139
6
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2
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0
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3
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The start of the dead time counter can be configured by the PLC. In the default setting, the
single-phase autoreclose is started instantaneously after tripping, and the three-phase autoreclose
is started after the ARC-SET condition is satisfied.
The “ARC-SET” is a scheme signal whose logical level becomes 1 when a lead breaker’s
autoreclose command is output.
In default setting, therefore, the dead time of the follower breaker is as follows:
•
Three-phase autoreclose: equal to the sum of the dead time setting of the two breakers.
(TTPR1 + TTPR2)
•
Single-phase autoreclose: TSPR2
However, the dead time can be set that of the leader breaker by the PLC setting “RF.ST-REQ”.
The shortening of the dead time can be also applied when the leader breaker is final-tripped
because it is no ready.
Autoreclose start requirement
Using PLC function, various autoreclose start requirements can be designed. In Figure 2.6.2.7, a
reclose start requirement for "SPAR", "TPAR" or "SPAR&TPAR" can be respectively assigned to
the following signals by PLC:
"SPAR":
[SPR.F-ST.REQ]
"TPAR":
[TPR.F-ST.REQ]
"SPAR&TPAR": [SPR.F-ST.REQ],
[TPR.F-ST.REQ]
The default setting for the follower CB autoreclose start requirement is as follows:
Reclose start
requirement
Default setting
Remarks
"SPAR"
[SPR.F-ST.REQ] = CONSTANT_1
No condition
"TPAR"
[TPR.F-ST.REQ] = ARC-SET
ARC-SET becomes “1” when the leader
CB is reclosed.
Autoreclose
requirement
The autoreclose requirement can be designed by assigning a reclose requirement to the signals
[SPR.F-ST.REQ] and [TPR.F-ST.REQ] same as above.
The default setting for the follower CB autoreclose requirement is as follows:
Reclose requirement
Default setting
Remarks
"SPAR"
[SPR.F-ST.REQ] = CONSTANT_1
No condition
"TPAR"
[TPR.F-ST.REQ] = SYP-ON
Voltage and synchronism check
Others
If the autoreclose start requirement is designed such as starting the follower CB in no-ready
condition of the leader CB, it is assigned to the signal [R.F-ST.REQ].
By assigning the autoreclose start requirement to the signal [R.F-ST.REQ], both the leader CB and
the follower CB are set the same dead time. The reclose requirement is assigned to the signals
[SPR.F2-ST.REQ] and [TPR.F2-ST.REQ].
The default setting for the follower CB is as follows:
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Summary of Contents for GRZ100-211B
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