Type MRTP

Supervision for AC Pilot Circuits

Service Manual

R8026F

CONTENTS

1 INSTALLATION 31.1 General considerations 31.2 Relay mounting 31.3 Unpacking 31.4 Storage 3

2 COMMISSIONING 42.1 Electrostatic discharges (esd) 42.2 Inspection 42.3 Wiring 42.4 Earthing 42.5 Insulation 42.6 Electrical tests 4

3 MAINTENANCE 7

4 PROBLEM ANALYSIS 74.1 DC circuits 74.2 AC circuits 94.3 Injection filter (MRTP 01 and MRTP 02) 9

5 SPARES 10

6 CALIBRATION AND TEST 10

7 COMMISSIONING TEST RECORD 11

REPAIR FORM 15

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Section 1 INSTALLATION

1.1 General considerations

Protective relays, although generally of robust construction, require carefultreatment prior to installation on site. Upon receipt, relays should be examinedimmediately, to ensure no damage has been sustained in transit.

When handling a relay, great care must be taken, particularly when the relay iremoved from its case. Touching the printed circuit board should be avoided, metal oxide semiconductor (mos) devices are used, which can be damaged belectrostatic discharges.

If damage has been sustained in transit, a claim should be made to the transpcontractors and AREVA T&D Limited should be promptly notified. Relayswhich are supplied unmounted and are not intended for immediate installationshould be returned to their protective polythene bags.

1.2 Relay mounting

Relays are despatched either individually or as part of a panel/rack mountingassembly. If the relays are to be installed into a panel/rack assembly after recthen construction details can be found in Publication R-7012.

For individually mounted relays an outline diagram is normally supplied showipanel cut-outs and hole centres, these dimensions will also be found in PublicR-6102.

1.3 Unpacking

Care must be taken when unpacking and installing the relays to avoid damagethey must at all times be handled by skilled persons only. The installation shoclean, dry and reasonably free from dust and excessive vibration. The site showell lit to facilitate inspection.

Relays which have been removed from their cases should not be left in situatiwhere they are exposed to dust or damp. This particularly applies to installatiowhich are being carried out at the same time as construction work.

1.4 Storage

If relays are not installed immediately upon receipt they should be stored in a free from dust and moisture in their original cartons and where de-humidifier bhave been included in the packing they should be retained. The action of thede-humidifier crystals will be impaired if the bag has been exposed to ambienconditions and may be restored by gently heating the bag for about an hour, preplacing it in the carton.

Dust which collects on a carton may, on subsequent unpacking, find its way inrelay; in damp conditions the carton and unpacking may become impregnatedmoisture and the de-humidifying agent will lose its efficiency. Storage tempera–25°C to +70°C.

Page 3

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Section 2 COMMISSIONING

2.1 Electrostatic discharges (esd)

The relay uses components which are sensitive to electrostatic discharges. Whandling the module, care should be taken to avoid contact with components electrical connections. When removed from the case for storage, the module be placed in an electrically conducting anti-static bag. Full handling guidelinesgiven inside the front cover of this manual.

2.2 Inspection

Carefully examine the module and case to see that no damage has occurred transit. Check that the relay serial numbers on the module, case and cover aridentical, and that the model number and rating information are correct. Carefremove any elasticbands/packing fitted for transportation purposes.

2.3 Wiring

Check that the external wiring is correct to the relevant relay diagram or schemdiagram. The relay diagram number appears inside the case.

Particular attention should be paid to the correct wiring and value of any exterresistors indicated on the wiring/relay rating information.

Note that the shorting switches on the relay diagram are fitted internally acrosrelevant case terminals and close when the module is withdrawn. It is essentisuch switches are fitted across all ct circuits.

If test block type MMLG is provided, the connections should be checked to thscheme diagram, particularly that the supply connections are to the live side otest block (coloured orange) and with terminals allocated with odd numbers (17 etc.). The auxiliary supply voltage to the scheme should be routed via test bterminals 13 and 15.

2.4 Earthing

Ensure that the case earthing connection above the rear terminal block, is useconnect the relay to the local earth bar.

2.5 Insulation

The relay and its associated wiring may be insulation tested between:

(i) all electrically isolated circuits.

(ii) all circuits and earth.

An electronic or brushless insulation tester should be used, having a dc voltagexceeding 1000V. Accessible terminals of the same circuit should be first stratogether. Deliberate circuit earthing links, removed for the tests, subsequentlybe replaced.

2.6 Electrical tests

DANGER:

DO NOT OPEN CIRCUIT THE SECONDARY CIRCUIT OF A CURRENTTRANSFORMER SINCE THE HIGH VOLTAGE PRODUCED MAY BELETHAL AND COULD DAMAGE INSULATION.

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When type MMLG test block facilities are installed, it is important that the sockin the type MMLB01 test plug, which correspond to the current transformersecondary windings, are LINKED BEFORE THE TEST PLUG IS INSERTEDINTO THE TEST BLOCK. Similarly, a MMLB02 single finger test plug must beterminated with an ammeter BEFORE IT IS INSERTED to monitor ct secondarcurrents.

The instructions have been written assuming that not all schemes are fitted wittest block . Where a test block is used, the procedure is generally correct, howwill be necessary to determine the test block terminals for applying the voltagemonitoring relay operation from the scheme drawing.

– MMLB multi-way test plug, for MMLG test block (where fitted).

– Multi-range ammeter.

– Short (8") leads with 4mm plugs at each end: up to 26, ie.13 for each line mneeded.

When the protection scheme incorporates pilot supervision, there will be a MRor MRTP 03 relay provided at the local line end and a MRTP 02 relay at the reline end. When correctly connected and energised from the appropriate ac volthe relay will inject a dc supervision supply across a capacitor in series with thepilots. For 5kV pilots the capacitor is in the MRTP 01 relay, for 15kV pilots aMRTP 03 relay is used with the capacitor housed with the 15kV isolatingtransformer. The commissioning instruction for both types are given below, firsfor the 5kV version.

2.6.1 Monitor the current which should flow in the pilot using a dc milli-ammeter.

2.6.2 Apply the appropriate ac supply for the supervision circuit, and the normal dcsupply.

2.6.3 Note the reading on the dc milli-ammeter. This current should be approximate1.2mA dc and is the current flowing in the pilots.

2.6.4 On the MRTP 01 and MRTP 03 relays there are three red led indicators and aled indicator. The latter is primarily intended as an aid during the setting of theadjustable resistor marked SET (see 2.6.6 to 2.6.8). The top red led is to indicafailure of the ac supervision supply. The middle red led indicator is to indicate pfail open circuit whilst the lower one is to indicate pilot fail short circuit. If any othese indicators are operated, resetting should be attempted by pressing the rebutton.

Assuming that ac and dc supplies are present, the ac supervision supply fail inshould reset when the reset push button is pressed. Failure to reset is almostinvariably due to the absence of correct ac or dc supplies.

2.6.5 The pilot fail indicators may be in the operated or reset state but in both condiset the adjustable resistor as detailed in the following tests.

2.6.6 The adjustable resistor is changed by the use of a small screwdriver through ain the front plate marked SET. There is a worm drive to the resistor so that a lanumber of complete turns (approx. 25) is needed to completely adjust the resisTo facilitate the setting of the pilot supervision there is a test push button whichdepressed reduces the supervision band width inside which the pilots are conshealthy.

2.6.7 If it is considered desirable to monitor the position of the normally open contacthe pilot fail relay, connect a multimeter across terminals 1 & 3 or 2 & 4, which

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2.6.8 Adjust as follows:

2.6.8.1 With the screwdriver engaging the worm drive of the SET resistor, turn it clockfor 30 complete turns. The pilot fail open circuit red led indicator should now boperated, the green led lit and the contacts closed. If the green led is out and tcontacts open, check that the dc and ac supplies are present.

2.6.8.2 Turn the screwdriver anti-clockwise until either the green led goes out and thecontacts open and the worm drive has been turned 30 complete turns. In the lcase, where the contacts have not opened, confirm that test 2.6.3 is definitelysatisfactory (a low dc current in the pilots indicates that the pilot resistance is mhigher than the limit of 1000 ohms) also check the dc supply. If both these cheare satisfactory, reference should be made to the fault finding instructions.

2.6.8.3 Reset the pilot fail circuit red led.

2.6.8.4 Depress the test button (which closes the supervision zone) the green led shocome on. With the test button held depressed, slowly turn the screwdriver anticlockwise until the green led extinguishes. Release the test button

2.6.8.5 Depress the test button again, the green led should not illuminate. Release thbutton. The pilot supervision is now correctly set.

2.6.8.6 Replace the relay cover and press the reset button.

2.6.8.7 It is advisable to check that if the pilots are open circuit that the green led cominstantaneously and the pilot fail open circuit indicator operates after approxim10 seconds. After restoring the pilots to normal reset the pilot fail open circuitindicator.

2.6.8.8 Check that if the pilots are short circuit, the green led comes on instantaneouthe pilot fail short circuit indicator operates after approximately 10 seconds. Afrestoring the pilots to normal, reset the pilot fail short circuit indicator.

2.6.8.9 Confirm that removal of ac supply operates the supervision supply fail indicatafter a delay of approximately 10 seconds. Approximately 5 seconds afterrestoration of the ac supply it should be possible to reset the supervision suppindicator.

This completes the tests on the supervision module. Disconnect themilli-ammeter from the pilots and restore pilot connections.

2.6.9 Where external matching/isolating transformers are used, the injection filters(comprising a capacitor, bridge rectifier and resistors) are assembled as part otransformers. The ac output from the MRTP 03 is taken from the rear terminalthe relay into a supervision isolating transformer and then to the injection filterthe isolating transformer. The supervision unit therefore supervises the pilotsbetween the isolating transformers and each line end. It would not be satisfactthere were any further isolating transformers in the pilot circuit since supervisiorelies on the circulation of dc around the complete pilot loop.

The testing procedure is generally similar to that described above except that milli-ammeter will need to be connected directly in series with the pilots, betwethe isolating transformers at each line end.

Page 6

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Section 3 MAINTENANCE

Periodic maintenance is not necessary. However, periodic inspection and test isrecommended.

Routine testing of the relay can be performed by the secondary injection methoddetailed in the commissioning instructions.

During testing, the led indicators should be checked for operation. Operation of relay contacts should coincide with the respective led indicator illuminating.Check that operation is clean with no tendency to stick. Check also that the flagbe reset using the reset push button mounted in the relay cover.

Removal of the relay from its case.

To remove the relay from its case, loosen the cover nuts and remove the cover.The relay can now be slid out of the case by pulling on the handles.

Miniature printed circuit mounted relay The pcb mounted hinged armature relashould not require any maintenance andunless the unit is not operating correctly ishould be left undisturbed. The operationof the relay may be checked duringroutine injection tests.

Repair and replacements The pcb mounted hinged armature relcannot be repaired. If it is not operatingcorrectly the complete unit must bereplaced. Where possible we recommendthe complete module is returned toAREVA T&D for repair.

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Section 4 PROBLEM ANALYSIS

The supervision circuit supplies an ac voltage to the injection filter, which thenrectifies the ac and feeds the resulting dc into the pilot circuit. The injection filcould fail resulting in open circuit pilots, which would also cause the differentirelay to operate incorrectly, otherwise any failure will only cause incorrect fauindication.

It is recommended that printed circuit boards are replaced as a whole and thaattempt should be made to remove and replace components on a printed circboard. This preserves the coating on the printed circuit boards, and prevents damage to the coating due to soldering etc.

For the above reason, the fault finding instructions do not go into detailedinstructions to fault find to component level.

NOTE: The MRTP 01 contains both the supervision circuits and injection filteThey can be tested separately by reference to the appropriate section

4.1 DC circuits

4.1.1 Apply dc voltage as stated below via a dc milli-ammeter meter to case terminand 14 or TP10 and TP9, if any red led is illuminated press the reset push buany led remains illuminated the printed circuit board is faulty. Neither RL4 or R

Page 7

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should operate for at least 6 seconds from application of the dc supply. The cudrawn from the supply without RL4 or RL5 operated is:

Auxiliary Voltage Current

Rated Applied

30/34V 30V 10mA

48/54V 50V 20mA

110/125V 125V 20mA

Table 4.1

If this current is not obtained, the printed circuit board is faulty.

4.1.2 Leave the dc voltage applied. After 6 to 10 seconds the supply fail relay RL5 soperate, the current will increase to:

Auxiliary Voltage Current

Rated Applied

30/34V 30V 100mA

48/54V 50V 70mA

110/125V 125V 50mA

Table 4.2

If this current is not obtained, or the relay fails to operate check the timer circuiSection 4.1.4. If the relay RL5 operates immediately the dc is applied, the printcircuit board is faulty.

4.1.3 Apply rated ac voltage to case terminals 27 and 28.

Check the supply fail relay resets. The current drawn by the relay should be asin Table 4.1.

Check the supply fail led maybe reset.

After approximately 5 seconds the pilot fail relay should pick up and the pilot faopen circuit led should illuminate. The current taken by the relay should be asindicated in Table 4.2.

Probable areas of a fault are:

4.1.3.1 If the supply fail relay fails to drop off, then T2 or the ac circuit on the printedcircuit board are faulty.

4.1.3.2 If the supply fail relay operates correctly, but the pilot fail relay does not, the fain either the pilot fail relay, T3 or the ac circuit on the printed circuit board.

4.1.3.3 If both relays operate correctly the fault is in either T3 or the ac circuits on theprinted circuit board.

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4.2 AC circuits

4.2.1 T2

4.2.1.1 Apply rated ac voltage via an ac milli-ammeter to case terminals 27 and 28. Mthe current flowing into the relay.

Rated ac voltage Current

110V 50mA

127V 50mA

220V 50mA

240V 50mA

260V 50mA

Table 4.3

If this value of current is not obtained the fault is in T3 or the measuring circuit.

4.2.1.2 With rated ac applied, measure the voltage on TP2 and TP3, this should beapproximately 58V. If this value is obtained the fault is in the measuring circuit

4.2.1.3 Disconnect the secondary of T2 from the printed circuit board measure thesecondary voltage on the wires from the transformer; this should be approxima58V. If this value is obtained the fault is in the measuring circuits.

4.2.2 T3

4.2.2.1 With rated ac applied, measure the ac voltage on TP3 and TP4, this should bapproximately 30V. If this value is obtained the fault is in T3 or the injection filtif fitted.

4.2.2.4 Disconnect the primary of T3 from the printed circuit board and repeat test 4.2The value measured should still be approximately 30V. If it is not, the printed cboard is faulty.

4.3 Injection filter (MRTP 01 and MRTP 02)

For MRTP 01 relays, if the fault is located in T3 or the injection filter, theconnections between the secondary of T3 and the injection filter rectifier bridgemust be broken, and the tests below performed to prove the injection filter.

4.3.1 Apply 20V at rated frequency to case terminals 19 and 20. Connect a dcmilli-ammeter to case terminals 17 (+ve) and 18. The reading should be 2.3 to2.9mA.

If the current is low the fault is either a short circuit in one of the capacitors, ancircuit in the resistor or the bridge rectifier.

If the current is high the resistor is faulty or has been shorted.

4.3.2 Replace the dc milli-ammeter with a dc voltmeter and repeat 4.3.1. The readinshould be 25-30 volts.

If the voltage is low either the rectifier is faulty, the resistor is open circuit or onthe capacitors is leaking.

4.3.3 Disconnect the ac supply from terminals 19 and 20 and inject 100mA at ratedfrequency into terminals 17 and 18. Measure the ac voltage across terminals 118, this should be between 5 and 8V.

Page 9

If the voltage is less than 5V, then one of the 3 parallel capacitors is leaky.

If the voltage is greater than 8V one of the capacitors is open circuit.

4.3.4 Repeat test 4.3.2 measuring the voltage across the dc terminals of the bridgerectifier; this should be approximately 27V.

If the voltage is less than 27V the bridge rectifier is faulty.

4.3.5 Measure the value of R1, this should be 10k ohms.

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Section 5 SPARES

When ordering spare parts, the serial number and full model number of the relashould be included with the order.

Repairs

Should the need arise for the equipment to be returned to AREVA T&D Ltd. forrepair, then the form at the back of this manual should be completed and sent withthe equipment together with a copy of any commissioning test results.

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Section 6 CALIBRATION AND TEST

It is not necessary to calibrate the relay after replacement of any part other thaprinted circuit board. If the printed board is at fault the complete relay should bereturned toAREVA T&D Ltd.

The relay should be commissioned before being put back into service.

Page 10

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Section 7 COMMISSIONING TEST RECORD

MRTP AC PILOT CIRCUIT SUPERVISION RELAY

Site ___________________________ Circuit __________________________

Model no. ______________________ Serial No. _______________________

Rating AC V(n)_________________ V Diagram_________________________

DC V(x)_________________ V

1. Check Supplies – AC V(n) ______________________________________

– DC V(x) ______________________________________

2. Monitor pilot current ______________________________________

3. Set adjustable resistor ______________________________________

4. Monitor pilot fail contacts ______________________________________

5. Check indications ______________________________________

Pilot fail open circuit – instantaneous ________________________________ (green l

– 10s delay ________________________________ (red led

Pilot fail short circuit - instantaneous ________________________________ (green l

– 10s delay ________________________________ (red led

6. Check supervision supply fail ________________________________ (red led

Remarks:

__________________________________ ______________________________

Commissioning Engineer Customer Witness

__________________________________ ______________________________

Date Date

Page 11

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✁

continued overleaf

REPAIR FORM

Please complete this form and return it to AREVA T&D Ltd with the equipment to berepaired. This form may also be used in the case of application queries.

AREVA T&D LimitedSt. Leonards WorksStaffordST17 4LX,England

For: After Sales Service Department

Customer Ref: __________________ Model No: ________________

AREVA 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?

___________________________________________________________________

___________________________________________________________________

___________________________________________________________________

___________________________________________________________________

Page 15

____

____

____

____

____

____

____

____

____

____

____

____

____

_____

_____

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

Page 16

✁

AREVA T&D's Automation & Information Systems Business www.areva-td.com T&D Worldwide Contact Centre online 24 hours a day: +44 (0) 1785 25 00 70 http://www.areva-td.com/contactcentre/

Pub

licat

ion:

R80

26F