Toshiba GRZ100-211B, Инструкция по эксплуатации, Страница: 62 / 463

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2.4.4.1 Directional Earth Fault Command Protection
High-speed directional earth fault command protection is provided using the forward looking
directional earth fault element DEFF and reverse looking directional earth fault element DEFR.
The signaling channel of DEF command protection can be shared with or separated from distance
protection by the scheme switch [CH-DEF].
The DEF command protections are applied in combination with the distance command protection
POP, UOP, BOP and PUP and enabled when the scheme switch [SCHEME] is set to "POP+DEF",
"UOP+DEF", "BOP+DEF" or "PUP+DEF". These protections are called as the DEF POP, DEF
UOP, DEF BOP and DEF PUP hereafter. The POP, UOP or BOP schemes can be selected as a
common scheme. However, in the DEF PUP, distance protection takes the PUP scheme but DEF
command protection takes the POP scheme and signaling channels of distance and DEF command
protections are always separated (CH1: distance, CH2: DEF, see Section 2.4.3.9.).
The DEF command protection can select fast tripping or delayed tripping by a timer setting.
Delayed tripping is used when it is desired to give priority to distance protection.
The DEF command protection is blocked during a single-phase autoreclose period by the distance
protection (CB-DISCR=1). The signal CB-DISCR is generated with the binary input signals (PLC
signals) of circuit breaker auxiliary contact (refer to Section 3.2.1).
"POP+DEF"
"UOP+DEF"
"BOP+DEF"
"PUP+DEF"
DEFFCR
DEFR
DEFF
NON VTF
&
CB-DISCR
TDEFF
t 0
[SCHEME]
&
TDEFR
t 0
0 – 300ms
DEFRCR
216
215
Figure 2.4.4.2 DEF Command Protection
DEF POP, DEF UOP and DEF PUP scheme logic
Figure 2.4.4.3 shows the scheme logic of the DEF POP and DEF UOP.
When the PUP+DEF scheme logic is selected, the DEF scheme logic is constructed same as the
DEF POP scheme logic in Figure 2.4.4.3.
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