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7SG18 Solkor N Commissioning
7SG18 Solkor N
Numeric Differential Protection
Document Release History
This document is issue
2010/02.
The list of revisions up to and including this issue is:
Pre release
2010/02
Document reformat due to rebrand
Software Revision History
The copyright and other intellectual property rights in this document, and in any model or article produced from it
(and including any registered or unregistered design rights) are the property of Siemens Protection Devices
Limited. No part of this document shall be reproduced or modified or stored in another form, in any data retrieval
system, without the permission of Siemens Protection Devices Limited, nor shall any model or article be
reproduced from this document unless Siemens Protection Devices Limited consent.
While the information and guidance given in this document is believed to be correct, no liability shall be accepted
for any loss or damage caused by any error or omission, whether such error or omission is the result of
negligence or any other cause. Any and all such liability is disclaimed.
©2010 Siemens Protection Devices Limited
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Table of Contents
Related Manuals for Siemens 7SG18 Solkor N
Summary of Contents for Siemens 7SG18 Solkor N
- Page 1 Limited. No part of this document shall be reproduced or modified or stored in another form, in any data retrieval system, without the permission of Siemens Protection Devices Limited, nor shall any model or article be reproduced from this document unless Siemens Protection Devices Limited consent.
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Page 2: Table Of Contents
7SG18 Solkor N Commissioning Contents Required Test Equipment..........................3 Inspection ............................... 3 Applying Settings............................3 Precautions ..............................3 Insulation Tests .............................. 3 Injection Tests ..............................4 Secondary Injection Tests........................4 6.1.1 Current Differential ........................4 6.1.2 IDMTL/DTLOver Current and Earth Fault Pick-up and Reset ............. 5 6.1.3... -
Page 3: Required Test Equipment
7SG18 Solkor N Commissioning 1 Required Test Equipment • 500V Insulation resistance test set. • Variable single or three phase secondary injection current source rated at greater than 10A. The amplitude must be adjustable. • Time interval meter. • Primary injection equipment up to circuit rating. -
Page 4: Injection Tests
7SG18 Solkor N Commissioning Connect together all of the C.T. terminals and measure the insulation resistance between these terminals and all of the other relay terminals connected together and to earth. Connect together the terminals of the DC auxiliary supply circuit and measure the insulation resistance between these terminals and all of the other relay terminals connected together and to earth. -
Page 5: Idmtl/Dtlover Current And Earth Fault Pick-Up And Reset
7SG18 Solkor N Commissioning The stability of the differential protection system can only be checked when primary load current is applied, refer to item 6.3 below. Loop Test Mode A single relay can be tested on its own in this mode. To select this mode, press the [Down] arrow button on the relay until the PROTECTION SIGNALLING MENU appears, and select the Signal Test Mode to LOOP TEST using [ENTER] and [UP]/[DOWN] arrow keys. -
Page 6: Overcurrent And Earth Fault Idmtl/Dtl Timing Characteristics
7SG18 Solkor N Commissioning Check that all pick-up current levels are measured within 105% ± 4% of the applied setting. Check that the reset levels are ≥95% of the measured pick-up value. Note: Depending upon the applied settings a trip could occur if the current is on for longer than the relay operating time. -
Page 7: Status Inputs
7SG18 Solkor N Commissioning The CBF feature works by looking at the reset of the protection element(s) that have operated, allocated fault triggers to distinguish between alarm and trip outputs and an optional level detector on each of the relay poles. -
Page 8: Output Relays
7SG18 Solkor N Commissioning 6.1.7 Output Relays All relay models have seven output relays, three of which have change-over contacts; the remaining four have normally open contacts. Each contact can be tested individually by the trip test feature or they can be checked during commissioning by testing the feature to which they are assigned. -
Page 9: Chapter 7 Page 9 Of 17
7SG18 Solkor N Commissioning With the relays connected normally and load current flowing the relay should be stable and minimum differential current displayed on the instruments. Reversing the CT connections will cause the relays to become unstable and they will issue a trip signal. High levels of differential current can be observed on the instruments. -
Page 10: Trip And Intertrip Tests
7SG18 Solkor N Commissioning Waveform storage can be triggered either by the trip initiation (i.e. Test No 1) or by energising a status input which has been programmed to trigger a waveform record (i.e. Test No 2). These records can be used as part of the protection commissioning report for the relay under test. -
Page 11: Sample Test Records
7SG18 Solkor N Commissioning 9 Sample Test Records RECORD OF COMMISSIONING TESTS RESULTS Substation Name: Feeder Name: Date Tested: INSULATION TEST RESULTS M Ohms Between Relay a.c. current inputs and earth Between Relay power supply terminals and earth Between Relay status inputs and earth... -
Page 12: Chapter 7 Page 12 Of 17
7SG18 Solkor N Commissioning Phase C Table 3 - Timing Characteristic Results Current Input Lowset Setting Measured Pick-up Error (±5% setting) Phase A Phase B Phase C Table 4 - Lowset Setting Results Current Input Highset 1 Setting Measured Pick-up Error (±5% of setting) -
Page 13: Chapter 7 Page 13 Of 17
7SG18 Solkor N Commissioning CBF Level PU Setting PU Measured Error Detectors (±5% of setting) Phase A Phase B Phase C Table 12 – External Circuit Breaker fault Timing Results Status Inputs S/I No Tested OK ( ) Table 13 – Status Input Test Results... -
Page 14: Chapter 7 Page 14 Of 17
7SG18 Solkor N Commissioning On Load Tests Substation A - Substation B - Instruments Display Phase Measured Restraint Current Restraint current Differential Differential Load displayed by relay displayed by relay at Current Current Current at Substation A Substation B Displayed S/S... -
Page 15: Chapter 7 Page 15 Of 17
7SG18 Solkor N Commissioning Test 2 – Phase Comparison trip Blocked – low feeder load current P/F Differential Setting (Sec Amps) Restraint Current (Sec Amps) CT Reversal – OFF No trip – Yes/No *CT Reversal – ON Relay Trip –... -
Page 16: Chapter 7 Page 16 Of 17
7SG18 Solkor N Commissioning 240V A.C. Supply Time Interval Meter START DC Aux Supply STOP Figure 1 - Secondary Injection Test Circuit SOLKOR N DC Aux Supply Primary Injection Test Source Figure 2 - Phase to Earth Primary Injection Test Circuit ©2010 Siemens Protection Devices Limited... - Page 17 7SG18 Solkor N Commissioning SOLKOR N DC Aux Supply Primary Injection Test Source Figure 3 - Phase to Phase Primary Injection Test Circuit ©2010 Siemens Protection Devices Limited Chapter 7 Page 17 of 17...
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