Table Of Contents; Contents - Siemens 7SR21 Manual

Contents

Document Release History ...................................................................................................................................... 1
Software Revision History........................................................................................................................................ 1
Contents .................................................................................................................................................................. 2
List of Figures .......................................................................................................................................................... 4
List of Tables............................................................................................................................................................ 5
Section 1: Introduction ............................................................................................................................................. 6
1 Current Transformer Circuits................................................................................................................... 6
2 External Resistors ................................................................................................................................... 6
3 Fibre Optic Communication..................................................................................................................... 6
4 Front Cover ............................................................................................................................................. 6
Section 2: Hardware Description............................................................................................................................ 14
2.1 General ................................................................................................................................................. 14
2.2 Case...................................................................................................................................................... 14
2.3 Front Cover ........................................................................................................................................... 15
2.4 Power Supply Unit (PSU)...................................................................................................................... 15
2.5 Operator Interface/ Fascia .................................................................................................................... 15
2.6 Current Inputs ....................................................................................................................................... 18
2.7 Voltage Inputs ....................................................................................................................................... 18
2.8 Binary Inputs ......................................................................................................................................... 19
2.9 Binary Outputs (Output Relays) ............................................................................................................ 20
2.10 Virtual Input/Outputs ............................................................................................................................. 21
2.11 Self Monitoring ...................................................................................................................................... 21
2.11.1 Protection Healthy/Defective................................................................................................... 21
Section 3: Protection Functions ............................................................................................................................. 22
3.1 Current Protection: Phase Overcurrent (67, 51, 50).............................................................................. 22
3.1.1 Directional Control of Overcurrent Protection (67) - 7SR22 ................................................... 22
3.1.2 Instantaneous Overcurrent Protection (50) ............................................................................. 24
3.1.3 Time Delayed Overcurrent Protection (51).............................................................................. 25
3.2 Current Protection: Voltage Controlled Overcurrent (51V) - 7SR22 ..................................................... 27
3.3 Current Protection: Derived Earth Fault (67N, 51N, 50N) ..................................................................... 28
3.3.1 Directional Control of Derived Earth Fault Protection (67N) - 7SR22..................................... 28
3.3.2 Instantaneous Derived Earth Fault Protection (50N)............................................................... 29
3.3.3 Time Delayed Derived Earth Fault Protection (51N) ............................................................... 30
3.4 Current Protection: Measured Earth Fault (67G, 51G, 50G) ................................................................. 32
3.4.1 Directional Control of Measured Earth Fault Protection (67G) - 7SR22 ................................. 32
3.4.2 Instantaneous Measured Earth Fault Protection (50G)........................................................... 33
3.4.3 Time Delayed Measured Earth Fault Protection (51G) ........................................................... 34
3.5 Current Protection: Sensitive Earth Fault (67SEF, 51SEF, 50SEF)...................................................... 35
3.5.1 Directional Control of Sensitive Earth Fault Protection (67SEF) - 7SR22 .............................. 35
3.5.2 Instantaneous Sensitive Earth Fault Protection (50SEF) ........................................................ 36
3.6 Current Protection: High Impedance Restricted Earth Fault (64H) ....................................................... 38
3.7 Current Protection: Cold Load (51c) ..................................................................................................... 39
3.8 Current Protection: Negative Phase Sequence Overcurrent (46NPS) .................................................. 40
3.9 Current Protection: Under-Current (37, 37G & 37SEF)......................................................................... 41
3.10 Current Protection: Thermal Overload (49) ........................................................................................... 42
3.11 Voltage Protection: Phase Under/Over Voltage (27/59) - 7SR22.......................................................... 44
3.12 Voltage Protection: Negative Phase Sequence Overvoltage (47) - 7SR22 .......................................... 45
3.13 Voltage Protection: Neutral Overvoltage (59N) - 7SR22 ...................................................................... 46
3.14 Voltage Protection: Under/Over Frequency (81) - 7SR22 .................................................................... 47
Section 4: Control & Logic Functions ..................................................................................................................... 48
4.1 Auto-Reclose (79) ................................................................................................................................. 48
4.1.1 Overview ................................................................................................................................. 48
4.1.2 Auto Reclose sequences ........................................................................................................ 50
4.2 Autoreclose Prot'n Menu....................................................................................................................... 51
4.3 Autoreclose Config Menu...................................................................................................................... 51
4.4 P/F Shots Sub-Menu............................................................................................................................. 53
4.5 E/F Shots Sub-Menu............................................................................................................................. 53
4.6 SEF Shots Sub-Menu ........................................................................................................................... 53
4.7 Extern Shots Sub-Menu ........................................................................................................................ 54
4.8 Manual Control...................................................................................................................................... 56
4.9 Circuit Breaker ...................................................................................................................................... 56
4.10 Quick Logic ........................................................................................................................................... 58
Section 5: Supervision Functions........................................................................................................................... 60
5.1 Circuit Breaker Failure (50BF) .............................................................................................................. 60
©2010 Siemens Protection Devices Limited
7SR21 & 7SR22 Argus Description of Operation
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