The second knee of the tripping characteristic is defined by the setting at
DIFF: Idiff> PSx.
The characteristic equations for the three different ranges are given below.
shows the tripping characteristic.
Characteristics equation for the range 0
≤
I
R
≤
0.5
I
diff
>
:
I
d
I
ref
=
I
diff
>
I
ref
Characteristics equation for the range 0.5
I
diff
>
<
I
R
≤
I
R
,
m
2
:
I
d
I
ref
=
m
1
⋅
I
R
I
ref
+
I
diff
>
I
ref
⋅
(
1
−
0.5
⋅
m
1
)
Characteristics equation for the range
I
R
,
m
2
<
I
R
:
I
d
I
ref
=
m
2
⋅
I
R
I
ref
+
I
diff
>
I
ref
⋅
(
1
−
0.5
⋅
m
1
)
+
I
R
,
m
2
I
ref
⋅
(
m
1
−
m
2
)
I
ref
: reference current
m
1
: gradient of the characteristic in range 0.5
I
diff
>
<
I
R
≤
I
R
,
m
2
m
2
: gradient of characteristic in range
I
R
,
m
2
<
I
R
2
4
6
8
0
2
4
6
8
I
III
II
64Z8017
Tripping area
m1 = 0.3
m2
=
0.7
= 0.2
Id>
Iref
IR
Iref
Id
Iref
IR,m2
Iref
= 4.0
Blocking area
Fa
ult cur
rent characteristic
for single-side
feed
Fig. 3-82: Tripping characteristic of differential protection
If the current transformer supervision (CTS) function is used, the basic pick-up
sensitivity DIFF: Idiff> PSx can be increased to a value set at
DIFF: Idiff>(CTS) PSx.
P631
3 Operation
3-116
P631/EN M/R-11-C // P631-310-650
Содержание P631
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Страница 276: ...6 8 Configurable Function Keys P631 6 Local Control HMI 6 10 P631 EN M R 11 C P631 310 650...
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