TOC-4 345 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
Neutral timed overcurrent (51N)................................................................................... 6 - 71
Neutral instantaneous overcurrent (50N)................................................................. 6 - 74
Negative sequence timed overcurrent (51_2)........................................................ 6 - 76
Negative sequence instantaneous overcurrent (50_2)...................................... 6 - 79
S4 Controls.........................................................................................................................6 - 81
Change setpoint group ..................................................................................................... 6 - 81
Virtual inputs .......................................................................................................................... 6 - 82
Logic elements ...................................................................................................................... 6 - 83
Winding breaker failure .................................................................................................... 6 - 92
Lockout (86)............................................................................................................................. 6 - 94
S5 Inputs/Outputs ..........................................................................................................6 - 96
Contact inputs ....................................................................................................................... 6 - 96
Output relays ......................................................................................................................... 6 - 97
Output Relay 1 - W1 breaker "Trip" ............................................................................6 - 98
Output Relay 2 - W2 breaker "Trip" ............................................................................6 - 98
Auxiliary Output Relays 3 to 6......................................................................................6 - 100
Virtual inputs .......................................................................................................................... 6 - 101
Remote inputs ....................................................................................................................... 6 - 102
Remote outputs .................................................................................................................... 6 - 102
S6 Monitoring....................................................................................................................6 - 103
Demand.................................................................................................................................... 6 - 103
Current demand..................................................................................................................6 - 104
RTD temperature monitoring (49T) .............................................................................. 6 - 105
7. MAINTENANCE M1 Relay information ...................................................................................................7 - 2
M3 Breaker maintenance ...........................................................................................7 - 4
Trip coil...................................................................................................................................... 7 - 4
Breaker trip counter............................................................................................................7 - 8
Breaker health....................................................................................................................... 7 - 10
Reset counters ...................................................................................................................... 7 - 13
M4 Breaker monitor.......................................................................................................7 - 14
M5 Relay maintenance................................................................................................7 - 15
Ambient temperature ........................................................................................................ 7 - 15
M7 Testing..........................................................................................................................7 - 17
Force LEDs............................................................................................................................... 7 - 17
Force output relays.............................................................................................................7 - 18
General maintenance...................................................................................................7 - 19
In-service maintenance.................................................................................................... 7 - 19
Out-of-service maintenance .......................................................................................... 7 - 19
Unscheduled maintenance (system interruption)................................................ 7 - 19
A. APPENDIX Warranty ............................................................................................................................A - 1
Repairs.................................................................................................................................A - 2
Change Notes...................................................................................................................A - 3
Manual Revision history.................................................................................................... A - 3
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