37
6
F
2
S
0
8
3
4
Blinder setting
BFR and BRR reaches are set to the minimum load impedance with a margin. The minimum load
impedance is calculated using the minimum operating voltage and the maximum load current.
The blinder element (BFR) can be provided for each forward zone. The setting of blinder element
can be set independently or set common to forward zones by [BLZONE]=IND or
[BLZONE]=COM setting. In the [BLZONE]=IND setting, the forward zone blinder setting
should be set BFR1
∗≤
BFRX
∗≤
BFR2
∗≤
BFR
∗
. If BFR
∗≤
BFR1
∗
, for example, the reach of BFR1
∗
is limited to the BFR
∗
setting reach as shown in Figure 2.4.1.12(b). The BFRF
∗
can be set larger
than the BFR
∗
. If the BFRF
∗
is larger than the maximum resistive reach of Z3, the area exceeding
the Z3 is invalid. The BFRF
∗
is limited to Z3 operating zone as shown in Figure 2.4.1.12(C).
X
R
BFR
Z3
Z2
BFR1
Z1
BFR2
X
R
BFR1
Z3
Z2
BFR
BFR2
Z1
X
R
BFR
Z3
ZF
BFRF
(a) (b) (c)
Figure 2.4.1.12 BFR Reach
The BFL angle can be set to 90 to 135
°
and is set to 120
°
as a default. The BRL angle is linked with
the BFL angle.
Figure 2.4.1.12 shows an example of the blinder setting when the minimum load impedance is
ZLmin and Z’Lmin under the load transmitting and receiving conditions.
θ
θ
BFR
X
30
°
75
°
R
BFL
Load Area
ZLmin
75
°
Z’Lmin
BRL
BRR
Figure 2.4.1.13 Blinder Setting
When Z4 is used for overreaching command protection ie. POP, UOP and BOP, it is necessary
when setting BRR to take account of the setting of the remote end BFR to ensure coordination.
That is, the BRR is set to a value greater than the set value of the remote end BFR (e.g., 120% of
BFR). This ensures that a reverse fault that causes remote end zone 2 or zone 3 to operate is
detected in local zone R1 or R2 and false tripping is blocked.
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Summary of Contents for GRZ100-211B
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