7SR45 Description of Operation
© 2017 Siemens Protection Devices Limited Chapter 1 Page 2 of 34
Contents
Section 1: Introduction ....................................................................................................................................... 6
1.1 Current Transformer Circuits .............................................................................................................. 6
1.2 External Resistors.............................................................................................................................. 6
1.3 Description ........................................................................................................................................ 6
1.4 Ordering Options ............................................................................................................................... 7
1.5 Functional Diagram ............................................................................................................................ 8
1.6 Terminal Diagram .............................................................................................................................. 9
Section 2: Hardware Description ...................................................................................................................... 10
2.1 Operator Interface............................................................................................................................ 10
2.1.1 Liquid Crystal Display (LCD) ............................................................................................... 11
2.1.2 Keypad .............................................................................................................................. 12
2.1.3 Light Emitting Diode (LED) ................................................................................................. 13
2.2 Home Screen .................................................................................................................................. 13
2.3 Password Protection ........................................................................................................................ 13
2.4 Software Version Menu .................................................................................................................... 14
2.5 Alert Screen .................................................................................................................................... 14
2.5.1 Fault Alert .......................................................................................................................... 14
2.5.2 Alarm Alert ......................................................................................................................... 14
2.5.3 Info Alert ............................................................................................................................ 14
2.6 Parameter Edit Screen ..................................................................................................................... 15
Section 3: Protection Functions (50, 51, 50N, 51N, 50G, 51G, 50LC) ................................................................ 16
3.1 Instantaneous Overcurrent Protection (50)........................................................................................ 16
3.2 Time Delayed Overcurrent Protection (51) ........................................................................................ 17
3.3 Instantaneous Derived Earth Fault Protection (50N) .......................................................................... 18
3.4 Time Delayed Derived Earth Fault Protection (51N) .......................................................................... 19
3.5 Instantaneous Measured Earth Fault Protection (50G) ...................................................................... 20
3.6 Time Delayed Measured Earth Fault Protection (51G) ...................................................................... 21
3.7 Switch-On-To-Fault (50LC/SOTF) .................................................................................................... 22
3.8 General Alarm ................................................................................................................................. 24
3.9 Reset LEDs Outputs ........................................................................................................................ 24
3.9.1 Binary Input........................................................................................................................ 24
3.9.2 Reydisp Software ............................................................................................................... 25
3.9.3 TEST/RESETâ–º Key........................................................................................................... 25
3.10 Current Inputs.................................................................................................................................. 26
3.11 Binary Inputs ................................................................................................................................... 26
3.12 Binary Outputs ................................................................................................................................. 27
3.12.1 Binary Output Matrix ........................................................................................................... 27
3.12.2 Self Reset/Hand Reset ....................................................................................................... 27
3.12.3 Binary Output Configuration ................................................................................................ 27
3.13 Binary Output Operation .................................................................................................................. 29
3.13.1 BO Trip/Reset on Battery Power and USB Power ................................................................ 29
3.13.2 BO Trip/Reset on CT Power ............................................................................................... 29
3.14 Impulse output ................................................................................................................................. 29
3.15 Modes of Operation ......................................................................................................................... 29
3.15.1 CT Power........................................................................................................................... 29
3.15.2 USB Power ........................................................................................................................ 31
3.15.3 Battery Power .................................................................................................................... 31
3.15.4 Sleep Mode........................................................................................................................ 31
3.15.5 Low Battery Indication ........................................................................................................ 31
3.16 Maintenance Mode .......................................................................................................................... 32
3.16.1 Output Test ........................................................................................................................ 32
3.17 Self Monitoring ................................................................................................................................ 32
3.17.1 Internal Relay Failure (IRF) ................................................................................................. 32
3.18 Data Storage ................................................................................................................................... 33
3.18.1 Fault Records (Trip Log) ..................................................................................................... 33
3.18.2 Event Records (Event Log) ................................................................................................. 33
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