249
6
F
2
S
0
8
3
4
Element reach setting (ZS)
IT
2IT
×
ZS
Measured voltage (2V
a
)
Z4S
ZFS
ZR1S
ZR2S
ZNDS
PSBSIN
PSBSOUT
[Testing of Zone 1 bending characteristic]
The test circuit and test method is same as above.
The operating voltage of Zone 1 bending characteristic can be calculated as follows:
X
R
(X
1
, R
1
)
θ
1
θ
2
0
θ
1
: Z1S
θ
1 setting angle
θ
2
: Z1S
θ
2 setting angle
θ
θ
θ
θ
θ
θ
sin
1
tan
tan
1
tan
tan
1
sin
1
1
2
1
1
⋅
⋅
+
+
=
⋅
=
I
X
I
X
V
p
where,
X
1
is the Z1S setting reach.
θ
is the angle difference between voltage and current.
Note: Toshiba recommend that a minimum of three values for
θ
be tested to check that the
correct relay settings have been applied.
Care must be taken in choosing values of
θ
to ensure that the testing points come
within the operating boundary defined by the Z1S
θ
2 setting and either the load
blinder or mho settings, as appropriate.
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. ElectricalPartManuals
. com
Summary of Contents for GRZ100-211B
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