6. Description of Operation of
Protection Subsystem
6.1 Overcurrent Elements ......................................................................................... 6-3
6.1.1 Time Elements .................................................................................................... 6-3
6.1.1.a Time/ Current Characteristics ............................................................................. 6-4
6.1.2 Instantaneous Elements ...................................................................................... 6-7
6.1.3 Overcurrent Units Block Diagrams ...................................................................... 6-7
6.1.4 Torque Control (Pickup Blocking Enable) ........................................................... 6-8
6.1.5 Trip Blocking and Time Delay Disable ................................................................ 6-9
6.2 Breaker Failure .................................................................................................... 6-9
6.3 Open Phase Element ........................................................................................ 6-10
6.4 Residual Current Element ................................................................................. 6-11
6.5 General Settings ............................................................................................... 6-12
6.6 Recloser (7IRD-A/J Models) ............................................................................. 6-13
6.6.1 Reclose Sequence ............................................................................................ 6-13
6.6.2 Recloser Lockout .............................................................................................. 6-17
6.6.3 Manual Close .................................................................................................... 6-17
6.6.4 Manual and External Blocking........................................................................... 6-18
6.6.5 Definite Trip ....................................................................................................... 6-19
6.6.6 Recloser Not in Service ..................................................................................... 6-19
6.6.7 Reclose Counter ............................................................................................... 6-19
6.6.8 Recloser and Trip Control Masks ...................................................................... 6-19
6.7 Logic .................................................................................................................. 6-21
6.7.1 Trip Seal-In ........................................................................................................ 6-21
6.7.2 Breaker Open and Breaker Close Failure Time ................................................ 6-21
6.7.3 Manual Closing through Recloser (7IRD-A/J Models) ...................................... 6-21
6.8 Trip and Close Coil Circuit Supervision ............................................................ 6-22
6.8.1 Trip Coil Circuit .................................................................................................. 6-23
6.8.2 Close Coil Circuit ............................................................................................... 6-23
6.8.3 Trip/Close Coil Circuit Supervision Input Programming .................................... 6-24
6.8.4 Trip/Close Output Supervision .......................................................................... 6-24
6.9 Breaker Monitoring ............................................................................................ 6-25
6.9.1 Excessive Number of Trips ............................................................................... 6-25
6.10 Change Settings Group ..................................................................................... 6-26
6.11 Event Record .................................................................................................... 6-27
6.12 Fault Reports ..................................................................................................... 6-32
6.13 Metering History Log ......................................................................................... 6-33
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