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3 Operation Theory
1.
The CB is closed manually (local or remote) and the CB normally closed contact (BI_52b) is
"0".
2.
Any protection element is not in startup status; i.e. the fault detector does not operate: when
the CB is closed, if the fault detector is operated, it means that the CB is closed onto an
abnormal system or a fault system.
The blocking signal of the auto-recloser "79.Blk" is "0"; that is no blocking auto-recloser
3.
condition is met.
The binary input of the operation circuit status of the CB (BI_LowPres_Cls) is "0"; i.e. the CB
4.
is ready for reclosing.
If the auto-recloser is ready, there is a full charged battery sign on the right bottom of LCD.
The logic diagram of the auto-recloser ready conditions is shown as below.
[BI_52b]
[FD.Pkp]
[BI_LowPres_Cls]
[79.Blk]
[79.En]
[79.En1]
Figure 3.17-4 Logic diagram of the auto-recloser ready conditions
Where:
[79.En] is the logic setting of the auto-recloser;
[79.En1] is the binary signal for enabling the auto-recloser;
[BI_52b] is the binary input for inputting the normally closed contact of the circuit breaker;
[FD.Pkp] means that the fault detector is operated;
[BI_LowPres_Cls] is the binary input for inputting the CB closing low pressure signal;
[79.Blk] is the binary signal for blocking the auto-recloser;
"t
" is the setting [79.t_CBClsd] of the minimum time delay for ensuring the CB is closed;
CBCls
"t
" is the setting [79.t_CBReady] of the time delay for ensuring the CB is ready;
CBRdy
"t
" is the setting [79.t_DDO_BlkAR] of the pulse width for ensuring the AR blocking
PWBlk
signal.
3.17.3 Auto-recloser Startup Condition
The startup condition of the auto-recloser is that anyone of the protective elements (for example,
the overcurrent protection, zero sequence overcurrent protection etc.) which are configured for
initiating the auto-recloser through the PCS-Explorer configuration tool auxiliary software has
3-58
t
100ms
CBCls
&
t
0
CBRdy
0
t
PWBlk
&
Date: 2014-04-08
&
79.Ready
PCS-9611 Feeder Relay
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