7SR210 & 7SR220 Description of Operation
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Contents
Document Release History ................................................................................................................................. 2
Software Revision History .................................................................................................................................. 2
Contents ............................................................................................................................................................ 3
List of Figures .................................................................................................................................................... 5
Section 1: Introduction ....................................................................................................................................... 8
1.1 Current Transformer Circuits .............................................................................................................. 8
1.2 External Resistors.............................................................................................................................. 8
1.3 Fibre Optic Communication ................................................................................................................ 8
1.4 Front Cover ....................................................................................................................................... 8
1.5 Disposal ............................................................................................................................................ 8
Section 2: Hardware Description ...................................................................................................................... 15
2.1 General ........................................................................................................................................... 15
2.2 Case ............................................................................................................................................... 16
2.3 Front Cover ..................................................................................................................................... 16
2.4 Power Supply Unit (PSU) ................................................................................................................. 16
2.5 Operator Interface/ Fascia................................................................................................................ 16
2.6 Current Inputs.................................................................................................................................. 21
2.7 Voltage Inputs ................................................................................................................................. 21
2.8 Binary Inputs ................................................................................................................................... 21
2.9 Binary Outputs (Output Relays) ........................................................................................................ 22
2.10 Virtual Input/Outputs ........................................................................................................................ 23
2.11 Self Monitoring ................................................................................................................................ 23
2.11.1 Protection Healthy/Defective ............................................................................................... 24
Section 3: Protection Functions ........................................................................................................................ 25
3.1 Current Protection: Phase Overcurrent (67, 51, 50) ........................................................................... 25
3.1.1 Directional Control of Overcurrent Protection (67) – 7SR22 ................................................. 25
3.1.2 Instantaneous Overcurrent Protection (50) .......................................................................... 27
3.1.3 Time Delayed Overcurrent Protection (51) .......................................................................... 28
3.2 Current Protection: Voltage Controlled Overcurrent (51V) – 7SR22 ................................................... 30
3.3 Current Protection: Derived Earth Fault (67N, 51N, 50N)................................................................... 31
3.3.1 Directional Control of Derived Earth Fault Protection (67N) – 7SR22.................................... 31
3.3.2 Instantaneous Derived Earth Fault Protection (50N) ............................................................ 32
3.3.3 Time Delayed Derived Earth Fault Protection (51N) ............................................................. 33
3.4 Current Protection: Measured Earth Fault (67G, 51G, 50G)............................................................... 35
3.4.1 Directional Control of Measured Earth Fault Protection (67G) – 7SR22 ................................ 35
3.4.2 Instantaneous Measured Earth Fault Protection (50G) ......................................................... 36
3.4.3 Time Delayed Measured Earth Fault Protection (51G) ......................................................... 37
3.5 Current Protection: Sensitive Earth Fault (67SEF, 51SEF, 50SEF) .................................................... 38
3.5.1 Directional Control of Sensitive Earth Fault Protection (67SEF) – 7SR22 ............................. 38
3.5.2 Instantaneous Sensitive Earth Fault Protection (50SEF) ...................................................... 39
3.5.3 Time Delayed Sensitive Earth Fault Protection (51SEF) ...................................................... 41
3.6 Current Protection: High Impedance Restricted Earth Fault (64H) ..................................................... 43
3.7 Current Protection: Cold Load (51c) ................................................................................................. 44
3.8 Current Protection: Negative Phase Sequence Overcurrent (46NPS) ................................................ 45
3.9 Current Protection: Under-Current (37, 37G & 37SEF) ...................................................................... 46
3.10 Current Protection: Under-Current Guarded (37) ............................................................................... 46
3.11 Current Protection: Thermal Overload (49) ....................................................................................... 47
3.12 Current Protection: Arc Flash Detector (50 AFD) ............................................................................... 49
3.13 Voltage Protection: Phase Under/Over Voltage (27/59) - 7SR22 ....................................................... 50
3.14 Voltage Protection: Negative Phase Sequence Overvoltage (47) – 7SR22 ........................................ 51
3.15 Voltage Protection: Neutral Overvoltage (59N) – 7SR22 ................................................................... 52
3.16 Voltage Protection: Under/Over Frequency (81) – 7SR22.................................................................. 53
3.17 Power Protection: Power (32) – 7SR22 ............................................................................................ 54
3.18 Power Protection: Sensitive Power (32S) – 7SR22 ........................................................................... 55
3.19 Power Protection: Power Factor (55) – 7SR22 ................................................................................. 56
Section 4: Control & Logic Functions ................................................................................................................ 57
4.1 Auto-Reclose (79) ............................................................................................................................ 57
4.1.1 Overview............................................................................................................................ 57
4.1.2 Auto Reclose sequences .................................................................................................... 59
4.2 Autoreclose Prot’n Menu .................................................................................................................. 60
4.3 Autoreclose Config Menu ................................................................................................................. 60
4.4 P/F Shots Sub-Menu........................................................................................................................ 62
4.5 E/F Shots Sub-Menu........................................................................................................................ 62
4.6 SEF Shots Sub-Menu ...................................................................................................................... 62
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