NR Electric PCS-9611, Instruction Manual

Page: 96 / 300

3 Operation Theory
PCS-9611 Feeder Relay
3-60
Date: 2014-04-08
“U
Sy n
” is the synchro-check voltage;
“ΔU” is the voltage difference of the protection voltage and the synchro-check voltage;
“Δf” is the frequency difference of the protection voltage and the synchro-check voltage;
“Δδ” is the angle difference of the protection voltage and the synchro-check voltage;
[25.U_Lv] is the voltage setting of the live voltage;
[25A.U_Diff] is the voltage difference setting of the synchronism check function for the
auto-recloser;
[25A.f_Diff] is the frequency difference setting of the synchronism check function for the
auto-recloser;
[25A.phi_Diff] is the phase angle difference setting of the synchronism check function for
the auto-recloser;
“t
ARSy nChk
” is the setting [25A.t_SynChk], the time setting of the synchronism check
function for the auto-recloser.

Dead check mode
In dead check mode case, the relay checks the protection voltage and synchro-check voltage.
There are several kinds of dead check modes which are supported in this relay and the dead
check mode can be selected according to the demands of a practical engineering by the
setting [25A.Opt_DdChk].
The relationship between the setting [25A.Opt_DdChk] and the dead check mode is listed in
following table.
[25A.Opt_DdChk] Description of Dead Check Mode
1 The protection voltage is dead, and the synchro-check voltage is dead.
2 The protection voltage is dead, and the synchro-check voltage is live.
3 The protection voltage is live, and the synchro-check voltage is dead.
4 The protection voltage is dead, the synchro-check voltage is live or dead.
5 The synchro-check voltage is dead, the protection voltage is live or dead.
6 One of the two voltages is live, another one is dead.
7 One of the two voltages is dead, another one is live or dead.
The logic diagram of the dead check element for the auto-recloser is shown as below.
25A.Ok_DdChk
Dead
Check
U
Prot
< [25.U_Dd]
U
Syn
< [25.U_Dd]/[25.U_Comp]
U
Prot
> [25.U_Dd]
U
Syn
> [25.U_Dd]/[25.U_Comp]
[25A.Opt_DdChk]
&
[VTS.Alm]
[VTS.Alm_SynVT]
t
ARDdChk
0
Figure 3.17-6 Logic diagram of the dead check element for AR