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[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
0
X
1
1
=
⋅
=
V
X
I
'
p
x
θ
sin
+
1
where,
−
k
100
=
+
+
xs
I
'
I
I
x
0
100
X
is the Z1G setting reach.
1
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
6.5.1.4
Phase Selection Element UVC
The testing circuit is shown in Figure 6.5.1.7.
UVC elements and their output signal numbers are listed below.
Measuring element
UVC-A
UVC-B
UVC-C
The following shows the case when testing UVC-A.
• Press 5 (=Logic circuit) on the Test screen to display the Logic circuit screen.
• Enter 608 as a signal number to be observed at monitoring jack A and press the ENTER
key.
• Apply a three-phase rated voltage.
•
Set the test current IT to zero ampere and adjust the voltage. Measure the voltage at which
the element operates. Check that the voltage is within ± 5% of the setting UVCV. (The
(X
, R
)
1
1
θ
1
θ
2
θ
tan
+
1
1
θ
tan
1
2
⋅
⋅
I
'
θ
x
θ
sin
I
'
tan
⋅
1
x
θ
tan
I
'
r
−
k
k
=
+
xm
rs
I
I
'
I
,
0
m
r
100
100
Signal number
608
609
610
258
θ
: Z1Gθ1 setting angle
1
θ
: Z1Gθ2 setting angle
2
R
100
k
+
rm
I
I
0
0
m
100
6 F 2 S 0 8 5 0
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