7SR18 Commissioning & Maintenance Guide
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Contents
Section 1: Common Functions ............................................................................................................................ 6
1.1 Overview ........................................................................................................................................... 6
1.2 Before Testing ................................................................................................................................... 6
1.2.1 Safety .................................................................................................................................. 6
1.2.2 Sequence of Tests ............................................................................................................... 6
1.2.3 Test Equipment .................................................................................................................... 7
1.2.4 Use of PC to facilitate testing ................................................................................................ 7
1.2.5 Precautions .......................................................................................................................... 7
1.2.6 Applying Settings ................................................................................................................. 7
1.2.7 Tests ................................................................................................................................... 8
1.2.8 Inspection ............................................................................................................................ 8
1.2.9 Secondary Injection Tests..................................................................................................... 8
1.2.10 Primary Injection Tests ......................................................................................................... 8
1.2.11 Putting into Service .............................................................................................................. 8
1.2.12 AC Analogue Energising Quantities ...................................................................................... 9
1.2.13 Binary Inputs ........................................................................................................................ 9
1.2.14 Binary Outputs ................................................................................................................... 10
1.2.15 Relay Case Shorting Contacts ............................................................................................ 10
Section 2: Protection Functions ........................................................................................................................ 11
2.1 Biased Differential (87BD, 87HS) ..................................................................................................... 12
2.2 Secondary Injection Testing ............................................................................................................. 13
2.3 Current Differential........................................................................................................................... 13
2.4 Typical results for testing 87BD ........................................................................................................ 15
2.5 Differential Highset 87HS ................................................................................................................. 15
2.6 Primary Injection Tests..................................................................................................................... 16
2.7 End to end Signalling ....................................................................................................................... 18
2.8 On-Load Tests ................................................................................................................................. 18
Section 3: Putting Into Service .......................................................................................................................... 20
3.1 Phase Overcurrent (50, 51) .............................................................................................................. 21
3.2 Definite Time Overcurrent (50) ......................................................................................................... 22
3.3 Inverse Time Overcurrent (51)......................................................................................................... 22
3.3.1 Element Blocking ............................................................................................................... 23
3.3.2 ANSI Reset ........................................................................................................................ 23
3.3.3 IEC Reset .......................................................................................................................... 24
3.4 Cold Load (51C) .............................................................................................................................. 25
3.4.1 Inverse Time Overcurrent (51C) ......................................................................................... 27
3.4.2 ANSI Reset ........................................................................................................................ 27
3.4.3 IEC Reset .......................................................................................................................... 28
3.4.4 Element Blocking ............................................................................................................... 28
3.5 Derived Earth Fault (50N, 51N) ........................................................................................................ 29
3.5.1 Definite Time Overcurrent (50N) ......................................................................................... 30
3.5.2 Inverse Time Overcurrent (51N) .......................................................................................... 30
3.5.3 Element Blocking ............................................................................................................... 31
3.5.4 ANSI Reset ........................................................................................................................ 32
3.5.5 IEC Reset .......................................................................................................................... 32
3.6 Measured Earth fault (50G,51G) ...................................................................................................... 33
3.6.1 Definite Time Overcurrent (50G) ......................................................................................... 34
3.6.2 Inverse Time Overcurrent (51G) ......................................................................................... 34
3.6.3 Element Blocking ............................................................................................................... 35
3.6.4 ANSI Reset ........................................................................................................................ 36
3.6.5 IEC Reset .......................................................................................................................... 36
3.7 Negative Phase Sequence Overcurrent (46NPS) .............................................................................. 37
3.7.1 Definite Time NPS Overcurrent (46DT) ............................................................................... 38
3.7.2 Inverse Time NPS Overcurrent 46IT) .................................................................................. 38
3.7.3 ANSI Reset ........................................................................................................................ 39
3.7.4 Element Blocking ............................................................................................................... 39
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