Toshiba GRZ100-211B, Instruction Manual

Page: 136 / 463

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135
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6 F 2 S 0 8 3 4
Figure 2.7.2.4 Matching of Busbar Voltage and Line Voltage
Autoreclosing requirement
Using PLC function, various reclose requirements can be designed. In Figure 2.7.2.1, a reclose
requirement for "SPAR", "TPAR" or "SPAR&TPAR" can be respectively assigned to the
following signals by PLC:
"SPAR": [SPR.L-REQ]
"TPAR": [TPR.L-REQ]
"SPAR&TPAR": [SPR.L-REQ], [TPR.L-REQ]
The default setting is as follows:
Reclose requirement Default setting Remarks
"SPAR" [SPR.L-REQ] = CONSTANT_1 No condition
"TPAR" [TPR.L-REQ] = SYP-ON Voltage and synchronism check
Permanent fault
When reclose-onto-a-fault is activated when a permanent fault exists, three-phase final tripping is
performed. However, this operation is performed only in the single-shot autoreclose mode. In the
multi-shot autoreclose mode, reclosing is retried as described below.
Multi-shot autoreclose
In multi-shot autoreclose, low-speed autoreclose is executed up to three times after high-speed
autoreclose fails. The first shot is high-speed autoreclose that functions in the same manner as
described for single-shot autoreclose. Figure 2.7.2.5 shows the simplified scheme logic for the
low-speed autoreclose of the second to fourth shot.
The multi-shot mode, two to four shots, is set with the scheme switch [ARC-SM].
Distance
Measuring
Busbar or line
voltages
Line or busbar
reference voltage
[VTPH - SEL]
"C"
"B"
"A"
+
+
+
Vref
Vc
Vb
Va
[VT - RATE]
"PH/G"
[3PH - VT]
"Line"
"Bus"
"PH/PH"
+
+
+
+
Voltage check
&
Synchronism check
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