Blocking Instantaneous Protection For Lockouts; Figure 142: Blocking Instantaneous Protection For Selected Trips - GE MiCOM P40 Agile Technical Manual

Chapter 13 - Autoreclose
AR SeqCounter 0
Trip 1 Main
Block Inst Prot
No Block
AR SeqCounter 1
Trip 2 Main
Block Inst Prot
No Block
AR SeqCounter 2
Trip 3 Main
Block Inst Prot
No Block
AR SeqCounter 3
Trip 4 Main
Block Inst Prot
No Block
AR SeqCounter 4
SC Count > 4
Trip 5 Main
Block Inst Prot
No Block
AR SeqCounter 0
Trip 1 SEF
Block Inst Prot
No Block
AR SeqCounter 1
Trip 2 SEF
Block Inst Prot
No Block
AR SeqCounter 2
Trip 3 SEF
Block Inst Prot
No Block
AR SeqCounter 3
Trip 4 SEF
Block Inst Prot
No Block
AR SeqCounter 4
SC Count > 4
Trip 5 Main
Block Inst Prot
No Block
V00506

Figure 142: Blocking instantaneous protection for selected trips

7.4

BLOCKING INSTANTANEOUS PROTECTION FOR LOCKOUTS

Instantaneous protection can also be blocked for certain lockout conditions:
It is blocked when the CB maintenance lockout counter or excessive fault frequency lockout has reached its
penultimate value.
For example, if the setting No. CB Ops Lock in the CB MONITOR SETUP column is set to 100 and the No. CB Ops
Maint = '99', the instantaneous protection can be blocked to ensure that the last CB trip before lockout will be due
to discriminative protection operation. This is controlled using the EFF Maint Lock setting (Excessive Fault
Frequency maintenance lockout). If this is set to Block Inst Prot, the instantaneous protection will be
blocked for the last CB Trip before lockout occurs.
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& 1
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1
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&
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& 1
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1
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P14D
Block Main Prot Trips
Block SEF Prot Trips
P14D-TM-EN-8