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
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
1.2.13
Binary Inputs ........................................................................................................................ 9
1.2.14
Binary Outputs ................................................................................................................... 10
1.2.15
Section 2: Protection Functions ........................................................................................................................ 11
2.3 Current Differential........................................................................................................................... 13
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
3.2 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
3.4.2
ANSI Reset ........................................................................................................................ 27
3.4.3
IEC Reset .......................................................................................................................... 28
3.4.4
Element Blocking ............................................................................................................... 28
3.5.1
3.5.2
3.5.3
Element Blocking ............................................................................................................... 31
3.5.4
ANSI Reset ........................................................................................................................ 32
3.5.5
IEC Reset .......................................................................................................................... 32
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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7SR18 Commissioning & Maintenance Guide
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