7SR210 & 7SR220 Commissioning & Maintenance Guide
© 2013 Siemens Protection Devices Limited Page 3 of 82
Contents
Document Release History ............................................................................................................... 2
Software Revision History ................................................................................................................ 2
Contents ............................................................................................................................................ 3
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 Precautions.............................................................................................................. 7
1.2.5 Applying Settings ..................................................................................................... 7
1.3 Tests .................................................................................................................................... 9
1.3.1 Inspection ................................................................................................................ 9
1.3.2 Secondary Injection Tests ........................................................................................ 9
1.3.3 Primary Injection Tests............................................................................................. 9
1.3.4 Putting into Service .................................................................................................. 9
1.4 AC Energising Quantities ................................................................................................... 10
1.5 Binary Inputs ...................................................................................................................... 11
1.6 Binary Outputs ................................................................................................................... 12
1.7 Relay Case Shorting Contacts ............................................................................................ 13
Section 2: Protection Functions ..................................................................................................... 14
2.1 Phase Directional Polarity Check ........................................................................................ 15
2.1.1 2 out of 3 logic ....................................................................................................... 16
2.2 Phase Overcurrent (67/50,67/51) ....................................................................................... 17
2.2.1 Definite Time Overcurrent. (50) .............................................................................. 18
2.2.2 Inverse Time Overcurrent. (51) .............................................................................. 18
2.3 Voltage Controlled Overcurrent (51V) ................................................................................. 20
2.4 Cold Load (51c).................................................................................................................. 22
2.4.1 Inverse Time Overcurrent. (51C) ............................................................................ 23
2.1 Arc Flash Detection (50AFD) .............................................................................................. 25
2.2 Directional Earth Fault Polarity Check (67N) ....................................................................... 26
2.3 Derived Earth Fault (67/50N, 67/51N) ................................................................................. 27
2.3.1 Directional Polarity ................................................................................................. 28
2.3.2 Definite Time Overcurrent..(50N)............................................................................ 28
2.3.3 Inverse Time Overcurrent. (51N) ............................................................................ 28
2.4 Measured Earth fault (67/50G,67/51G) ............................................................................... 31
2.4.1 Directional Polarity ................................................................................................. 32
2.4.2 Definite Time Overcurrent..(67/50G)....................................................................... 32
2.4.3 Inverse Time Overcurrent. (67/51G) ....................................................................... 32
2.5 Sensitive Earth fault (67/50S,67/51S) ................................................................................. 35
2.5.1 Directional Polarity ................................................................................................. 36
2.5.2 Definite Time Overcurrent. (50SEF) ....................................................................... 36
2.5.3 Inverse Time Overcurrent. (51SEF) ........................................................................ 36
2.6 Restricted Earth fault. (64H) ............................................................................................... 39
2.7 Negative Phase Sequence Overcurrent (46NPS)................................................................ 41
2.7.1 Definite Time NPS Overcurrent. (46DT) ................................................................. 42
2.7.2 Inverse Time NPS Overcurrent. (46IT) ................................................................... 42
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