Megger SVERKER 900 Technical Manual
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Megger SVERKER 900 Technical Manual

Testing self-powered relays
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Technical Guide
Authors:
Andrea Bonetti; Megger Sweden AB
Klaus Spitzenberg, Megger GmbH, Germany
Lennart Schottenius; Megger Sweden AB
Stefan Larsson; Megger Sweden AB
Date:
September 2020
Version:
First edition
Copyright Megger Sweden AB – September 2020
Megger Sweden AB, Danderyd, Sweden
T +46 8 510 195 00 E seinfo@megger.com
Technical support
support.sweden@megger.com
Testing self-powered relays
with SVERKER 900
www.megger.com
ZR-CR15E  Doc. CR036201AE V01  Sept. 2020
Page 1(33)

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Summary of Contents for Megger SVERKER 900

  • Page 1 Date: September 2020 Version: First edition Copyright Megger Sweden AB – September 2020 Megger Sweden AB, Danderyd, Sweden T +46 8 510 195 00 E seinfo@megger.com www.megger.com ZR-CR15E  Doc. CR036201AE V01  Sept. 2020 Page 1(33) Technical support support.sweden@megger.com...
  • Page 2 Technical Guide Testing self-powered relays with SVERKER 900 Page 2(33)

  • Page 3: Table Of Contents

    Standardized IEC inverse time curves ........................7 4.1.2. The “Time Multiplier”, TMS............................8 4.1.3. Testing the start value and the operate time......................8 TESTING WIC-1 OVERCURRENT RELAY WITH SVERKER 900..............10 5.1....................................10 NTRODUCTION 5.2..........................12 ESTING THE PHASE OVERCURRENT RELAY 5.2.1.

  • Page 4: Introduction To This Technical Guide

    SVERKER 900 is designed to manage this task and this Technical Guide describes how two self-powered relays can be tested.
  • Page 5 Technical Guide Testing self-powered relays with SVERKER 900 Figure 1. The test terminals provided by WIC-1 relay (from the WIC-1 user’s manual [5], Copyright SEG GmbH) and by the ABB REJ603 (from the REJ603 user’s manual [6], Copyright ABB) The currents are injected through the test points easily accessible from the relay. The current flows through the special multi-winding main CTs, and it is induced back to the analog inputs of the relay.

  • Page 6: Pre-Fault Quantities

    In SVERKER 900 this means that the “pre-fault and fault” instrument shall be used, where the pre-fault currents are set at a certain current level for a reasonable time which is long enough to let the protection relay be “ready”...

  • Page 7: General Information About Overcurrent Relays

    SVERKER 900 with indication “Current generator MkII” is designed to test self-powered relays. It is important to be aware that the technology behind self-powered relays is in continuous and fast development (see par. 2), so it cannot be promised that all self-powered relays are managed. Please contact Megger if you need support.

  • Page 8: The "Time Multiplier", Tms

    Technical Guide Testing self-powered relays with SVERKER 900 Figure 4. The 6 standardized IEC curves in IEC 60255-151:2009. From IEC 60255-151:2009 ed.1.0 - “Copyright © 201x IEC Geneva, Switzerland. www.iec.ch” 4.1.2. The “Time Multiplier”, TMS. Many names have always been given to the so-called time multiplier, known as “k factor”, “alpha factor”, “a factor”...
  • Page 9 Technical Guide Testing self-powered relays with SVERKER 900 When the operate time shown in the characteristic is tested, the inverse curve (or definite time curve) is tested. This means to verify the “operate time” of the overcurrent relay in different fault (current) conditions.

  • Page 10: Testing Wic-1 Overcurrent Relay With Sverker 900

    Technical Guide Testing self-powered relays with SVERKER 900 5. Testing WIC-1 overcurrent relay with SVERKER 900. 5.1. Introduction The WIC-1 relay is connected to the protected feeder via a special multi winding CT. The one winding of the CT is the test winding. The test secondary current is injected from dedicated test terminals (see par.
  • Page 11 Technical Guide Testing self-powered relays with SVERKER 900 Figure 7. Meaning of the dipswitches (table from the WIC-1 user’s manual pages 20, 21 and 22 [5] , Copyright SEG GmbH), their position in the tested relay and list of different The Normal Inverse characteristic for WIC-1 relay is the standardized curve “A”...

  • Page 12: Testing The Phase Overcurrent Relay

    Technical Guide Testing self-powered relays with SVERKER 900 5.2. Testing the phase overcurrent relay. 5.2.1. Relay settings. The phase overcurrent protection relay has the following settings in primary values I>= 30 A Characteristic Normal Inverse (IEC “A”: Inverse, par. 4.1.1) Time Multiplier (a) = 0,3 I>>= 200 A...

  • Page 13: Connecting Sverker 900 To Wic-1 Relay

    I>> = 10 x Is  I>> = 10 x 0,4 A = 4 A (secondary test currents) 5.2.2. Connecting SVERKER 900 to WIC-1 relay. SVERKER 900 is connected to the protection relay according to Figure 11, where the three phase currents and the operate (trip) contact are shown. Page 13(33)

  • Page 14: Sverker 900 Settings

    Figure 12. Settings for Binary Input 1 of SVERKER 900 connected to the trip signal from WIC-1, 8 Note that only binary input 1 in SVERKER 900 has the flexibility to adjust both debounce filter and voltage threshold! Page 14(33)

  • Page 15: Testing The Overcurrent Protection Function

    [13]. Figure 29 shows an extract of the SVERKER 900 user’s manual where the functionality of MTT in pre-fault and fault instrument is described. Figure 13. Short description of the functionality of MTT in pre-fault and fault instrument (from the SVERKER 900 user’s manual [13], Copyright Megger).
  • Page 16 Technical Guide Testing self-powered relays with SVERKER 900 Figure 14. Pre-fault of 0,25 A for 1 second in MTT pre-fault and fault. Set then the “first fault” values (Figure 15): Figure 15. “First fault” of 0,8 A (timeout after 10 seconds) in MTT pre-fault and fault.
  • Page 17 I>> threshold was measured at roughly 3,9 A of injection. This represents a 10% error on current measurement and is reasonable (see par. 5.2.5) considering the analog circuitry between the SVERKER 900 and the analog inputs of the protection relay (S1-S2 terminals). See details in par. 5.2.5.
  • Page 18 The current shown is the “TEST CURRENT” (1A test current = 50 A primary current) To save the file, and eventually view the report in the PC application SVERKER VIEWER, please follow the instructions given in SVERKER 900 manual [13]. Page 18(33)

  • Page 19: Can We Accept The Test Results

    5.2.5. Can we accept the test results? SVERKER 900 is a relay test equipment that lets the engineer decide if the test result is Ok or not. From the graph shown in Figure 22, the result is doubtful: a noticeable large deviation from the “theoretical curve”...

  • Page 20: Testing The Protection Function Without Pre-Fault (Switch Onto Fault)

    Technical Guide Testing self-powered relays with SVERKER 900 Figure 24. Graphical verification for the time curve for measurement errors 10% lower than the injected ones. These measured points are below the curve “ABOVE”. As conclusion, the test results can be accepted, as the measured points are reasonably between the high and low curves.
  • Page 21 Technical Guide Testing self-powered relays with SVERKER 900 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).
  • Page 22 Technical Guide Testing self-powered relays with SVERKER 900 Table below summarizes the test results: Test Nr. WIC-1 Operate Time WIC-1 Operate Time pre-fault 250 mA / 1 s NO pre-fault (switch onto fault) Fault 7 A Fault 7 A 202 ms...

  • Page 23: Testing Wip-1 Overcurrent Relay With Sverker 900

    Technical Guide Testing self-powered relays with SVERKER 900 6. Testing WIP-1 overcurrent relay with SVERKER 900. 6.1. Introduction The WIP-1 relay is tested from direct secondary injection, as it would be done from any “conventional” relay connected to main CTs.

  • Page 24: Connecting Sverker 900 To Wip-1 Relay

    Repeate point 2 and 3 above to change the other parameters. 6.2.2. Connecting SVERKER 900 to WIP-1 relay. SVERKER 900 is connected to the protection relay according to Figure 28, where the three phase currents and the operate (trip) contact are shown.

  • Page 25: Sverker 900 Settings

    [13]. Figure 29 shows an extract of the SVERKER 900 user’s manual where the functionality of MTT in pre-fault and fault instrument is described. 13 Note that not all SVERKER 900 are equipped with this functionality, please contact Megger for details.

  • Page 26: Testing The Overcurrent Protection Function

    . Each pre-fault and fault sequence is started by pressing 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. Figure 30, Figure 31 and Figure 32 show the most important points.
  • Page 27 To stop the sequence of tests, tap At this point follow the instructions in the SVERKER 900 manual to view the data, insert the time characteristic curves, save the file and view the report with SVERKER VIEWER.

  • Page 28: Testing The Tripping Circuits Of Wip-1 (Self-Test)

    HMI. Before preparing the relay for this test, prepare the SVERKER 900 connections and the test sequence. For this test, the Sequencer instrument will be used in SVERKER 900.

  • Page 29: Testing The Protection Function Without Pre-Fault (Switch Onto Fault)

    A simple video clip [14] shows the self-testing procedure in WIP-1 relay activated when this sequence is run. In the video clip, the injection is done without current generators in parallel, but it is anyhow suggested to perform this with the parallel connection in SVERKER 900. 6.4. Testing the protection function without pre-fault (switch onto fault).
  • Page 30 Technical Guide Testing self-powered relays with SVERKER 900 the “switch onto fault” situation, but it may happen when the circuit breaker is closed on an energized but unloaded feeder. This test aims to compare the operate time of the relay in two conditions: Pre-fault of 500 mA present for 1 second, fault current of 8 A (above I>>...

  • Page 31: Acknowledgment

    Technical Guide Testing self-powered relays with SVERKER 900 Figure 38.MTT Pre-fault and fault sequence for simulation of no presence of load before the fault (switch onto fault) and test results. Table below summarizes the test results: Test Nr. WIP-1 Operate Time...

  • Page 32: About The Authors

    Klaus is training manager and application expert at Megger GmbH, Germany 8.3. Lennart Schottenius Lennart is senior technical support specialist for relay test equipment and tools at Megger Sweden AB 8.4. Stefan Larsson Stefan is product manager for relay test equipment and tools at Megger Sweden AB 9.

  • Page 33: References

    [12] J. D. Media, ‘Substation test system now gives you even more versatility’, Engineering Update, Nov. 06, 2019. https://engineering-update.co.uk/2019/11/06/substation-test-system-now-gives-you-even-more-versatility/ (accessed Sep. 22, 2020). [13] Megger Sweden AB, ‘(PDF) SVERKER 900 Relay and substation test system User guide’, ResearchGate, 2020 2013. https://www.researchgate.net/publication/344339510_SVERKER_900_Relay_and_substation_test_system_Us er_guide (accessed Sep.

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