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3.1 Overview
The PCS-9611 relay is a microprocessor based relay which can provide matur e protection for
various primary equipments (such as overhead line, underground cable and transformer etc.).
The following sections detail the individual protection functions of this relay.
NOTE! In each functional element, the signal input [XXXX.En1] is used for inputting the
enabling signals; and the signal input [XXXX.Blk] is used for inputting the blocking
signals. The "XXXX" is the name code of the functional element (such as "50/51P1", "49",
"50/51G2" etc.). They can be configured through PCS-Explorer configuration tool
auxiliary software. If the signal input [XXXX.En1] is not used, its default value is "1"; and
if the signal input [XXXX.Blk] is not used, its default value is "0".
3.2 Fault Detectors
The fault detector will operate if any of the following conditions is satisfied.
1.
The startup conditions of the auto-recloser are satisfied if the auto-recloser is enabled and
ready for operating.
2.
Any one of the phase currents is in excess of the setting of the stage 1 overcurrent protection
multiplied by 0.95 if the stage 1 overcurrent protection is enabled.
3.
Any one of the phase currents is in excess of the setting of the stage 2 overcurrent protection
multiplied by 0.95 if the stage 2 overcurrent protection is enabled.
4.
Any one of the phase currents is in excess of the setting of the stage 3 overcurrent protection
multiplied by 0.95 if the stage 3 overcurrent protection is enabled.
5.
Any one of the phase currents is in excess of the setting of the stage 4 overcurrent protection
multiplied by 0.95 if the stage 4 overcurrent protection is enabled.
6.
The No.1 zero sequence current is in excess of the setting of the stage 1 of the No.1 zero
sequence overcurrent protection multiplied by 0.95 if the stage 1 of the No.1 zero sequence
overcurrent protection is enabled.
7.
The No.1 zero sequence current is in excess of the setting of the stage 2 of the No.1 zero
sequence overcurrent protection multiplied by 0.95 if the stage 2 of the No.1 zero sequence
overcurrent protection is enabled.
8.
The No.1 zero sequence current is in excess of the setting of the stage 3 of the No.1 zero
sequence overcurrent protection multiplied by 0.95 if the stage 3 of the No.1 zero sequence
overcurrent protection is enabled.
9.
The No.1 zero sequence current is in excess of the setting of the stage 4 of the No.1 zero
sequence overcurrent protection multiplied by 0.95 if the stage 4 of the No.1 zero sequence
overcurrent protection is enabled.
PCS-9611 Feeder Relay
Date: 2014-04-08
3 Operation Theory
3-1
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