Auto-Recloser Blocking Logic; Auto-Recloser Settings - NR Electric PCS-9611 Instruction Manual

Where:
"U " is the protection voltage value;
Prot
"U " is the synchro-check voltage value;
Sy n
[25.U_Dd] the voltage setting for denoting whether the system is dead;
[25.U_Lv] the voltage setting for denoting whether the system is live;
"t " is the setting [25A.t_DdChk], the time setting of the dead check function for the
ARDdChk
auto-recloser;
[25A.Opt_DdChk] is the setting for selecting the dead check mode of the auto-recloser.

Non-check mode
In non-check mode case, the reclosing is permitted without taking the value , phase angle and
frequency of the two voltages into account. After the reclosing delay time, this relay will issue
a reclosing signal, if all the other reclosing conditions are ready.
If the two settings [79.En_SynChk] and [79.En_DdChk] are set as "0", the non-check mode will be
in service. If one of the two settings [79.En_SynChk] and [79.En_DdChk] is set as "1", the relevant
reclosing check mode will be in service. If the two settings [79.En_SynChk] and [79.En_DdChk]
are set as "1" together, the two reclosing check modes will be in service; and if anyone of the
reclosing check modes is met, the corresponding check output is for the auto-reclosing.

3.17.5 Auto-recloser Blocking Logic

After the auto-recloser is put into service successfully, and if anyone of the following cases occurs
at anytime in normal operation situation, the relay will block the auto-recloser automatically at
once.
1. Open the circuit breaker by manual tripping.
2. Open the circuit breaker by remote tripping.
3. The VT failure occurs and it is detected by the relay ([VTS.Alm_SynVT] = 1 or [VTS.Alm] = 1),
if the reclosing check mode is dead check mode.
The blocking signal of the auto-recloser "79.Blk" is "1"; that is at least one of the blocking
4.
auto-recloser conditions is met. The blocking auto-recloser conditions can be configured for
blocking the auto-recloser through the PCS-Explorer configuration tool auxiliary software
The binary input of the closing operation circuit status of the CB (BI_LowPres_Cls) is "1"; i.e.
5.
the CB is not ready for reclosing ([BI_LowPres_Cls] = 1).
6. The last auto-reclosing command has been issued successfully.
If the auto-recloser is blocked, there is an empty battery sign on the right bottom of LCD.

3.17.6 Auto-recloser Settings

All the settings of the auto-recloser are listed in the following table. For the information about the
PCS-9611 Feeder Relay
Date: 2014-04-08
3 Operation Theory
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