megger RT PewerDB Lite Winding R
51. urer Model Type Series Supported Models Model winding Resistance Tester MTO 210 MTO 300 MTO 330 MTO 300 Serial Port Byte Size Baud Rate Device Manager Parity Stop Bits Note that USE serial ports can be identified by viewing the serial port list plugging in the USB port and then hitting the Refresh button The USE part will be the only new item in the list Cancel c Click OK on the Instrument Setup Screen to finish AVTMMTOSxx Rev 3 Sept 2013 48 Service 2 SELECTING A FORM Once you have defined the instrument PowerDB will present the forms created in the database and associated with that instrument The factory default form 15 56352 Select Form Show All Forms 3 ENTER HEADER AND NAMEPLATE DATA a Header and nameplate information can be manually typed into a form b Header and nameplate information can be automatically loaded into a form by opening an existing form the unit and selecting NEW Rev 3 Sept 2013 49 Megger 4 OPENING AN EXISTING FILE Select the F e gt Open menu item File name pdb Files of type PowerDB XML File Cancel as read only b Browse to the file you would like to open Press the Open dialog button d If the file contains multiple test dates select the Daz that you would like to open for editing or select New
52. werDB program For detailed information on PowerD B please refer to the user manual and additionally the Help Screen for the software The Help screen and manuals will stay more up to date than this manual 9 MTO300 and PowerDB Lite Select the instrument MTO300 from the instrument setup screen Rev 3 Sept 2013 21 Megger 10 11 12 14 15 MTO300 Select the form desired for use This manual employs form number 56353 M TO300 330 Winding Resistance The form will be displayed and the user will be ready to start the process Selecting an existing form this 15 handy for customers that have a form and transformer configuration they are using on a regular basis a File Open or the file folder icon will give you the list of forms on the machine Select the template form and press enter b MTO330 Use Home screen Action Icons to select various functions including Preferences Open Save New Print Enter all of the header information with pertinent information For users not using PowerDB for asset management there is a button to show header information click on it and the header will not appear on the form a can use the arrow keys Tab and Alt Tab as well as a mouse to traverse the header information b MTO330 can use the arrow keys and Tab Alt Tab to traverse the header information Enter the transform
53. y transformers have taps built into them These taps allow ratio to be increased or decreased by fractions of a percent Any of the ratio changes involve a mechanical movement of a contact from one position to another These tap changes should also be checked during a winding resistance test AVTMMTOSXX Rev 3 Sept 2013 19 Megger Testing a Single Phase Transformer Below are some graphics on the three methods of testing a single winding transformer SINGLE WINDING TEST H1 gt e 8 X1 e lt Figure 4 Single Winding Measurement Primary or Secondary AVTMMTOS3xx Rev 3 Sept 2013 20 Transformer Testing H1 e TRANSFORMER Figure 5 Dual Winding Measurement Primary and Secondary WARNING Do not disconnect leads until all indicators are OFF PROCEDURE 1 Connect line to unit and plug into 120 V 230 V socket 2 Connect Safety GND cord from Top Panel to Transformer GND 3 Connect Ethernet cable between PC and MTO300 4 Connect and or X lead set to the MTO3XX 5 Connect the and or X lead set to the Transformer as shown in above figures Turn the MTO300 power switch ON 7 Turn the PC power 8 MTO300 Start the Po
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