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Technical Guide
Testing self-powered relays with SVERKER 900

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Figure 25. MTT Pre-fault and fault sequence for the presence of load before the fault and test results.

Figure 26. MTT Pre-fault and fault sequence for simulation of no presence of load before the fault and test
results (switch onto fault).

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Summary of Contents for SVERKER 900

Page 1: ...megger com ZR CR15E Doc CR036201AE V01 Sept 2020 Page 1 33 Testing self powered relays with SVERKER 900 Authors Andrea Bonetti Megger Sweden AB Klaus Spitzenberg Megger GmbH Germany Lennart Schotteniu...

Page 2: ...Technical Guide Testing self powered relays with SVERKER 900 Page 2 33...

Page 3: ...PHASE OVERCURRENT RELAY 12 5 2 1 Relay settings 12 5 2 2 Connecting SVERKER 900 to WIC 1 relay 13 5 2 3 SVERKER 900 settings 14 5 2 4 Testing the overcurrent protection function 15 5 2 5 Can we accept...

Page 4: ...es and hopefully one day will be able to deliver energy to the grid V2G 2 2 More technically smart grids penetrates all the voltage levels One of the important factors that will affect the speed of th...

Page 5: ...nd it is induced back to the analog inputs of the relay From that current the relay draws the energy to power itself Figure 2 The line feeder must be de energized no primary current shall flow into th...

Page 6: ...lt current for a certain period before the fault current is really injected In SVERKER 900 this means that the pre fault and fault instrument shall be used where the pre fault currents are set at a ce...

Page 7: ...er to apply the standardized test methodologies end users for procurement specification acceptance tests the entire relay protection community in general as well as for commissioning testing engineers...

Page 8: ...st of the border it is intended to verify the accuracy of the border of the relay characteristic For overcurrent relays the characteristic is defined by the start value pick up value5 the current thre...

Page 9: ...imes at values smaller than 1 3 times the threshold but remember that in case of discussions the IEC 60255 151 requires to test the operate time at least at 1 3 times the start value if no other value...

Page 10: ...is document is W1C1 W2AS1 Figure 6 and Figure 7 The selected nominal primary current Is will be chosen to be 20 A Figure 6 The multi winding CT of type W1C1 W2AS1 The relay settings are made with dips...

Page 11: ...user s manual pages 20 21 and 22 5 Copyright SEG GmbH their position in the tested relay and list of different CTs The Normal Inverse characteristic for WIC 1 relay is the standardized curve A Invers...

Page 12: ...ent to 50 A primary current I _test 30 A x 1 50 0 6 A Characteristic Normal Inverse Time Multiplier a 0 3 I _test 200 A x 1 50 4 0 A Characteristic Definite Time Time Delay t 200 ms The table below re...

Page 13: ...rms that no matter which current transformer is used the base value of the secondary test current is 0 4 A Figure 10 Figure 10 No matter which current transformer is used the windings are arranged in...

Page 14: ...input nr 18 of SVERKER 900 needs to be configured in such a way to be able to manage the voltage trip signal from WIC 1 Voltage sensing trigger on voltage presence from 0 to 1 DC voltage threshold 20...

Page 15: ...s as shown in Figure 12 5 2 4 Testing the overcurrent protection function Considering the information in par 5 2 3 set up the necessary conditions in SVERKER 900 and run the sequence of tests10 Before...

Page 16: ...gure 15 Figure 15 First fault of 0 8 A timeout after 10 seconds in MTT pre fault and fault Select MTT by tapping on its button MTT is now armed Figure 16 Figure 16 Activation arming of the MTT mode in...

Page 17: ...w 4A threshold for I for testing the non trip of the I threshold par 4 1 3 In this case tests slightly above 4A have been done but the test results were well in line with the expected values so there...

Page 18: ...he test current see par 5 2 1 The procedure is very intuitive Figure 21 Adding the reference curve for I and I Tap on to see the result on a larger graph Figure 22 Figure 22 Viewing the test results g...

Page 19: ...ings 10 above and 10 below the real settings In this case we obtain two curves that reasonably show the error in the time characteristic When the error for the measured current is below the injected v...

Page 20: ...ault fault current of 7 A above I threshold of 4 A Remember please that those current values are always referred to the test current It is always good to have in mind the primary values associated to...

Page 21: ...KER 900 Page 21 33 Figure 25 MTT Pre fault and fault sequence for the presence of load before the fault and test results Figure 26 MTT Pre fault and fault sequence for simulation of no presence of loa...

Page 22: ...fault Fault 7 A 1 202 ms 216 ms 2 203 ms 215 ms 3 203 ms 216 ms 4 202 ms 215 ms 5 203 ms 215 ms AVERAGE 202 6 ms 215 4 ms We can conclude that the additional time required by WIC 1 to start up some 1...

Page 23: ...nce conditions this test enables a self testing self supervision through a special procedure that tests the tripping circuit and other signals Figure 27 Figure 27 Procedure for testing the tripping ci...

Page 24: ...hen press Enter again until selected value comes up When I value is set press again to to set Characteristic repeate above to select If password is still valid only press Enter until selected choise c...

Page 25: ...user s manual 4 Copyright SEG GmbH 6 2 3 SVERKER 900 settings For testing the phase overcurrent protection function the instrument MTT 12 of pre fault and fault and the possibility to draw graphs of t...

Page 26: ...ressing the knob Once the operate time is recorded by the SVERKER 900 just rotate the knob to change the fault level and press it again to inject it Until you have finished with the sequence of tests...

Page 27: ...5 A timeout after 20 seconds in MTT pre fault and fault Figure 32 Activation arming of the MTT mode in pre fault and fault Press the knob to start the injection To stop the sequence of tests tap At th...

Page 28: ...n phase L1 If this time elapses without that the injection has occurred the procedure must be started again from the relay HMI Before preparing the relay for this test prepare the SVERKER 900 connecti...

Page 29: ...tton on relay HMI to acknowledge that the test is terminated just follow the instructions that the relay proposes through its screen A simple video clip 14 shows the self testing procedure in WIP 1 re...

Page 30: ...ure 38 For repeating the tests MTT in pre fault and fault instrument has been used Different approaches are of course possible Figure 37 MTT Pre fault and fault sequence for the presence of load befor...

Page 31: ...negligible compared to the operate time when the load current is available before the fault Switch onto fault condition or fault in unloaded feeders does not create any noticeable extra time delay in...

Page 32: ...nput Output IEC TC JWG 17 Documentation of communication in power utility automation https www linkedin com in bonetti andrea 8 2 Klaus Spitzenberg Klaus is training manager and application expert at...

Page 33: ...luation of distance protection relays in 2016 IEEE PES Transmission and Distribution Conference and Exposition T D May 2016 pp 1 6 doi 10 1109 TDC 2016 7520031 8 IEC 60255 151 2009 IEC Webstore https...

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