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Contents
Section 1: Introduction ....................................................................................................................................... 7
Section 2: Hardware Description ...................................................................................................................... 11
2.1 General ........................................................................................................................................... 11
2.2 Case ............................................................................................................................................... 11
2.3 Front Cover ..................................................................................................................................... 12
2.4 Power Supply Unit (PSU) ................................................................................................................. 13
2.5 Operator Interface/ Fascia................................................................................................................ 14
2.6 Voltage Inputs ................................................................................................................................. 17
2.7 Binary Inputs ................................................................................................................................... 17
2.8 Binary Outputs (Output Relays) ........................................................................................................ 18
2.9 Virtual Input/Outputs ........................................................................................................................ 19
2.10 Self Monitoring ................................................................................................................................ 20
2.10.1
Protection Healthy/Defective ............................................................................................... 21
Section 3: Protection Functions ........................................................................................................................ 22
3.1 Voltage Protection: Phase Under/Over Voltage (27/59) ..................................................................... 22
3.2 Voltage Protection: Negative Phase Sequence Overvoltage (47) ....................................................... 23
3.3 Voltage Protection: Neutral Overvoltage (59N) .................................................................................. 24
3.4 Voltage Protection: Vector Shift (78) ................................................................................................. 25
3.5 Voltage Protection: Under/Over Frequency (81) ................................................................................ 26
3.6 Voltage Protection: Rate of Change of Frequency (81R) ................................................................... 27
Section 4: Control & Logic Functions ................................................................................................................ 28
4.1 Manual CB Control .......................................................................................................................... 28
4.2 Circuit Breaker ................................................................................................................................. 29
4.3 Quick Logic ..................................................................................................................................... 30
Section 5: Supervision Functions ...................................................................................................................... 32
5.1 VT Supervision ................................................................................................................................ 32
5.2 Trip/ Close Circuit Supervision (74TCS & 74CCS) ............................................................................ 32
Section 6: Other Features ................................................................................................................................ 33
6.1 Data Communications ...................................................................................................................... 33
6.2 Maintenance .................................................................................................................................... 33
6.2.1
Output Matrix Test .............................................................................................................. 33
6.2.2
CB Counters ...................................................................................................................... 33
6.3 Data Storage ................................................................................................................................... 34
6.3.1
General .............................................................................................................................. 34
6.3.2
Event Records ................................................................................................................... 34
6.3.3
Waveform Records. ............................................................................................................ 34
6.3.4
Fault Data Records ............................................................................................................ 35
6.3.5
Disk Activity Warning .......................................................................................................... 35
6.4 Instruments ..................................................................................................................................... 36
6.5 Operating Mode ............................................................................................................................... 36
6.6 Control Mode ................................................................................................................................... 37
6.7 Real Time Clock .............................................................................................................................. 37
6.7.1
Time Synchronisation – Data Communication Interface ....................................................... 37
6.7.2
Time Synchronisation – Binary Input ................................................................................... 37
6.8 Settings Groups ............................................................................................................................... 37
6.9 Password Feature............................................................................................................................ 38
©2014 Siemens Protection Devices Limited
Chapter 1) 7SR158 Description of Operation
Chapter 1) Page 3 of 38
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