51
6
F
2
S
0
8
3
4
TERM 2TERM/3TERM
2TERM
Terminal
selection
Open1
OFF/ON
OFF
Remote terminal 1 out of service
Open2
OFF/ON
OFF
Remote terminal 2 out of service
ZONESEL
Z2/Z3
Z2
Overreaching element selection
PSB - CR
OFF/ON
ON
Power swing blocking
ECHO OFF/ON
ON Echo
function
WKIT
OFF/ON
ON
Weak infeed trip function
(*) 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.
The following elements have fixed setting values or their settings are interlinked with other
elements listed above. So no setting operation is required.
Element Setting
Remarks
Z4BS
Fixed to 1.5
Ω
Z4 reverse offset reach
(Fixed to 7.5
Ω
)(*1)
Z4S
θ
(*2)
Interlinked with Z3S
θ
Characteristic angle of zone 4 mho element
Z4BS
θ
(*3)
Interlinked with ZBS
θ
Angle of Z4 directional element
BRRS
θ
Fixed to 75°
Angle of reverse right blinder BRRS
BRLS
BRLS
θ
Interlinked with BRRS
Interlinked with BFLS
θ
Reverse left blinder
Angle of reverse right blinder BRRS
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 blinder BRRG
BRLG
Interlinked with BRRG
Reverse left 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 2 setting at remote end)
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)
2.4.3.4 Blocking Overreach Protection
Application
In blocking overreach protection (BOP), each terminal normally transmits a trip permission
signal, and transmits a trip block signal if the reverse looking Z4 operates and the forward
overreaching element does not operate. Tripping of the local circuit breaker is performed on
condition that the forward overreaching element has operated and a trip permission signal has
been received. As the forward overreaching element, it is possible to use zone 2 or zone 3.
In external communication, if signal modulation is performed by an ON/OFF method, the signal is
not normally transmitted and a trip block signal is transmitted only when the reverse looking
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Summary of Contents for GRZ100-211B
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