Step Contact Voltage Measuring System
Contents
1. Selecting this option will allow to upload different data from the Station to the Meter and vice versa Options are Q Synchronization of date time and STEF CONTHCT VOLT Current EARTH FESULTS a Uploading of test current results for Step Contact voltage calculation a Uploading of earth resistance results Figure 5 8 Synchronization menu Cursor UP DOWN Selects option TEST Enters selected option Returns to Settings main menu oynchronized data TIME CURRENT Station s time and date will be uploaded to the Meter Value of generator current will be uploaded to the Meter if current generator is on STEP CONTACT Values of logged generator currents Icen will be uploaded to the Meter for VOLT calculation of Step voltage or Contact voltage EARTH RESULTS Stored Earth resistance results in the Station will be uploaded to the Meter 18 MI 3295 Step Contact Voltage Measuring System MI 3295M Meter operation Note L The main purpose of the Time Current synchronization is to enable a correction of the step and contact voltage results after the test During the test the step and contact voltage results are calculated on base on the set Iser in the Meter After the test the results made with the Meter can be updated with the real generator currents lagy that were measured at the same time with the Station The stored Ustep and Ucontact values are then corrected according to the following formula2. Step Contact Voltage Measuring System MI 3295 Instruction manual Version 1 2 Code no 20 751 785 RA Zp METREL Distributor Manufacturer METREL d d Ljubljanska cesta 77 1354 Horjul Slovenia web site http www metrel si e mail metrel metrel si 2010 METREL The trade names Metrel Smartec Eurotest Autosequence are trademarks registered or pending in Europe and other countries No part of this publication may be reproduced or utilized in any form or by any means without permission in writing from METREL MI 3295 Step Contact Voltage Measuring System Table of contents Table of content 1 v 5 r o DM 5 2 Safety and operational considerations eeeeeeeee eene nee 6 2 NVARAIMNGS ANG MOLES be ie EO orb eH UP ple EH DR IR USE ue 6 2 2 Battery and charging of MI 3299 6 2 2 1 New battery cells or cells unused for a longer period eee eee 8 2 3 Otandards aDpDIIGQ esser esie ee Deed iix baie rai eina iab tae ia vai esae vmi evi er Viae eric i e ed basin 8 3 Instrument description MI 3295M Meter eere 10 SM NEMER onera EE D TUE A 10 ort 7169 216 eaer ci MR IU I OL TS TTD 11 S MEME I TU m 11 4 Instrument description MI 3295S Station eere eere 13 4d JIODnbDSelsussisentsteuscitin S MR tats otis fait hit essa ee peo ntn so D oM Oda II deh oasia etcalay 13 4 2 Instrume
3. U U I GEN actually _ generated STEPnew STEPold qo SET U U Icen actually _ generated CONTnew CONTold qo T SET The synchronization is active for 24 h If the date time are changed at the Meter or the Station the synchronization of time and data will be lost The Current logger must be cleared before it can be proceeded with the measurements Before clearing it the content can be downloaded to the Meter If there is no synchronization between both units the H icon is displayed in the Meter measuring screen 19 MI 3295 Step Contact Voltage Measuring System MI 3295S Station operation 6 MI 3295S Station operation 6 1 Organization of displays Function name R 0 305 Result amp Sub result field Rice Ai RP B Figure 6 1 Typical display in earth resistance function Message field CURRENT GEM EEE Function name Result field um M fiel Figure 6 2 Typical display in Z eat current function aU Remained place in current logger 6 2 Warnings and messages Before and during the measurement the instrument performs different tests to ensure safety and to prevent from damaging it These safety tests includes checking for any external voltage or improper loading of test terminals If a problem is detected an appropriate warning message will be displayed Warnings and protective measures are described in this chapter CURRENT GEM GG 31 Voltage between test terminal
4. batteries a Use only power supply adapter delivered from the manufacturer or distributor of the test equipment to avoid possible fire or electric shock MI 3295 Step Contact Voltage Measuring System Safety and operational considerations 2 2 1 New battery cells or cells unused for a longer period Unpredictable chemical processes can occur during charging of new battery cells or cells that were unused for a longer period more than 3 months NiMH and NiCd battery cells are affected to capacity degradation sometimes called as memory effect As a result the instrument operation time can be significantly reduced Recommended procedure for recovering battery cells Procedure Notes gt Completely charge the battery At least 14 h with in built charger Use the instrument for normal testing until gt Completely discharge the battery the unit displays the Bat symbol on screen gt Repeat the charge discharge cycle for Four cycles are recommended at least twice Complete discharge charge cycle can be performed automatically for each cell using external intelligent battery charger Notes a The charger in the instrument is a pack cell charger This means that the battery cells are connected in series during the charging The battery cells have to be equivalent same charge condition same type and age a One different battery cell can cause an improper charging and incorrect discharging during normal usage of the entire ba
5. V battery or accu size AA ODGFallOLE roter ee bs Poet vi a radii t typical 12h Charger socket input voltage 12 V 10 96 Charger socket input current 400 mA max Battery charging current 250 mA internally regulated Measuring category sss CAT IV 50 V Protection classification double insulation Pollution degree 2 Degree of protection IP 40 Ke AER 128 x 64 dots matrix display with backlight MICIMORY MEER 1500 memory locations Communication interface 89232 USB Dimensions wxhxdq 23 cm x 10 3 cm x 11 5 cm VV GIGI e 1 3 kg with batteries 39 MI 3295 Step Contact Voltage Measuring System Technical specifications Environmental conditions Reference temperature range 10 C 30 C Reference humidity range 35 65 RH Operation conditions Working temperature range 0 C 40 C Maximum relative humidity 85 RH 0 C 40 C non condensing Storage conditions Temperature range 10 C 60 C Maximum relative humidity 90 RH 10 C 40 C 80 RH 40 C 60 C Accuracies apply for 1 year in reference conditions Temperature coefficient outside these lim
6. Voltage Measuring System MI 3295M Meter operation 5 4 1 Language ELECT LANGUAGE Language can be set in the SELECT SLOVENSK LANGUAGE menu ESPANOL i Figure 5 4 Language selection Keys Cursor UP DOWN Selects language TEST Confirms selected language Returns to Settings main menu 5 4 2 Help screens The help screens contain basic schematic connection diagrams and information about p ST zi the instrument E ep TERT _ Figure 5 5 Example of help screen Keys Cursor LEFT RIGHT Selects next previous help screen Returns to Settings main menu 5 4 3 Initial settings The instrument settings and measurement parameters and limits can be set to their initial factory settings in this menu VE aS VES Figure 5 6 Initial settings screen Cursor LEFT RIGHT Selects Yes or No TEST Restores initial settings if Yes is selected Exits back to Settings main menu without changes Initial settings are Instrument setting Default value Default value English 17 MI 3295 Step Contact Voltage Measuring System MI 3295M Meter operation Parameters limit value Contact Voltage Iser 10A lFAu T7 1 kA Rinput 1 MO Uiiur 50 V Step Voltage lser 10A lFaur 1 kA Rinput 1 MO Uiiur 50 V 5 4 4 Date and time Date and time can be set in this menu SET DATE TIME 12 88 PH BES 81 28688 Figure 5 7 Setting date and time Keys 5 4 5 Synchronization
7. acon taque a Capstes nen des chou tabs quud qu vae cedat ue eu Ue unquae 32 Oo 1 4 Clearmg stored da ceci ici cease eieieidec uds a e todemu acea ade ta ri a aee dre 33 eZ A GU ae A ETa e DM 35 8 21 Gleating the ogger Cohlelib us usa ue eunt aecdda suus cta ead doin NN Uc R dn RU due ud 35 O9 GOMMUNICAUON ence toot datus uus otia fud adus sud e fedes eb tar Neid d pud au 36 9 MaIntelali6e 55min sexus assu eios asc a ESL UE d UP lauE sOE sus ExGa du UE Sua UE acad us aot dat nnmnnn nnmnnn 37 9 1 Fusereplacement esses nennen nnne nnn nnns nenne sanae rne nnns 37 22 Cleaning TTT 37 JS PenodiccalbraloM ernes a AA 37 SP MEME SV ne RIT TT T UU T uU THIS 37 10 Technical specifications cssss sese es vee e ecce ecce seene eee nnnm nnn nnne nnn nnns 38 10 1 Step voltage Contact voltage acessar EE aE Ea 38 10 2 e Sie RETE EAER 38 10 3 Resistance to earth eee 38 WOE SCN Chal T desdosnieeatcanseusicumenniconesaiccninnsicanesmtsanneeen 39 MI 3295 Step Contact Voltage Measuring System Preface 1 Preface Congratulations on your purchase of the measuring system from METREL The Step Contact Voltage Measuring System consists of Station MI 3295S and Meter MI 3295M and is intended for the following tests and measurements a Step voltage a Contact voltage a Earth resistance The instrument is equipped with all the necessary accessory for comfortable testing The PCSW HVlink PRO enables downloading of resu
8. object and locations This organization helps to handle with data in a simple and effective manner The main advantages of this system are a Test results can be organized and grouped in a structured manner a Simple browsing through structures and results a Test reports can be created with no or little modifications after downloading results to a PC RECALL RESULTS OBJECT eal RECALL RESULTS OBJECT Hl LOC Hel LOC l HMo TAT STEP WOLT Figure 8 1 Data structure and measurement fields Data structure field SS H HIRE Memory operation menu OBJECT H l LOCI ARI Data structure field LOLS HHI a 1 level OEJECT bel OBJECT Default location name object and its successive number a 2 level LOC Bad LOC1 Default location name and its successive number a 3 level LOC2 Default location name and its successive LOULY HHI picis a 001 No of selected element 31 MI 3295 Step Contact Voltage Measuring System Data handling Measurement field Ho 1 No of measurements in selected location No of measurements in selected location Ho r C13 No of measurements in selected location and its sub locations Ho fee No of selected test result No of all stored test results in selected location STEF UOLT Type of stored measurement in the selected location 8 1 2 Storing test results After the completion of a test the results and parameters are ready for storing Ei icon is displayed in the info
9. 2 L aen 18 64 Iflt 1 kh l Figure 8 5 Example of recalled measurement result Keys in recall memory menu measurement results are displayed Cursor LEFT RIGHT Displays measurement results stored in selected location Cursor UP DOWN View all test parameters Exits back to measurement field 8 1 4 Clearing stored data Clearing complete memory content Select CLEAR ALL MEMORY in MEMORY menu A warning will be displayed CLEAR ALL MEMORY All saved results will be lost Figure 8 6 Clear all memory Keys in clear all memory menu TEST Confirms clearing of complete memory content Exits back to Settings main menu without changes CLEARING MEMORY EREMO Figure 8 7 Clearing memory in progress 33 MI 3295 Step Contact Voltage Measuring System Data handling Clearing measurement s in selected location select DELETE RESULTS in MEMORY menu DELETE FESULTS DELETE FESULTS DELETE FESULTS OBJECT Hl OBJECT Hl OBJECT Hil gt LOCI i LOC1 Hel LOC1 Hel gt LOC mui ES aed pail Nowe STC CLEAR RESULTS Figure 8 8 Clear measurements menu data structure field selected Keys in delete results menu data structure field selected Cursor UP DOWN Selects location element Object Loc1 Loc2 Cursor LEFT RIGHT mae of selected location element Exits back to Settings main menu Opens dialog for confirmation to clear result s in selected location Keys in dialog for confirmation
10. ACT VOLT in Si4Meleni ue menu and confirm Follow the information on the Meter LCD If the synchronization succeeds a confirmation beep will follow the xele A and INGE messages Connections for synchronization For connection of the instruments see Figure 7 7 SYNCHRONIZE Be DG TTS lags HOT SYNCHRONIZED 6 Figure 7 10 Examples of synchronization screens NOT SYNCHRONIZED number of non synchronized results Note Q Synchronization of Step Contact voltage results can last up to several 10 seconds A bargraph is showing the progress ae 7 3 Earth resistance 7 3 1 Earth resistance measurement Figure 7 11 Earth resistance 29 MI 3295 Step Contact Voltage Measuring System Measurements Earth resistance measurements Select zz dl function using the function selector switch Connect C2 E test lead and ES potential lead to main earthing point Connect C1 H test lead to current probe Connect S potential lead to potential probe Press the TEST key to perform the measurement otore the result with MEM key optional Connections for earth resistance measurement For connections see Figure 7 4 Figure 7 12 Example of earth resistance measurement result Displayed results for earth resistance measurement Eanna Earth resistance aE Resistance of S potential probe BOT Resistance of H current probe Notes a High resistance of S and H probes could influence the measureme
11. N 61010 1 Safety requirements for electrical equipment for measurement control and laboratory use Part 1 General requirements IEC EN 61010 Safety requirements for hand held probe assemblies for electrical 031 measurement and test Functionality HD 637 S1 Power installations exceeding 1 kV a c ANSI IEEE Std 81 IEEE Guide for Measuring Earth Resistivity Ground Impedance and Earth Surface Potentials of a Ground System RAT 2008 opain High Voltage regulation MI 3295 Step Contact Voltage Measuring System Instrument description 3295 M Meter 3 Instrument description MI 3295M Meter 3 1 Front panel RR N MI Rovere Qe oo oo 7 on Ay m oy y d f Figure 3 1 Front panel Legend 1 ESC Returns to previous menu 2 MEM Handling with memory 3 Cursor and TEST keys Cursors Selects test parameters TEST Starts stops measurement 4 BACKLIGHT CONTRAST Changes backlight level and contrast 5 LCD LCD display with backlight Switches the instrument power on or off 6 ON OFF The instrument automatically turns off 15 minutes after the last key was pressed 7 8 Function selector Selects test function and settings 10 MI 3295 Step Contact Voltage Measuring System Instrument description 3295M Meter 3 2 Connector panel Figure 3 2 Connector panel Legend 1 Test connector Warning Maximal allowed voltage between test terminals and ground is 50 V Maximal allowed
12. ea of distribution systems a Do not use the instrument and accessories if any damage is noticed a Service intervention or adjustment and calibration procedure is allowed to be carried out only by a competent authorized person a Use only standard or optional test accessories supplied by your distributor Meter MI 3295M a Instrument contains rechargeable NiMh battery cells The cells should only be replaced with the same type as defined on the battery placement label or in this manual Do not use standard alkaline battery cells while power supply adapter is connected otherwise they may explode a Disconnect all test leads remove the power supply cable and switch off the instrument before removing battery compartment cover a The weight of each test probe is 25 kg This weight may be harmful if the probes are not lifted and carried appropriately Station MI 3295S a During instrument operation ventilation holes on casing should always stay open to ensure sufficient air flow for cooling a Disconnect all test leads switch off the instrument and remove the mains cord before changing the fuse a The weight of the MI 3295S is 29 5 kg This weight may be harmful if the instrument is not lifted and carried appropriately It is recommended that the instrument is transported by 2 persons 2 2 Battery and charging of MI 3295M The instrument MI 3295M uses six AA size alkaline or rechargeable Ni Cd or Ni MH battery cells Nominal operatin
13. edetandeadetadeess 21 SRM V Rer Im 21 Ho UNE Kets ls lt REESE E E 22 60 2 Tez E lt lt n Tels 22 6 60 23 R QING b UME sorserien usu Even EUieEbdnp ker uo EMT Nat uanbn us ax pau p eM MM PIE DE Io LIE P SMU 22 6 6 4 Output DOW ECE Tage isses cie cates Pet douane ther eios Cabe oe DAE cv Gealehuaheeteaa res e Kia UI DUE 22 6 6 5 3 IURRPNR T T UU e 23 f Measurements 525 e eee redu eee eee ae ee eee eA ie ees 24 7 1 Theory of measurements ssssssssssessseseeesene NERE 24 kil General oh earthitigusi uc elesseiet eu ua un HILL ie idet e TT 24 7 052 Measurement aciei peiuh vedef a Eau ceu inu usada uenia crat aa De ue s hag cmi au bea Salade 25 7 2 Step and Contact voltage sse eee 26 424 eiee R lt test CUPRFOHE eaii a Moo du eiua mda dtu detti bupeddevedds 26 7 2 2 Synchronization before the test recommended 2f 3 MI 3295 Step Contact Voltage Measuring System Table of contents 7 2 3 Step voltage Contact voltage measurement ee e e eee e eee 28 7 2 4 Synchronization after the test recommended 29 rM aiU TaLe TT TIT 29 7 3 1 Earth resistance measurement eee ee e ee ee ee 29 S Data Tse Ta mr M 31 om MEN uem CCP 31 8 1 RI SUCU FREE RR m tm 31 O 1 2 SSSItOI gest IESUS ate eee tua Mte Eu E LR denied etutetuca bag ote dco i ot eb tA deat bus acted ate 32 9 1 9 Recalling lest BI eco
14. g time is declared for cells with nominal capacity of 2100 mAh Battery condition is always displayed in the lower right display part In case the battery is too weak the instrument indicates this as shown in figure 2 1 This indication appears for a few seconds and then the instrument turns itself off 6 MI 3295 Step Contact Voltage Measuring System Safety and operational considerations TOO LOW Bl Figure 2 1 Discharged battery indication The battery is charged whenever the power supply adapter is connected to the instrument Internal circuit controls charging assuring maximum battery lifetime The power supply socket polarity is shown in figure 2 2 Figure 2 2 Power supply socket polarity The instrument automatically recognizes the connected power supply adapter and begins charging Symbols Indication of battery charging Figure 2 3 Charging indication B A Before opening battery compartment cover disconnect all measuring accessories connected to the instrument and switch off the instrument a Do not charge alkaline battery cells a Insert cells correctly otherwise the instrument will not operate and the batteries could be damaged a Remove all battery cells from the battery compartment if the instrument is not used for a long period of time a Take into account handling maintenance and recycling requirements that are defined by related regulations and manufacturers of alkaline or rechargeable
15. helps to prevent from wrong interpretation of the Step and Contact voltage results The readings will be close to 0 V a pass if no test current is flowing 23 MI 3295 Step Contact Voltage Measuring System Measurements 7 Measurements 7 1 Theory of measurements 7 1 1 General on earthing An earthing electrode grid depleted into ground has a certain resistance depending on its size surface oxides on the metal surface and the soil resistivity around the electrode The earthing resistance is not concentrated in one point but is distributed around the electrode Correct earthing of exposed conductive parts assures that the voltage on them stays below dangerous level in case of a fault If a fault happens a fault current will flow through the earthing electrode A typical voltage distribution occurs around the electrode the voltage funnel The largest part of the voltage drop is concentrated around the earth electrode Fig 7 1 shows how fault step and contact voltages occur as a result of fault currents flowing through the earthing electrode grid in the ground Fault currents close to power distribution objects substations distribution towers plants can be very high up to 200 kA This can result in dangerous step and contact voltages If there are underground metal connections intended or unknown the voltage funnel can get atypical forms and high voltages can occur far from the point of failure Therefore the voltage distr
16. ibution in case of a fault around this objects must be carefully analyzed L Fault current f yv U U Figure 7 1 Dangerous voltages on a faulty earthing system Standard IEC 61140 defines following maximum allowed time contact voltage relations Maximum time of exposure Voltage Uc lt 50 Vac or lt 120 Voc Uc 115 Vac or x 180 Vpc Uc x 200 Vac Uc x 250 Vac Table 13 Maximum time durations vs fault voltage For a longer exposure the touch voltages must stay below 50 V 24 MI 3295 Step Contact Voltage Measuring System Measurements 7 1 2 Measurement During the measurement a test current is injected into the earth through an auxiliary probe The resistance of the auxiliary probe should be as low as possible in order to inject a high test current The resistance can be decreased by using more probes in parallel or using an auxiliary earthing system as the auxiliary probe A higher injected current improves the immunity against spurious earth currents Step voltage The measurement is performed between two ground points at a distance of 1 m as shown on Fig 7 2 The 25 kg measuring probes simulates the feet The voltage between the probes is measured by a voltmeter with an internal resistance of 1 kO that simulates the body resistance Figure 7 2 Step voltage measurement Contact voltage The measurement is performed between an earthed accessible metal part and ground as shown on Fig 7 3 The voltage bet
17. instrument to dry totally before use Warnings a Do notuse liquids based on petrol or hydrocarbons a Do not spill cleaning liquid over the instrument 9 3 Periodic calibration It is essential that the test instrument is regularly calibrated in order that the technical specification listed in this manual is guaranteed We recommend an annual calibration Only an authorized technical person can do the calibration Please contact your dealer for further information 9 4 Service For repairs under warranty or at any other time please contact your distributor 3 MI 3295 Step Contact Voltage Measuring System Technical specifications 10 Technical specifications 10 1 Step voltage Contact voltage 2 of reading 2 dig 20 0 59 9 V Calculated measuring Accuracy range U Displayed Step Contact voltage is obtained on base of calculation Us U meas laul laen Uc Umeas laul laen laut selectable 10 A 200 kA Input resistance selectable 1 kO 1 MO Noise cancelation DSP filtering 55 Hz 64 dB rejection of 50 60 Hz noise Test terminals 10 2 Current 0 00 9 99 A 0 01 A 3 of reading 5 dig 10 0 99 9 A 3 of reading 3 dig Current generator 55 A max Test voltage lt 55 V Test frequency 55 Hz Test terminals C1 H C2 E 10 3 Resistance to earth 0 001 1 999 Q 0 001 Q 2 00 19 99 O 0 01 O 2 of reading 5 dig 20 0 99 9 Q 100 0 199 9 Q 5 96 of
18. its is 0 2 of measured value per C and 1 digit 40
19. leads to the instrument Press the TEST key to perform the measurement otore the result by pressing the MEM key optional a Ihe measurements can be carried out without synchronization In this case the measuring current must be controlled and set changed manually The results cannot be corrected after the measurement Connections for step and contact voltage measurement For connections see figures 7 2 and 7 3 STEP WOLT 13 34 4 9 Um 42 rm iis HE rc EMEN Figure 7 9 Examples of step and contact measurement results 28 MI 3295 Step Contact Voltage Measuring System Measurements Displayed results for step and contact voltage measurements E calculated Step or Contact voltage Um measured Step or Contact voltage a For dry soil or concrete floor a damp cloth or a film of water should be placed between the probe and the floor a Itis possible to work with more Meters at the same time 7 2 4 Synchronization after the test recommended If the Meter and Station were synchronized during the measurements they should be synchronized again after finishing the tests In this step the values of generated currents measured with the Station are downloaded to the Meter On base of the real generated current data the correction of measured results in the Meter is done For more information see chapter 5 4 5 Synchronization Connect Meter to the Station with the RS232 cable On Meter select STEP CONT
20. lts storing of results and making test reports Some measuring system highlights a Graphic LCD displays on Meter and Station Autonomous Step Contact Voltage Meter s Over 1000 memory locations in data flash memory for storing test results amp parameters USB and RS232 ports on Meter for communication with PC Synchronization between Meter and Station Large test current of up to 50 A otable and accurate results due to a DSP measuring system Fully compatible with new METREL HVLink PRO PC software package U U U U U U U MI 3295 Step Contact Voltage Measuring System Safety and operational considerations 2 Safety and operational considerations 2 1 Warnings and notes In order to reach high level of operators safety while carrying out various tests and measurements using the Step Contact Voltage Measuring System as well as to keep the equipment undamaged it is necessary to consider the following general warnings B A Warning on the instrument means Read the Instruction manual with special care to safety operation The symbol requires an action a If the test equipment is used in a manner not specified in this user manual the protection provided by the equipment might be impaired a Read this user manual carefully otherwise use of the instrument may be dangerous for the operator or for the instrument a All normal safety precautions have to be taken in order to avoid risk of electric shock when working in the ar
21. ment menu Keys for contrast adjustment Cursor LEFT RIGHT Sets contrast TEST Accepts new contrast Exits without changes 6 5 Function selection For selecting test function the FUNCTION SELECTOR shall be used Selects test measurement function Function a EARTH RE earth resistance selector a CURRENT GEN generation of measuring current a SETTINGS settings 6 6 Settings Different instrument options can be set in the SETTINGS menu Options are SETTINGS BELLIS a Selection of language initi INITIAL SETTINGS B Setting the instrument to initial values POWER RANGE Q Setting the output power of the MEMORY generator i a Setting the alarm Figure 6 4 Options in Settings menu 21 MI 3295 Step Contact Voltage Measuring System MI 3295S Station operation a Recalling and clearing results a Setting date and time Keys Cursor UP DOWN Selects appropriate option TEST Enters selected option Exits back to main function menu 6 6 1 Language oame as in MI 3295M see chapter 5 4 1 Language 6 6 2 Initial settings INITIAL SETTINGS selecting this option will allow the user to reset the instrument settings and measurement parameters and limits to the initial factory settings cet to default aE VES Figure 6 5 Initial settings screen Keys Cursor LEFT RIGHT Selects Yes or No TEST Restores default settings if Yes is selected ESC Exits back to Settings main menu witho
22. nd 7 2 4 Synchronization after the test for more information about the advantages of synchronized measurements The available place in the logger is shown in the right side of the Current Generator screen see Fig 6 2 Once the logger is full its content must be cleared 8 2 1 Clearing the logger content select CLEAR CURRENT LOG in MEMORY menu A warning will be displayed CLEAR CURRENT LOG All Saved currents will be lost Figure 8 12 Clear current logger Keys in Clear Logger menu Figure 8 13 Clearing logger in progress 35 MI 3295 Step Contact Voltage Measuring System Data handling 8 3 Communication Stored results can be transferred to a PC from the Meter A special communication program on the PC automatically identifies the instrument and enables data transfer between the instrument and the PC There are two communication interfaces available on the Meter USB and RS232 he instrument automatically selects the communication mode according to detected interface USB interface has priority How to transfer stored data R9232 communication connect a PC COM port to the instrument PS 2 connector using the PS 2 RS232 serial communication cable USB communication connect a PC USB port to the instrument USB connector using the USB interface cable Switch on the PC and the instrument Run PCSW HVLink PRO The PC and the instrument will automatically recognize each other The instrument is prepared to do
23. nt results In this case the Probe warnings are displayed a High noise currents and voltages in earth could influence the measurement results The tester displays the Noise warning in this case a Probes must be placed at sufficient distance from the measured object a To view stored earth resistance results on PC they must be downloaded to the Meter first To download the results select Earth results in Synchronize menu After the results are downloaded the stored data in the Station will be automatically deleted For connection of the instruments see Figure 7 7 30 MI 3295 Step Contact Voltage Measuring System Data handling 8 Data handling 8 1 Memory Measured results together with all relevant parameters can be stored in the memory of Meter and Station a Step and Contact voltage measurements can be stored in the Meter a Earth resistance measurements can be stored in the Station and then be downloaded to the Meter a Values of generated currents are automatically stored in the Station s logger 8 1 1 Data structure The instrument s memory place is divided into 3 levels each containing 199 locations each The number of measurements that can be stored into one location is only limited by available memory The data structure field describes the identity of the measurement which object and location The measurement field contains information about type and number of measurements that belong to the selected structure element
24. nt set and accessories sssssssesese Herren 14 Ak re Ts Te Tes E TTT 14 4 2 2 XOptolal accessorles side iie ivre er coe a deb eic eiit dv EE ier PEE Tdv uias 14 9 MI 3295M Meter ODBEF3UOTL o ovis vOs vie Va Us VEU eR V OU bu va SQUE Web UUv Ew OCw EuCS FUE viru ut alcun wit ou 15 B21 ORGANIZATION OF aiSplayucuesetesesestledete de ede noche EER 15 S lel BalterydJneledllODb z sees tiun qu Eon a ice E EE 15 9 1 2 Warnings ara MESSAGES osisssa en tese tutius duse tuae e a dens euasit tesi uto 15 9 2 Backlight and contrast adjustments d tiro oboe deese d oves e AE 16 S9 F riclloDn Selections e ove De REP ER EE takes 16 o s soi Tr ae en a See ee eee ee 16 SAT WAMGUAGC hr E aeeaiec usenet 17 Die ICID Sree NS acces va E T TTE 17 O40 Initial Setia usos vi ccbadutese A EA E EA 17 9 4 4 NAL CANG UME occi soni Ro en creo v ec quies i ute nn e ee v re bv b ehe s 18 e eU leni ele AN OM tutis onu eget edes e cand oan dde ttd fida bie bulum fe 18 6 MI 32955 Station ODeratlOli ioa oae deve den eenn nenen 20 OT Organizan OF displays sos pdt andas aon tera inca dpt me pua nce c pads cepa temo dps cedponds 20 62 NVAFAINGSANGHMCSSAGESS susieina Ieri dut edades e Mendes ue encU 20 6 3 Hep 1 e I A CERTE UELUT aAa aa iaai A 21 64 Contrast ADIUSINCIISS x ciecer rise osexdiadorescieteees ie tecte See ucds eacahdox Stace ie Stecheoaes aE 21 Oo RT Tele Seleccion cte tetedi Se tadewatndenees tedeciateteteentetadueutetateealedaoea
25. ored Measurement result is inside pre set limits PASS I Measurement result is out of pre set limits FAIL 15 MI 3295 Step Contact Voltage Measuring System MI 3295M Meter operation 5 2 Backlight and contrast adjustments With the BACKLIGHT key backlight and LCD CONTRAST contrast can be adjusted xul Figure 5 2 Contrast adjustment menu BACKLIGHT key Toggle backlight intensity level Lock high intensity backlight level until power is turned off or the Keep pressed for 1 s key is pressed again Keep pressed for2s Bargraph for LCD contrast adjustment is displayed Keys for contrast adjustment Cursor LEFT RIGHT Sets contrast TEST Confirms new contrast Exits without changes 5 3 Function selection For selecting function main menus the FUNCTION SELECTOR shall be used selects test measurement function Function a STEP VOLT gt step voltage test selector a CONTACT VOLT gt contact voltage test a SETTINGS settings synchronization 5 4 Settings Different instrument options can be set in the SETTINGS menu Options are a Selection of language Banana EN a Help screens Lat amen er a Synchronization with the Station ccna ag a Setting the instrument to initial values i a Recalling and clearing stored results Figure 5 3 Settings menu a Setting date and time Keys Cursor UP DOWN Selects appropriate option TEST Enters selected option 16 MI 3295 Step Contact
26. reading Open circuit voltage 1eeeeseeeeeeeeeees 50 VAC hR eUiu TH REN lt 7 5A MI 3295 Step Contact Voltage Measuring System Technical specifications Test signal frequency eeeeeeeeeeeeeeee 55 Hz Influence of probe resistance lt 10 of reading 10 digits Rc Rp max 10 Q 100 R or 2 KQ whichever is lower Automatic test of probe resistance yes Automatic detection of voltage noise Test terminals S ES C1 H C2 E 10 4 General data Station Rated supply voltage 230 V AC 10 96 50 or 60 Hz Max power consumption 750 VA Overvoltage category CAT Il 300 V Measuring category sss CAT IV 50V Protection classification Class General protection of the instrument morir RE T5A 250 V 5 mm x 20 mm Pollution degree 3 Degree of protection IP 30 Biel cR 128 x 64 dots matrix display with backlight MEMO EET EUN 1000 memory locations Current aes 24 hours min Communication interface RS232 for communication with Meter only Dimensions wxhxd 06 3 cm x 27 5 cm x 25 7 cm WEINE e 29 5 kg without accessories Meter Power supply voltage 9 Voc 6 x 1 5
27. rmation field By pressing the MEM key the user can store the results Figure 8 2 Save test menu Display information FREE 99 14 Memory available for storing results Keys in save test menu data structure field Cursor UP DOWN Selects the location element Object Loc1 Loc2 Selects number of selected location element 1 to 199 w a aE eum returns to the measuring menu ESC Notes a The instrument offers to store the result to the last selected location by default a If the measurement is to be stored to the same location as the previous one just press the MEM key twice 8 1 3 Recalling test results In MEMORY menu select RECALL RESULTS RECALL RESULTS OBJECT eal RECALL RESULTS gt OBJECT 091 HMo TAT STEP WOLT Figure 8 3 Recall menu data structure Figure 8 4 Recall menu measurements field selected field selected 32 MI 3295 Step Contact Voltage Measuring System Data handling Keys in recall memory menu data structure field selected Cursor UP DOWN Selects the location element Object Loc1 Loc2 Cursor LEFT RIGHT Selects number of selected location element 1 to 199 TEST Confirms selection and enters measurements field ESC Exits back to main function menu Keys in recall memory menu measurements field selected Cursor LEFT RIGHT Selects the stored measurement TEST Displays measurement results Exits back to data structure field Une 51 2ml 3
28. s C1 H and C2 E is higher than u 10 0 i3 allowed gt 10 V Disconnect the test leads and check why an external voltage was detected Output was overloaded or test current abruptly fall down Overload can be caused by high spurious earth current In this case it is recommended to decrease the output power See chapter 6 6 4 Output power range for more information Output current is too low A too low current can be caused Tep because of bad connection or high probe resistance connections to ear z Date time was changed in the Station and consequentially TIME HAS CHANGED o the synchronization between Station and Meter is lost The m a Current logger must be cleared Before clearing it its content ULT BE DONNCOADTEN TO METER can be downloaded to the Meter 20 MI 3295 Step Contact Voltage Measuring System MI 3295S Station operation In the message field warnings and messages are displayed Output power is not set to maximum EN Measurement is running consider displayed warnings Pd High electrical noise was detected during measurement Results may be High resistance of current c and or voltage p probes Results may be impaired Result s can be stored 6 3 Help screens Same as in MI 3295M see chapter 5 4 2 Help screen The help screens can be accessed with the HELP key 6 4 Contrast adjustments With the LIGHT key contrast can be LCD CONTRAST adjusted __ O Figure 6 3 Contrast adjust
29. short and messages Connections for synchronization RS 232 Fig 7 7 Connection of the instruments during synchronization 2f MI 3295 Step Contact Voltage Measuring System Measurements Note a he measurements can be carried out without synchronization In this case the measuring current must be set changed manually If the injected current is changing during the test the Iser parameter must be adjusted manually The measurement results cannot be corrected after the measurement 7 2 3 Step voltage Contact voltage measurements While the Station injects the measuring current into earth the Step or Contact voltage tests with the Meter can be carried out Lins L ir ae i ip an Figure 7 8 Step and Contact Voltage Test parameters for Step Contact voltage measurement fit Maximum expected fault current 10 A 200 kA set gen Test current manual set 0 20 A 50 A or uploaded from Station Input resistance 1 MOQ 1 kQ Input resistance 1 MO 1kKO 11 1 Limit step voltage 25 V 50 V Step or Contact voltage measurements Select REATO or jeje gyte Ae function Set test parameters limits optional For Step voltage place the test electrodes see chapter 7 1 2 Measurement for more information For Contact voltage place one test electrode and connect accessible metal part see chapter 7 1 2 Measurement for more information Connect the test
30. t je hai ae function a Press the TEST key to start the generation of the current a Check the value of the current Connections for step and contact voltage measurement For connections of the Station see figures 7 2 and 7 3 CURRENT GEN 12 45 42 85 ES Figure 7 6 Example of the display during generation of current Note a The output power is set automatically to its available maximum In case of troubles generator switches off refer to chapter 6 6 4 Output power range a Incompletely unwound measuring cable can influence on size of generated test current coil impedance a Usually the resistance of auxiliary probe limits the injected current The injected current can be increased by placing more probes in parallel 7 2 2 Synchronization before the test recommended Before starting with the Step and Contact voltage measurements it is recommended to synchronize the Meter and the Station The synchronization sets the same date and time in both units Therefore the measured voltages can be correctly scaled after the measurements If the current is generated during the synchronization its value of is also send to the Meter For more information see chapter 5 4 5 Synchronization a Connect Meter to the Station with the RS232 cable a On Meter select the TIME CURRENT option in KA4i e s rie7 F4z menu and confirm Follow the information on the Meters LCD If the synchronization succeeded a confirmation beep will follow after
31. tation 4 2 Instrument set and accessories 4 2 1 Standard set Instrument MI 3295M oO O O cs cs O l AIK A N oO oO QO GO O GO O Q O QO O O SPERN os ER ND EE GE p p OTIO p p Calibration certificate E 4 2 2 Optional accessories zx O See the attached sheet for a list of optional accessories that are available on request from your distributor 14 MI 3295 Step Contact Voltage Measuring System MI 3295M Meter operation 5 MI 3295M Meter operation 5 1 Organization of display CONTACT WOLT 60 26 Function name Um 41 Ami ud Ty v Result field Th Um 41 ml LOL ENTM Test parameter field ilg Message field Figure 5 1 Typical function display 5 1 1 Battery indication The battery indication indicates the charge condition of battery and connection of external charger Battery capacity indication Low battery I Battery is too weak to guarantee correct result Replace or recharge the battery cells a I Recharging in progress if power supply adapter is connected Warning a Ifthe batteries are removed for more than 1 minute set time and date will be lost the instrument will return to Initial settings 5 1 2 Warnings and messages In the message field warnings and messages are displayed The Meter and Station are not synchronized Bh Ede EN Measurement is running consider displayed warnings Result s can be st
32. to clear results in selected location TEST Deletes all results in selected location Exits back to delete results menu without changes Clearing individual measurements select DELETE RESULTS in MEMORY menu DELETE RESULTS OBJECT H l Ho 5 dT CONTACT VOLT Figure 8 9 Menu for clearing individual measurement measurement field selected Keys in delete results menu data structure field selected Cursor UP DOWN selects location element Object Loc1 Loc2 Cursor LEFT RIGHT come of selected location element TEST Enters measurements field Exits back to Settings main menu Keys in delete results menu measurements field selected Cursor LEFT RIGHT Selects measurement Opens dialog box for confirmation to clear selected measurement Exits back to data structure field Keys in dialog for confirmation to clear selected result s TEST Deletes selected measurement result Exits back to measurements field without changes 34 MI 3295 Step Contact Voltage Measuring System Data handling DELETE FESULTS DELETE FESULTS OBJECT Hel OBJECT Hel LOC l LOCI l gt How 2602 gt How 1 1 Figure 8 10 Dialog for confirmation Figure 8 11 Display after measurement was cleared 8 2 Current Logger If the Meter and Station are synchronized the values of generated currents are stored together with time and date in a separated part of the Station s memory See chapters 5 4 5 Synchronization a
33. ttery pack it results in heating of the battery pack significantly decreased operation time reversed polarity of defective cell a If no improvement is achieved after several charge discharge cycles then each battery cell should be checked by comparing battery voltages testing them in a cell charger etc It is very likely that only some of the battery cells are deteriorated a The effects described above should not be confused with the normal decrease of battery capacity over time Battery also loses some capacity when it is repeatedly charged discharged This information is provided in the technical specification from battery manufacturer 2 3 Standards applied The Step Contact Voltage Measuring System MI 3295 is manufactured and tested according to the following regulations listed below Electromagnetic compatibility EMC IEC EN 61326 1 Electrical equipment for measurement control and laboratory use EMC requirements Part 1 General requirements Class B Hand held equipment used in controlled EM environments IEC EN 61326 2 2 Electrical equipment for measurement control and laboratory use EMC requirements Part 2 2 Particular requirements Test configurations operational conditions and performance criteria for portable test measuring and monitoring equipment used in low voltage distribution systems MI 3295 Step Contact Voltage Measuring System Safety and operational considerations Safety LVD IEC E
34. ut changes Initial settings are Instrument setting Contrast Language Power Range 6 6 3 Date and time Same as in MI 3295M see chapter 5 4 4 Date and time 6 6 4 Output power range IWER RANGE In this menu the power of the current es generator can be set Figure 6 6 Output power menu Keys Cursor UP DOWN Selects appropriate option 50 75 100 TEST Sets selected power Returns to Settings main menu 22 MI 3295 Step Contact Voltage Measuring System MI 3295S Station operation Note When the current generator is started the output power is automatically set to the available maximum If the conditions changed during the measurement the generator may switch off Possible reasons for switching off are a The output can become overloaded by high external earth currents In this case it is recommended to decrease the output power to 75 or 50 and restart the generator a The current stopped flowing abruptly If the stop was caused by disconnection of the leads it is not necessary to lower the power The generator can be restarted 6 6 5 Alarm An audible alarm warns the user that the current generator switched off due to overload or abrupt change of current The alarm can be activated deactivated in Ee nae Figure 6 7 Language selection Keys Cursor UP DOWN Enables disables the alarm TEST Confirms selected option ESC Returns to Settings main menu Note a An enabled alarm
35. voltage between test terminals is 100 V 2 Power supply socket 3 PS 2 connector for RS232 communication 4 Protection cover 5 USB connector 3 3 Back site Figure 3 3 Back panel Legend 1 Battery compartment cover 2 Information label 3 Fixing screws for battery compartment cover 11 MI 3295 Step Contact Voltage Measuring System Instrument description 3295M Meter Figure 3 4 Battery compartment Legend 1 Serial number label 2 Battery cells size AA 3 Battery compartment 12 MI 3295 Step Contact Voltage Measuring System Instrument description 3295S Station 4 Instrument description MI 3295S Station 4 1 Front panel 1 5A 250V Step Contact Voltage Measuring System Mains fuse Mains input Power On Off switch RS232 connector C1 H S ES C2 E HELP Function selector LCD CONTRAST MEM ESC Cursor and TEST keys TEST Figure 4 1 Front panel See chapter information For connection to mains cord 9 1 Fuse replacement for more For connection to the Meter Connection for auxiliary earthing probe Connection for voltage sense probe Connection for second voltage sense probe Connection for auxiliary earthing probe Help menus Selects test function and settings LCD display with backlight Changes contrast Handling with memory Returns to previous screen Cursors Selects test parameters Starts measurement 13 MI 3295 Step Contact Voltage Measuring System Instrument description 3295S S
36. ween the probes is measured by a voltmeter with an internal resistance of 1kO that simulates the body resistance Figure 7 3 Contact voltage measurement 25 MI 3295 Step Contact Voltage Measuring System Measurements As the test current is usually only a small fraction of the highest fault current the measured voltages must be up scaled according to following equation I U sc L Gen SY calculated step or contact voltage in case of fault current Umeasured Measured voltage during the test T maximal earth current in case of a fault aenean injected test current Earth resistance For the earthing resistance test a voltage and current probe serves as auxiliary earth are used Because of the voltage funnel it is important that the test electrodes are placed correctly More information about measuring earth resistance can be found in the METREL handbook Guide for testing and verification of low voltage installations Figure 7 4 Earth resistance measurement 7 2 Step and Contact voltage 7 2 1 Injection of test current Before starting the Step or Contact voltage measurements the test current must be injected in the earth with MI 3295S Figure 7 5 Current generator screen 26 MI 3295 Step Contact Voltage Measuring System Measurements a Connect C2 test lead to the main earthing point a Place the earth probe a Connect C1 test lead to the earth probe or another auxiliary earthing point oa Selec
37. wnload data to the PC The program HVLink PRO is a PC software running on Windows XP Windows Vista and Windows 7 Read the file README HVLinkPRO txt on CD for instructions about installing and running the program Note a USB drivers should be installed on PC before using the USB interface Refer to USB installation instructions available on installation CD 36 MI 3295 Step Contact Voltage Measuring System Maintenance 9 Maintenance Unauthorized persons are not allowed to open the instruments There are no user replaceable components inside the instrument except the battery under rear cover of Meter MI 3295M See chapter 2 2 Battery and charging of MI 3295M 9 1 Fuse replacement There is a fuse on the front cover of the MI 3295S Station a T5A 250V 5 mm x 20 mm This fuse prevents from danger in case of a fault inside the instrument Warnings B A Disconnect all measuring accessories switch off the instrument and disconnect mains cord before opening the cover of fuse holder hazardous voltage inside a Replace blown fuse with original type only otherwise the instrument may be damaged and or operator s safety impaired Position of a fuse can be seen in Figure 4 1 in chapter 4 1 Front panel 9 2 Cleaning No special maintenance is required for the housing To clean the surface of both instruments Meter MI 3295M and Station MI 3295S use a soft cloth slightly moistened with soapy water or alcohol Then leave the
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