Toshiba GRZ100-211B, Инструкция по эксплуатации

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6 F 2 S 0 8 3 4
Element Setting Remarks
BRLS
θ
Interlinked with BFLS
θ Angle of reverse left blinder BRLS
Z4G
θ
(*2) Interlinked with Z3G
θ Characteristic angle of Z4 mho element
Z4BG
θ
(*3) Interlinked with ZBG
θ Angle of Z4 directional element
BRRG
θ Fixed to 75° Angle of reverse right blinder BRRG
BRLG Interlinked with BRRG Reverse blinder
BRLG
θ
Interlinked with BFLG
θ
Angle of reverse left blinder BRLG
(*1) Ohmic values shown in the parentheses are in the case of 1 A rating. Other ohmic values are in the
case of 5 A rating.
(*2) Valid only when mho-based characteristic is selected by ZS-C.
(*3) Valid only when quadrilateral characteristic is selected by ZS-C.
The reverse looking elements Z4 (G,S), BRR (G,S) and BRL (G,S) must always operate for
reverse faults for which the forward overreaching element of the remote end operates. The
following setting coordination is required.
When zone 2 is selected as the forward-looking element,
Z4 setting = 1.2
×
(Zone 3 setting at remote end)
or
Z4 setting =
α ×
(Zone 2 setting at remote end)
Note:
α
should be determined in consideration of the extension of zone 2 by zero-sequence
compensation.
When zone 3 is selected,
Z4 setting = 1.2
×
(Zone 3 setting at remote end)
In both cases,
BRR setting = 1.2
×
(BFR setting at remote end)
The delayed pick-up timer TCHD is set as follows taking into account the transmission delay time
of the blocking signal and a safety margin of 5 ms.
TCHD setting = maximum signal transmission delay time(*) + 5ms
(*) includes delay time of binary output and binary input for the blocking signal when the external
communication is used.
2.4.3.5 Protection for Weak Infeed Terminal
The POP and UOP are provided with an echo function and weak infeed trip function. Both
functions are used for lines with weak infeed terminals.
Figure 2.4.3.5 shows the scheme logic for the echo function.
With the POP, when a trip permission signal is received (R1-CR=1, R2-CR=1) if neither forward
overreaching zone 2 or zone 3 nor reverse looking Z4 have operated, the echo function sends back
the received signal to the remote terminal. With the UOP, when reception of a blocking signal is
stopped (R1-CR=0, R2-CR=0) if neither forward overreaching zone 2 (or zone 3) nor reverse
looking Z4 have operated, the echo function stops sending the blocking signal to the remote
terminal. When the circuit breaker is open (CB-OR = 1), too, the echo function sends back the trip
permission signal or stops sending the blocking signal. Timer TECCB is used to set the time from
CB opened to the echo logic enabled.
The terminal on which the forward overreaching element has operated can be tripped at high speed
by this echoed signal.
Once the forward overreaching element or reverse looking element have operated, transmission of
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