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Service Manual Type MVTU Definite Time Delayed Relays

1. 9 y 3 SJODJUOD 5 5 uounquisip 10 EL NLAW 294 Anjos jueueop dsip jonau dyos g einbi4 AOE 1340916 saiddns op 104 Ajuo s 7 uo uo 02 dA e10 uwous so Sulu 7 spouiuuej Buoy o 2 xpeJq s puruue 4104S lq euuoosip 2 puo q IC Sem t B o S JON Tm K l pdn SPYd q 2 19U10JSUDJ 451 10 019U99 doys yoa esp 1091 WOJ 32 Section 7 COMMISSIONING TEST RECORD Definite Time Voltage Relays Type MVTU Date Station Circuit Relay Model No MVTU Serial No Rated AC Voltage Vn Lo Rext2 if required DC Auxiliary Voltage Vx Rext 1 if required DC Supply Check VX Volts Voltage Setting Check Timer Setting 2 O 1 s Voltage Setting Pick Up Value Drop Off Value Test Test 2 Test 3 Test 4 Test 5 Test 6 Test 7 Final Setting Timer Setting t1 Check Voltage setting Vs 1 1 2 2 3 9 4 4 5 5 6 6 7 7 8 8 9 9 Final Setting Ts Time 33 Timer Setting 12 Check MVTU 18 only 1 1
2. all circuits and earth An electronic or brushless insulation tester should be used having a dc voltage not exceeding 1kV Accessible terminals of the same circuit should first be strapped together Deliberate circuit earthing links removed for the tests must subsequently be replaced 13 4 5 4 5 1 4 5 2 AIS Functional testing Equipment required all versions Variac transformer DC voltmeter to check nominal dc volts AC voltmeter to cover setting range Resistance meter AC ammeter O 1OmA One double pole switch One electronic timer MVTU 11 and MVTU 12 380 440V versions only Step up transformer to cover setting range of 380 440V relay MVTU 13 and MVTU 18 One 6W 50kQ wirewound resistor Note Measuring accuracy depends on the accuracy of the instruments used DC auxiliary supply check Ensure that the correct series dropping resistor s are fitted if required Remove the relay from its case and check that the incoming dc supply at the relay case terminal 13 ve and 14 is within the range specified below Rated dc voltage V DC operative range V 30 34 24 37 5 48 54 37 5 66 110 125 87 5 150 220 250 175 300 Test block type MMLG IF a test block is included in the scheme it may also be associated with protection CT circuits It is important that the sockets in the type MMLBO1 test plug which correspond to the current transformer secondary windings are LINKED BEFORE THE TEST PLUG IS INSERTED
3. 57 70 100 120 220 250 380 440 57 70 100 120 220 250 380 440 Relay ac rating V 50 60Hz 57 120 57 120 57 120 57 120 Relay dc rating V 30 34 30 34 48 54 48 54 110 125 110 125 220 250 220 250 Relay dc rating V 30 34 48 54 110 125 220 250 MVTU 11 Undervoltage and MVTU 12 overvoltage Resistor assembly part number None required ZEO103 020 FJO340 007 ZEO103 021 FJO340 00 ZEO103 022 ZEO103 018 ZEO103 023 MVTU 13 Neutral displacement Resistor assembly part number None required FJO340 007 FJO340 00 2 0103 018 MVTU 18 Neutral displacement Dropper resistor values fitted series resistors ohm Rext 2 dc series resistor ohm Rext 1kO 1kO 2 x Ak7 in parallel 2 x Ak7 in parallel Dropper resistor fitted ac series resistors ohm Rext 2 dc series resistor ohm Rext 220R 1kO Ex 2 x Ak7 in parallel The MVTU 18 does not require external dropper resistors Section 3 INSTALLATION 3 1 3 2 3 3 3 4 3 5 3 6 Precautions Protective relays although generally of robust construction require careful treatment prior to installation and a wise selection of site By observing a few simple rules the possibility of premature failure is eliminated and a high degree of performance can be expected Packing The relays are either despatched individually or as part of a panel rack mounted assembly in ca
4. 57 70V and 100 120V versions and Figure 2 for the 220 250V and the 380 A440V versions IF the 380 440 version is being commissioned a step up transformer is needed to allow the calibration of the settings to be checked Check that the trip indicator is reset and slowly increase the ac voltage until the trip indicator operates Record the pick up value Slowly lower the voltage to see when the trip indicator can be reset This is the drop off value and should be recorded The allowable errors on the voltage settings are 2 on the lowest setting and 4 on all other settings no allowance has been made for instrument errors The drop off value should be within 5 of the pick up value Alternative test method for 380 440V versions of MVTU 11 and MVTU 12 This method should be used only when no step up transformer is available See Figure 3 for the test circuit Firstly accurately measure the resistance of the dropper resistor assembly Rext 2 With the relay on the lowest setting and the dropper resistor Rext 2 removed from the circuit measure the pick up voltage directly at the relay terminals 27 and 28 and the ac current into the relay at the pick up voltage Use the following formula to calculate the effective pick up voltage V eff VM I MRM where Vef effective pick up voltage VM measured pick up voltage with Rext 2 out of circuit IM the measured pick up current with Rext 2 out of circuit RM measured resistance of
5. EX V A KN N AS Service Manual Type MVTU Definite Time Delayed Relays ALSTOM Service Manual Type MVTU Definite Time Delayed Relays HANDLING OF ELECTRONIC EQUIPMENT A person s normal movements can easily generate electrostatic potentials of several thousand volts Discharge of these voltages into semiconductor devices when handling electronic circuits can cause serious damage which often may not be immediately apparent but the reliability of the circuit will have been reduced The electronic circuits of ALSTOM T amp D Protection amp Control Ltd products are immune to the relevant levels of electrostatic discharge when housed in their cases Do not expose them to the risk of damage by withdrawing modules unnecessarily Each module incorporates the highest practicable protection for its semiconductor devices However if it becomes necessary to withdraw a module the following precautions should be taken to preserve the high reliability and long life for which the equipment has been designed and manufactured Before removing a module ensure that you are at the same electrostatic potential as the equipment by touching the case Handle the module by its front plate frame or edges of the printed circuit board Avoid touching the electronic components printed circuit track or connectors Do not pass the module to any person without first ensuring that you are both at the same electrostatic pote
6. can now be withdrawn from the flag assembly iii Remove the 2 screws holding the flag spring and clamp plate to the bottom plate The flag spring can now be extracted from the assembly Note that the top and bottom plates cannot be removed from the relay front plate without damaging the adhesive name plate which covers the heads of the countersunk screws holding the top and bottom plates to the front plate Assembly is in the reverse order of dismantling Setting up procedure for the flag assembly Flag spring units are supplied pre bent and should need no further adjustment before assembly With the flag spring and printed circuit board carrying the miniature relay assembled to the top and bottom plates check the settings i Lift the flag spring to the latched position so that the tab on the flag spring rests on the catch on the relay ii With a gap of 0 4mm between the inside face of the armature and the core the flag should remain latched With a gap of O 15mm the flag should drop If necessary carefully bend the tab to fulfil these conditions These tests should be performed by positioning an appropriate feeler gauge between the armature and coil and then energising the coil with the appropriate voltage to pick up the relay ii With the flag in the latched position the spring should exert a force of 10 12 grams on the catch This is checked using a gram gauge just lifting the flag off the catch iv With th
7. 2 2 4 4 29 24 8 8 Final Setting Ts Contact Check All Relays 1 3 7 9 3 5 9 1 2 4 8 10 4 6 10 12 Commissioning Engineer Date Voltage Setting Vs 3 3 6 6 29 Time 5 MVTU 18 only Trip Indicator Check Operate Reset Customer Witness Date 34 REPAIR FORM Please complete this form and return it to ALSTOM T amp D Protection amp Control Ltd with the equipment to be repaired This form may also be used in the case of application queries ALSTOM T amp D Protection amp Control Ltd St Leonards Works Stafford 5117 ALX England For After Sales Service Department Customer Ref Model No Contract Ref Serial No Date 1 What parameters were in use at the time the fault occurred AC volts Main VT Test set DC volts Battery Power supply AC current Main CT Test set Frequency 2 Which type of test was being used 3 Were all the external components fitted where required Yes No Delete as appropriate 4 List the relay settings being used 5 What did you expect to happen continued overleaf 35 6 What did happen 7 When did the fault occur Instant Yes No Intermittent Yes No Time delayed Yes No Delete as appropriate By how long 8 What indications if any did the relay show 9 Was there any visual damage 10 Any other remarks which may be useful Signature Title Name in capitals Company name 36 37 38 39 ALSTOM ALSTOM T amp D Protection amp C
8. AUXILIARY EQUIPMENT External series resistors MVTU 11 Undervoltage and MVTU 12 overvoltage MVTU 13 Neutral displacement MVTU 18 Neutral displacement INSTALLATION Precautions Packing Inspection Unpacking Storage Siting COMMISSIONING TESTS Inspection and wiring check Electrostatic discharges ESD Connection of the MMLG test block Earthing Insulation check Functional testing DC auxiliary supply check Test block type MMLG Isolation of VT circuit Voltage setting check Timer setting check Final setting checks Trip indicator and contact check Final checks 10 10 10 10 10 10 11 11 11 12 12 12 12 12 12 12 13 13 13 13 13 8 14 14 14 14 15 18 19 19 19 5 5 2 6 1 6 2 6 3 6 4 6 5 6 6 6 6 6 6 2 6 6 3 6 7 6 8 6 9 6 10 6 10 1 6 10 2 6 11 MAINTENANCE Visual inspection Functional checks PROBLEM ANALYSIS Test equipment required for fault finding General procedure and precautions Inspection removal of module from case Connections for MVTU 11 MVTU 12 and MVTU 13 Checking voltage supplies to module Printed circuit board tests Monitoring of the voltage across relay coil Measurement of the dc operating currents of the modules Measurement of the ac operating currents of the modules Calibration information Repair and replacements Repair of trip indicator on MVTU 11 MVTU 12 and MVTU 13 relays Repair and replacement of miniature pcb mounted relay and flag
9. any commissioning test results Repair of trip indicator on MVTU 11 MVTU 12 and MVTU 13 relays IF the trip indication fails then it may be necessary to replace the mechanical flag unit or LED indicator pcb depending on which is fitted On the MVTU 18 only the LED trip indication and the output relays are fitted to pcb ZJ1060 which should be replaced complete in the event of trip indication failure Repair and replacement of miniature pcb mounted relay and flag mechanism where fitted The miniature relay cannot be repaired If it is proved to be operating incorrectly it must be replaced The flag assembly can be reset or damaged parts replaced as required If any part of the flag relay assembly is disturbed the settings of the assembly must be checked and adjustments made where necessary 26 6 10 1 To gain access to the flag assembly to replace parts or check the settings it is necessary to dismantle the module Once access to the flag assembly mounted on the front plate of the relay has been gained adopt the following procedure i Remove the screw holding the side plate to the top plate and remove the side plate This will reveal the miniature relay and the flat spring Access is possible through the side of the assembly unless impeded by other components ii Remove the screws 2 at the top 1 at the bottom holding the printed circuit board to the top and bottom plates The circuit board with the miniature relay
10. aware of the correct working procedures to ensure safety The product documentation should be consulted before installing commissioning or servicing the equipment Terminals exposed during installation commissioning and maintenance may present a hazardous voltage unless the equipment is electrically isolated IF there is unlocked access to the rear of the equipment care should be taken by all personnel to avoid electric shock or energy hazards Voltage and current connections should be made using insulated crimp terminations to ensure that terminal block insulation requirements are maintained for safety To ensure that wires are correctly terminated the correct crimp terminal and tool for the wire size should be used Before energising the equipment it must be earthed using the protective earth terminal or the appropriate termination of the supply plug in the case of plug connected equipment Omitting or disconnecting the equipment earth may cause a safety hazard The recommended minimum earth wire size is 2 5 mm unless otherwise stated in the technical data section of the product documentation Before energising the equipment the following should be checked Voltage rating and polarity CT circuit rating and integrity of connections Protective fuse rating Integrity of earth connection where applicable Equipment operating conditions The equipment should be operated within the specified electrical and environmental limit
11. for MVTU 13 Figure Test circuit for MVTU 13 18 and for 57 70V 110 120V versions of MVTU 11 and MVTU 12 15 p Up Transformer Figure 2 Test circuit for the 220 250V and the 380 440V versions of MVTU 11 and MVTU 12 Figure Test circuit for 380 440V version of MVTU 11 and MVTU 12 when no step up transformer is available MVTU 11 undervoltage relay See Figure 1 for the test circuits for 57 70V and 100 120V versions and Figure 2 for the 220 250V and the 380 440 versions IF the 380 440V version is being commissioned a step up transformer is needed to allow the calibration of the settings to be checked The ac input voltage should be increased to a value above the setting value and the trip indicator reset Slowly decrease the input voltage until the relay picks up when the trip indicator operates Record the pick up value Slowly increase the voltage checking to see when the trip indicator can be reset This is the drop off value and should be recorded Alternatively the pick up and drop off values can be determined using an ohmmeter connected across the contacts Repeat the test for each of the settings shown in Table 1 The allowable errors on the voltage settings are 2 on the lowest setting and 4 on all other settings no allowance has been made for instrument errors The drop off value should be within 5 of the pick up value MVTU 12 overvoltage relay See Figure 1 for the test circuits for
12. the voltage setting simultaneously starting the timer The timer stop contacts should be connected to the relay output contacts The allowable errors in the timer settings are 3 or 7Oms whichever is the greater 4 5 6 4 5 7 4 5 8 MVTU 18 neutral displacement Time delay t1 is checked as for MVTU 13 Time delay t2 is checked by connecting the timer as shown in Figure 4 and repeating the tests as for time delay t1 Start timer TI stop timer m TI O Stop timer T2 Figure 4 Test circuit for MVTU 18 relay Final setting checks Adjust the voltage setting to its functional setting and measure the pick up and drop off values as already mentioned Check that they are within the stated tolerance With the final voltage setting and the functional timer setting selected measure the operating times when a voltage 21 1x the setting voltage is applied lt 0 9 for MVTU 11 Check that this is within the stated tolerance Trip indicator and contact check Check that the trip indicator and reset facility operate Also check that the contacts operate by carrying out continuity checks Final checks Operate the relay with the trip and alarm links restored to ensure that the trip and alarm circuits are energised according to the relevant schematic diagram Remove all test leads test switches temporary shorting leads etc Replace any links that have been removed to facilitate testing If a test plug MMLB and
13. 0 Series dropper resistor None 220 1k 2 x 4 7 Rext 1 ohm in parallel DC voltage supplied for test V Relay on standby Vin V setting Current drain for relays fitted with mechanical Relay output flag mA energised Vin gt V setting Relay on standby Vin lt V setting Current drain for relays Relay output fitted with and LED LED trip trip indicator indicator operated LED trip indicator operated only Burdens for MVTU 18 definite time delayed neutral displacement voltage relay with additional timer Nominal voltage range V 30 34 48 54 110 125 DC voltage supplied for test V standby 4 38 36 5 Vin lt V setting Output relay RLI and t1 led operated on LED only 405 375 360 mA operated Output relays RL1 and RL2 and t1 and 240 140 87 t2 LEDs operated t1 and t2 LEDs only 40 36 6 99 9 operated 25 6 6 3 6 7 6 8 6 9 6 10 Measurement of the ac operating currents of the modules Monitor the ac input current by connecting an ammeter in series with one input terminal and the source This test should be done at the following input voltages 63 5V on 57 70 version of MVTU 11 amp MVTU 12 110V on 100 120V version of MVTU 11 amp MVTU 12 250V 220 250V version of MVTU 11 amp MVTU 12 415V on 380 440 version of MVTU 11 amp MVTU 12 63 5V on 57 120V version of MVTU 13 amp MVTU 18 The current through the transformer primary should be approximately 6m
14. 10 s z ixey 108 AOE uou 190916 saiddns 104 s ixey X o q 1 A uo D2 dA uo D2 dA e10 uwous sp Butuup3 Buoy o 5 910J8q YOSIG 1 JOYS C 9 euuoosip 2 q IC enu Mn Bus T 0 purum ndin 10211 ius e Aiddns 295 50 9 J 30 swaysAs JO A prjos esn 10J ZL NLAW 99 jueuie o dsip jonau dyos upJ6piq 40 45 ye AOE 1940916 sei ddns op A uo s espo 109J WOJ e1o Auo sp 4 Z Buo 9 2 oys q 8 2 j2euuoosip IK Sur e c S JON loc 1 SJODJUOD SINO ML dno ne 7 30N 296 jddns SIN i 2505 30N
15. A IF the measured current is zero suspect an open circuit primary winding series resistor or connection IF the measured current exceeds 8mA check that the external dropper resistors correctly fitted on the 220 250V and the 380 440V versions If they are correctly fitted then the primary windings may be shorted together return the module for repair Calibration information All relays are supplied precalibrated The 220 250V and the 380 440V versions of the MVTU 11 and 12 are calibrated with the external dropper resistors Rext 2 fitted on the resistor assembly supplied with the module If any external ac series resistor or the printed circuit board assembly itself is exchanged the relay will require recalibration The dc series dropper resistor 1 may be exchanged without affecting the relay calibration Repair and replacements The instructions given enable the detection of faults to sub assembly level It is recommended that any fault on the pcb should be rectified by replacement of the complete board However if any component is replaced then the relay must be recalibrated It is recommeded that the module is returned to ALSTOM T amp D Protection and Control Ltd for recalibration Should the need arise for the equipment to be returned to ALSTOM T amp D Protection amp Control Ltd for repair then the form at the back of this manual should be completed and sent with the equipment together with a copy of
16. INTO THE TEST BLOCK DANGER DO NOT OPEN CIRCUIT THE SECONDARY CIRCUIT OF A CURRENT TRANSFORMER SINCE THE HIGH VOLTAGE PRODUCED MAY BE LETHAL AND COULD DAMAGE INSULATION The test plug isolates terminals 13 amp 14 removing the dc positive making it necessary to add a link between these terminals on the test plug to restore the auxiliary supply to the relay Isolation of VT circuit Before any secondary injection tests are carried out the voltage transformer supply to the relay should be isolated by means of the panel links or connecting blocks 4 5 4 Voltage setting check The pick up and drop off voltages of the relay should be measured with the timer set to 0 15 and with the voltage setting switches set to each of the positions shown in the table below 1 switch closed left hand position O switch open right hand position Table 1 Switch position Pick up voltage VRMS MVTU 11 MVTU 11 MVTU 11 MVTU 11 MVTU12 MVTUI2 MVTU12 MVTUI2 MVIU 13 18 Switch 1 2 3 4 5 6 57 70V 100 120V 220 250 380 440V 57 70V 100 120V 220 250 380 440V 57 120V 32 62 60 230 400 105 61 5 107 5 63 110 63 110 63 110 72 125 182 5 When the switches have been set for each test the cover should be replaced to ensure that the trip indicator is always reset with the cover reset mechanism where applicable The relays should be connected as shown in the circuit diagrams Figures 1 2 and 3 Test resistor
17. MVTU 18 has 2 printed circuit boards ZJOO65 contains the measuring circuit and the circuit for timer t1 ZJO160 contains the circuit for timer t2 and the output relays for t1 and 12 21 6 5 6 6 6 6 1 6 6 2 ZJOO65 Connection 1 to terminal 13 positive dc supply Connection 2 to terminal 14 negative dc supply Connections 4 9 and 10 to pcb ZJO160 Connection 5 to terminal 27 ac input Connection 6 to terminal 28 ac input Connection 7 to pcb screen PCB ZJO160 Connections 1 2 3 and 4 to ZJOO65 Connections 5 to 10 to t1 output contacts Connections 11 to 16 to t2 output contacts Checking voltage supplies to module The dc voltage ratings available are 30 34V 48 54V 110 125V and 220 250V Where voltage sources which are higher than 30V are used external dropper resistors are connected in series with the positive supply rail Note that MVTU 18 relays do not require external dropper resistors Check that the dc supply voltage is present and that the polarity is correct between terminals 13 and 14 on the relay case terminal block when the module is removed from the case Note that when the module is in the case and the supply is connected the voltage across the terminals may be less due to the voltage drop across the external dropper resister Rext 1 if fitted Check that the ac is present between terminals 27 and 28 Check for the 220 250V and the 380 440V ac versions of the MVTU 11 and MVTU 12 that the se
18. Rext 2 The drop off voltage can be found in the same way The pick up voltage should be within 2 of the lowest setting voltage No allowance has been made for instrument errors This test has checked the calibration point of the relay The other relay settings need only be checked to see that they are functioning Refer to Tests 2 7 in Table 1 for the appropriate switch positions With the dropper resistors Rext 2 still out of circuit monitor the voltage at the relay terminals 27 and 28 for the MVTU 12 Slowly increase the voltage until the relay picks up and record the pick up value Slowly lower the voltage until the relay drops off and record the drop off value For the MVTU 11 slowly decrease the voltage to record the pick up value and then increase the voltage to record the drop off value On the MVTU 12 if the pick up voltage at the 400V setting is Z the measured pick up voltages at the other settings should be higher than the 400V setting by the amounts shown A similar method is adopted for the MVTU 11 4 5 5 Setting voltage Pick up voltage at relay input Test number V terminals 27 amp 28 V MVTU 11 MVTU 12 MVTU 11 MVTU 12 The drop off voltages should be within 5 of the pick up values MVTU 13 and MVTU 18 neutral displacement relays A series dropper resistor of approximately 50kQ should be inserted in series with the input terminals 27 and 28 to allow sufficient sensitivity in the setting range when usin
19. e electrical power to the relay contacts should be removed before checking any mechanical settings to avoid any risk of electric shock Draw out case relays Removal of the cover on equipment incorporating electromechanical operating elements may expose hazardous live parts such as relay contacts Insertion and withdrawal of extender cards When using an extender card this should not be inserted or withdrawn from the equipment whilst it is energised This is to avoid possible shock or damage hazards Hazardous live voltages may be accessible on the extender card Insertion and withdrawal of heavy current test plugs When using a heavy current test plug CT shorting links must be in place before insertion or removal to avoid potentially lethal voltages Decommissioning and Disposal Decommissioning The auxiliary supply circuit in the relay may include capacitors across the supply or to earth To avoid electric shock or energy hazards after completely isolating the supplies to the relay both poles of any dc supply the capacitors should be safely discharged via the external terminals prior to decommissioning Disposal It is recommended that incineration and disposal to water courses is avoided The product should be disposed of in a safe manner Any products containing batteries should have them removed before disposal taking precautions to avoid short circuits Particular regulations within the country of operation may apply to t
20. e flag in the latched position the white stripes on the flag should show evenly through the slots in the nameplate Adjustment is made by slackening the pcb fixing screws and moving the pcb assembly up or down as necessary then re tightening the screws After adjustment of the pcb the catch engagement must be rechecked as in ii v Allow the to drop by energising the relay coil The red stripes should show evenly through the slots in the nameplate Adjustment is made by bending the tabs one on each side of the bottom plate 27 6 10 2 Flag replacement parts 6 11 opring GT7001 001 Flag GT9009 001 Clamp plate GT2007 001 Printed circuit board 260859 Armature clip Several different makes of relay are used which require different designs of armature clip When ordering a replacement relay state that it is for use in a flag assembly and it will be supplied with the correct armature clip The armature clip is marked by a number in the moulding to indicate which make of relay it fits Make of relay Number on clip PASI GT 6008 001 HALLER 2 GT 6007 001 Replacements parts ordering information When ordering any spares please quote the relay model number and serial number as well as the printed circuit board part number Should the need arise for the equipment to be returned to ALSTHOM T amp D Protection amp Control Ltd for repair then the form at the back of this manual should be completed and sent with t
21. g a 240V variac supply see Figure 1 for the test circuit Check that the trip indicator is reset and slowly increase the ac input voltage until the trip indicator operates Record the pick up value Slowly lower the voltage checking to see when the trip indicator can be reset This is the drop off value and should be recorded Alternatively the pick up and drop off states can be determined by connecting an ohmmeter across the contacts Repeat the test for each of the settings shown in Table 1 The allowable errors on the voltage settings are 2 on the lowest setting and 4 on all other settings No allowance has been made for instrument errors The drop off value should be within 5 of the pick up value Timer setting check It is recommended that all MVTU relays are tested on the following timer settings 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 seconds The circuit diagrams for these tests are shown in Figures 1 2 and 3 The applied voltage levels should be greater than 10 above and 10 below any convenient voltage setting MVTU 11 undervoltage Remove the ac supply from 10 above the voltage setting to zero volts simultaneously starting the timer The timer stop contacts should be connected to the relay output contacts The allowable errors in the timer settings are 3 or 7Oms whichever is the greater MVTU 12 overvoltage and MVTU 13 neutral displacement Apply the ac supply from zero to 1076 above
22. he disposal of lithium batteries Technical Specifications Protective fuse rating The recommended maximum rating of the external protective fuse for this equipment is 16A Red Spot type or equivalent unless otherwise stated in the technical data section of the product documentation Insulation class 61010 1 1990 A2 Class EN 61010 1 1993 A2 Class Installation IEC 61010 1 1990 A2 Category Category Overvoltage 61010 1 1993 A2 Category Ill Environment IEC 61010 1 1990 A2 Pollution degree 2 EN 61010 1 1993 A2 Pollution degree 2 Product safety 73 23 EN 61010 1 1993 A2 EN 60950 1992 A11 1995 1995 1995 1995 1995 1995 1995 1997 This equipment requires a protective safety earth connection to ensure user safety Distribution level fixed installation Equipment in this category is qualification tested at 5kV peak 1 2 50ys 5000 0 5 between all supply circuits and earth and also between independent circuits Compliance is demonstrated by reference to generic safety standards Compliance with the European Commission Low Voltage Directive Compliance is demonstrated by reference to generic safety standards Section 1 DESCRIPTION OF SETTINGS 1 1 1 2 1 3 Voltage settings The setting voltage is determined by the positions of the six dual in line switches The sum of all the voltages shown by each respective switch pos
23. he equipment together with a copy of any commissioning test results 28 C See Note 3 b Output RLI circuits a 28 Case earth RL1 1 Y Rext 1 13 cs qU See Note 4 TF circuits n 29 4 8 Case earth connection L See Note 2 z Notes 1 a shorting links make 5 Contacts RL1 1 and RL1 2 are shown in the de energised J before b and c disconnect state Contacts will make across terminals 1 and b e Short terminals break before 3 2 and 4 for an undervoltage condition 27 28 6 Rext 2 is required for ac voltage inputs greater than 1 10V 9 ONY ie when used on low voltage 220 415V systems where T MEUS Earthing connections as shown are typical only VT sava ables Module terminal bloc 3 VT connections are typical only viewed from rear with integral case earth strap 4 Rext 1 is required only for dc supplies greater than 30V Figure 5 Application Diagram Static modular definite time delayed undervoltage relay Type MVTU 11 Output contacts ZL NLAW 991 AojeJ 9 enbi4 e QD IDAD S yppa OU 5 Ac 027 moj uo pesn al AO L 190816 sjndui 2D
24. ition and the constant value gives the required setting voltage For example an MVTU 11 with the switches set to the position shown corresponds to a setting of 32 26 58V ac lt 0 Voltage 2 gt 0 Vs 32 setting 2 lt 0 32 2 8 16 switches 2 gt 0 58V 8 lt 0 16 0 For other versions the setting method is identical Refer to the nameplate on each individual relay Time settings The time setting is selected between 0 1 and 9 9 seconds by means of the thumbwheel switches Trip indication Earlier relays were fitted with hand reset mechanical flag indicators later relays being fitted with non volatile hand reset LED trip indicators Section 2 AUXILIARY EQUIPMENT 2 1 External series resistors The following dropper resistors pre mounted on an external assembly marked with the relay serial number are supplied with each relay when required The part numbers of the assemblies are listed below together with the resistor values The 66kQ external resistor Rext 2 required only on the 380 440V versions is made up of two 15kQ and two 18kQ wirewound resistors all connected in series The 380 440V versions are initially calibrated with this external resistor assembly and if the assembly or any of the resistors on it are changed the relay must be recalibrated 2 2 2 3 2 4 Relay ac rating V 50 60Hz 57 70 100 120 220 250 380 440 57 70 100 120 220 250 380 440
25. lated and then withdraw the module assembly by the two black handles A quick inspection of the relay may result in the detection of obvious faults i e loose components or connections Otherwise proceed to the next section Connections for MVTU 11 MVTU 12 and MVTU 13 There are two classes of relay connection Firstly the external connections to the relay these are the connections between the relay terminals and the rest of the system Seconaly the printed circuit board connections these are the connections between the relay terminal block and the printed circuit board soldered connections Terminal connections Terminals 13 and 14 are connected to the positive and negative dcsupply Terminals 1 to 6 are the tripping outputs of the relay Terminals 27 and 28 are the ac input PCB connections There are six loop and bead connectors mounted on the pcb They are connected as follows Connection 1 to terminal 13 positive dc supply Connection 2 to terminal 14 negative dc supply and to pcb ZG700 Connection to pcb ZG7001 Connection 4 pcb ZG7001 Connection 5 to terminal 27 ac input Connection 6 to terminal 28 ac input Connections for MVTU 18 Terminal connections Terminals 13 and 14 are connected to the positive and negative dcsupply Terminals 1 to 6 are the tripping outputs from timer t1 Terminals 7 to 12 are the tripping outputs from timer t2 Terminals 27 and 28 are the ac Input PCB connections The
26. mechanism where fitted Setting up procedure for the flag assembly Flag replacement parts Replacements parts ordering information COMMISSIONING TEST RECORD REPAIR FORM 20 20 20 20 20 21 21 21 22 22 22 22 26 26 26 26 26 27 28 28 33 35 SAFETY SECTION This Safety Section should be read before commencing any work on the equipment Health and safety The information in the Safety Section of the product documentation is intended to ensure that products are properly installed and handled in order to maintain them in a safe condition It is assumed that everyone who will be associated with the equipment will be familiar with the contents of the Safety Section Explanation of symbols and labels The meaning of symbols and labels which may be used on the equipment or in the product documentation is given below N Caution refer to product documentation Caution risk of electric shock Functional earth terminal Note this symbol may also be used for a protective safety earth terminal if that terminal is part of a terminal block or sub assembly eg power supply e Protective safety earth terminal Sa Note The term earth used throughout the product documentation is the direct equivalent of the North American term ground Installing Commissioning and Servicing Equipment connections Personnel undertaking installation commissioning or servicing work on this equipment should be
27. mplementary metal oxide silicon CMOS components are used which require extremely careful handling Damage can be caused to the printed circuit track unless extreme is used in the replacement of components Replacement of some components will necessitate recalibration of the relay The printed circuit boards are covered with a protective coating of polycoat which makes access to tracks and components very difficult Test equipment required for fault finding Equipment required for fault finding is minimal and consists of the following Digital multimeter with ranges of 1000V ac dc and 0 1A ac dc DC voltage supply 30V 0 5A AC voltage source 0 500V 50Hz at 1OmA Oscilloscope optional Relay tool kit 20 6 2 6 3 6 4 General procedure and precautions Care must be taken when making test connections to printed circuit boards to avoid short circuiting or damaging the copper tracks Before connecting or disconnecting any test equipment the relay must be isolated the supply Relevant schematic diagrams MVTU 11 Undervoltage FIOMVTU 11 501 Figure 5 MVTU 12 Overvoltage FIOMVTU 12 501 Figure 6 MVTU 13 Neutral displacement FIO MVTU 13 501 Figure 7 MVTU 18 Neutral displacement F10 MVTU 18 501 Figure 8 Inspection removal of module from case Unscrew the two front cover screws and remove the clear plastic front cover Ensure that the dc supply is iso
28. n exposed to humid conditions and may be restored by gently heating the bag for about an hour prior to replacing it in the carton Dust which collects on a carton may on subsequent unpacking find its way into the relay in damp conditions the carton and packing may become impregnated with moisture and the de humidifying agent will lose its efficiency Storage temperature 25 to O C Siting The installation should be clean dry and reasonably free from dust and excessive vibration The site should preferably be well illuminated to facilitate inspection An outline diagram is normally supplied showing panel cut outs and hole centres For individually mounted MVTU relays these dimensions will also be found in Publication 6041 Section 4 COMMISSIONING TESTS 4 1 4 1 1 4 2 4 3 4 4 Note Earlier relays were fitted with hand reset mechanical flag indicators later relays being fitted with a non volatile hand reset LED trip indicator CAUTION If a flag indicator is fitted damage is likely to be incurred if the flag indicator armature assembly of a miniature relay is actuated manually with a screwdriver probe Flags should always be reset with the cover in position by the mechanism provided Inspection and wiring check Carefully examine the module and case to see that no damage has occurred during transit Check that the relay serial number on the module case cover and resistor assembly when an assembly is req
29. ne to measure these burdens Typical values for the dc burdens are shown in the following tables for the MVTU 11 12 13 and 18 Burdens for MVTU 11 definite time delayed undervoltage relay Nominal voltage range V 30 34 48 54 110 125 220 250 Series dropper resistor None 220 1k Rext 1 ohm in parallel DC voltage supplied for test V Current drain for relays fitted with mechanical flag mA Current drain for relays fitted with LED trip indicator mA 2 x Ak7 Relay on standby Vin gt V setting Relay output energised Vin V setting Relay on standby Vin gt V setting Relay output and LED trip indicator operated LED trip indicator operated only 23 Burdens for MVTU 12 definite time delayed overvoltage relay Nominal voltage range V 30 34 48 54 110 125 220 250 Series dropper resistor Rext 1 ohm 2 x Ak7 in parallel None 220 1k DC voltage supplied for test V 220 Current drain for relays fitted with mechanical flag mA Current drain for relays fitted with LED trip indicator mA Relay on standby 28 76 Vin lt V setting Relay output energised Vin gt V setting Relay on standby Vin lt V setting Relay output and LED trip indicator operated LED trip indicator 73 operated only 24 Burdens for MVTU 13 definite time delayed neutral displacement voltage relay Nominal voltage range V 30 34 48 54 110 125 220 25
30. ntial Shaking hands achieves equipotential Place the module on an antistatic surface or on a conducting surface which is at the same potential as yourself Store or transport the module in a conductive bag More information on safe working procedures for all electronic equipment can be found in BS5783 and IEC 60147 OF IF you are making measurements on the internal electronic circuitry of an equipment in service it is preferable that you are earthed to the case with a conductive wrist strap Wrist straps should have a resistance to ground between 500k 10M ohms If a wrist strap is not available you should maintain regular contact with the case to prevent the build up of static Instrumentation which may be used for making measurements should be earthed to the case whenever possible ALSTOM T amp D Protection amp Control Ltd strongly recommends that detailed investigations on the electronic circuitry or modification work should be carried out in a Special Handling Area such as described in 55783 or IEC 60147 OF 4 5 1 4 5 2 4 9 3 4 5 4 4 5 5 4 5 6 2 9 7 4 5 8 TYPES MVIU 11 Definite Time Delayed Undervoltage Relay MVTU 12 Definite Time Delayed Overvoltage Relay MVTU 13 Definite Time Delayed Neutral Displacement Relay MVTU 18 Definite Time Delayed Neutral Displacement Relay with Additional Timer CONTENTS SAFETY SECTION DESCRIPTION OF SETTINGS Voltage settings Time settings Trip indication
31. ontrol Ltd St Leonards Works Stafford ST17 4LX England Tel 44 0 1785 223251 Fax 44 0 1785 212232 Email enquiries pcs alstom co uk Internet www gecalsthomgpc co uk 1998 ALSTOM T amp D Protection amp Control Ltd Our policy is one of continuous product development and the right is reserved to supply equipment which may vary from that described Publication R8041J Printed in England
32. ries resistors are fitted in series with the ac supply terminals Printed circuit board tests IF all the connections are intact and the supplies are of the correct voltage and polarity it is likely that the fault will lie somewhere on the pcb Proceed to the next two sections to try to confirm this Monitoring of the voltage across relay coil Set the thumbwheel switches to O 1 seconds Connect an electronic voltmeter across pcb 20062 connection and 4 to monitor the output signal Adjust the ac input to an amplitude lower and then higher than the relay setting voltage The output voltage should change from zero to approximately 24 for the overvoltage MVTU 12 and the neutral displacement MVTU 13 version and from approximately 24 to zero for the undervoltage MVTU 11 version Measurement of the dc operating currents of the modules By monitoring the dc operating current of a module a good indication is provided that the module is connected correctly and that the dc power supply section is operating correctly if the current measured lies within about 10 of the specified value Allowances must be made for supply voltages deviating from the lower rated voltage as this has a significant effect on the dc burden These dc burden tests should be carried out in the operated and non operated state that is with the ac input both above and below the voltage setting level 22 An ammeter should be connected in the positive supply li
33. rtons specifically designed to protect them from damage Inspection Relays should be examined immediately they are received to ensure that no damage has been sustained in transit If damage due to rough handling is evident a claim should be made to the transport company concerned immediately and the nearest ALSTOM T amp D Protection amp Control representative should be promptly notified Relays which are supplied unmounted and not intended for immediate installation should be returned to their protective polythene bags Unpacking Care must be taken when unpacking and installing the relays so that none of the parts is damaged or their settings altered they should only be handled by skilled persons Relays should be examined for any wedges clamps or rubber bands necessary to secure moving parts to prevent damage during transit and these should be removed after installation and before commissioning Relays which have been removed from their cases should not be left in situations where they are exposed to dust or damp This particularly applies to installations which are being carried out at the same time as constructional work Storage IF relays are not installed immediately upon receipt they should be stored in a place free from dust and moisture in their original cartons and where de humidifier bags have been included in the packing they should be retained The action of the de humidifier crystals will be impaired if the bag has bee
34. s Current transformer circuits Do not open the secondary circuit of a live CT since the high voltage produced may be lethal to personnel and could damage insulation External resistors Where external resistors are fitted to relays these may present a risk of electric shock or burns if touched Battery replacement Where internal batteries are fitted they should be replaced with the recommended type and be installed with the correct polarity to avoid possible damage to the equipment Insulation and dielectric strength testing Insulation testing may leave capacitors charged up to a hazardous voltage At the end of each part of the test the voltage should be gradually reduced to zero to discharge capacitors before the test leads are disconnected Insertion of modules and pcb cards These must not be inserted into or withdrawn from equipment whilst it is energised since this may result in damage Fibre optic communication Where fibre optic communication devices are fitted these should not be viewed directly Optical power meters should be used to determine the operation or signal level of the device gt gt e gt gt gt Older Products Electrical adjustments Equipments which require direct physical adjustments to their operating mechanism to change current or voltage settings should have the electrical power removed before making the change to avoid any risk of electric shock Mechanical adjustments Th
35. test block MMLG have been used remove the test plug CAUTION Replace the test block cover to put the protection in service 19 Section 5 MAINTENANCE 5 1 5 2 Periodic maintenance is necessary However periodic inspection and test is recommended Visual inspection Isolate all supplies and withdraw the module from the case using the two black handles on the relay Inspect the printed circuit board for any sign of loose components or connections Note that where fitted flag mechanisms should not be disturbed unless found to be operating incorrectly during the routine function tests Your attention is drawn to the fact that the relay can be damaged by electrostatic discharges The pcb should not be touched unless precautions have been taken Functional checks Periodic function tests should be carried out using the test procedures shown in the commissioning section The operation of the trip indicator and the reset facility should be checked during these functional tests Section PROBLEM ANALYSIS 6 1 These instructions enable a fault to be localised to sub assembly level Fault finding to component level is not recommended The main reasons for this are as follows Fault finding on printed circuit boards requires the use of specialised knowledge and equipment Components used in manufacture are subject to strict quality control and in certain cases selected for particular characteristics Co
36. uired are identical and that the model number and rating information are correct Check that the external wiring is correct to the relevant relay diagram or scheme diagram The relay diagram number appears inside the case Particular attention should be paid to the wiring of the external resistors Rext 1 and Rext 2 to the relay if required on scheme Electrostatic discharges ESD The relay uses components which are sensitive to electrostatic discharges When handling the module care should be taken to avoid contact with components and electrical connections When removed from the case for storage the module should be placed in an electrically conducting anti static bag See full recommendations inside the front cover of this manual Connection of the MMLG test block If a test block MMLG is provided the connections should be checked to the scheme diagram particularly that the supply connections are to the live side of the test block coloured orange the odd numbered terminals The auxiliary supply voltage to the scheme should be routed via the test block terminals 13 and 15 To facilitate ease of wiring the MMLG should be located at the right hand side of the assembly Earthing Ensure that the case earthing connection above the rear terminal block is used to connect the relay to the local earth bar Insulation check The relay and its associated wiring may be insulation tested between all electrically isolated circuits

Service Manual Type MVTU Definite Time Delayed Relays

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