Toshiba GRZ100 B Series, Instruction Manual

Page: 234 / 447

⎯
233
⎯
6 F 2 S 0 8 4 6
ZFG
ZR1G
ZR2G
ZNDG
PSBGIN
PSBGOU
T
[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
: Z1G
θ
1 setting angle
θ
2
: Z1G
θ
2 setting angle
θ
θ
θ
θ
θ
θ
sin
1
'
'
'
tan
tan
1
tan
tan
1
sin
1
'
1
2
1
1
⋅ ⋅
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
⋅ +
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
+
= ⋅ =
x
r
x
x p
I
I
I
X
I X V
where,
m
xm xs
x
I
k
I
k
I I
0 0
100 100
100
'
+
−
+ =
,
m
rm rs
r
I
k
I
k
I I
0 0
100 100
100
'
+
−
+ =
X
1
is the Z1G 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 Z1G θ 2 setting and either the load blinder or mho
settings, as appropriate
6.5.1.2 Out-of-step Element OST
The testing circuit is shown in Figure 6.5.1.1.
The output signal numbers of the OST-ZM and OST-ZN elements are as follows:
Measuring element Signal number
OST-ZM 84
OST-ZN 85
The followings are the cases for OST-ZM. (The test procedure for OSTR1 and OSTR2 must be