Siemens 7SR12 Argus - Table of Contents

7SR11 & 7SR12 Commissioning and Maintenance Guide
©2017 Siemens Protection Devices Limited Chapter 6 Page 3 of 72
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
1.3 Tests ....................................................................................................................................................... 8
1.3.1 Inspection.................................................................................................................................. 8
1.3.2 Secondary Injection Tests ......................................................................................................... 8
1.3.3 Primary Injection Tests ............................................................................................................. 8
1.3.4 Putting into Service ................................................................................................................... 8
1.4 AC Analogue Energising Quantities ........................................................................................................ 9
1.5 Binary Inputs ........................................................................................................................................... 9
1.6 Binary Outputs ...................................................................................................................................... 10
1.7 Relay Case Shorting Contacts .............................................................................................................. 10
Section 2: Protection Functions ............................................................................................................................. 11
2.1 Phase Directional Polarity Check .......................................................................................................... 12
2.1.1 2 out of 3 logic ......................................................................................................................... 13
2.2 Phase Overcurrent (67/50,67/51) .......................................................................................................... 14
2.2.1 Definite Time Overcurrent (50) ............................................................................................. 14
2.2.2 Inverse Time Overcurrent (51) .............................................................................................. 15
2.3 Voltage Controlled Overcurrent (51V) ................................................................................................... 17
2.4 Cold Load (51C) .................................................................................................................................... 19
2.4.1 Inverse Time Overcurrent (51C) ........................................................................................... 20
2.5 Arc Flash Detection (50AFD) ................................................................................................................ 23
2.6 Directional Earth Fault Polarity Check (67N) ......................................................................................... 24
2.7 Derived Earth Fault (67/50N, 67/51N) ................................................................................................... 25
2.7.1 Directional Polarity .................................................................................................................. 26
2.7.2 Definite Time Overcurrent (50N) .......................................................................................... 26
2.7.3 Inverse Time Overcurrent (51N) ........................................................................................... 26
2.8 Measured Earth fault (67/50G,67/51G) ................................................................................................. 29
2.8.1 Directional Polarity .................................................................................................................. 30
2.8.2 Definite Time Overcurrent (67/50G) ..................................................................................... 30
2.8.3 Inverse Time Overcurrent (67/51G) ...................................................................................... 30
2.9 Sensitive Earth fault (67/50S,67/51S) ................................................................................................... 33
2.9.1 Directional Polarity .................................................................................................................. 33
2.9.2 Definite Time Overcurrent (50SEF) ...................................................................................... 34
2.9.3 Wattmetric Protection .............................................................................................................. 34
2.9.4 Inverse Time Overcurrent (51SEF) ....................................................................................... 35
2.10 Restricted Earth fault (64H) ................................................................................................................. 37
2.11 Negative Phase Sequence Overcurrent (46NPS) ................................................................................. 39
2.11.1 Definite Time NPS Overcurrent (46DT) ............................................................................... 40
2.11.2 Inverse Time NPS Overcurrent (46IT) .................................................................................. 40
2.12 Undercurrent (37) ................................................................................................................................ 42
2.13 Thermal Overload (49) .......................................................................................................................... 44
2.14 Over/Under Voltage .............................................................................................................................. 46
2.14.1 Phase Under/Over Voltage (27/59) ........................................................................................ 46
2.14.2 Undervoltage Guard (27/59UVG) ............................................................................................ 48
2.14.3 NPS Overvoltage (47) ............................................................................................................. 48
2.14.4 Undervoltage Guard (47 U/V Guard) ...................................................................................... 49
2.14.5 Neutral Overvoltage (59N) ...................................................................................................... 50
2.14.6 Definite Time (59NDT) ............................................................................................................ 50
2.14.7 Inverse Time (59NIT) .............................................................................................................. 50
2.15 Under/Over Frequency (81) .................................................................................................................. 52
2.16 Power (32) ............................................................................................................................................ 54