[endfehler-eineinhalb-ls-wlk-0702, 1, en_GB]
Figure 2-18
Stub fault at an 1
1
/
2
circuit breaker arrangement
If a short circuit current
Ι
A
and/or
Ι
B
flows while the line isolator 1 is open, this implies that a fault in the stub
range between the current transformers
Ι
A
,
Ι
B
and the line isolator exists. The circuit breakers CBA and CBC
that carry the short-circuit current can be tripped without delay. The two sets of current transformers are
connected in parallel such that the current sum
Ι
A
+
Ι
B
represents the current flowing towards the line isolator.
The stub protection is an overcurrent protection which is only in service when the state of the line isolator
indicates the open condition via a binary input
>I-STUB ENABLE
. The binary input must therefore be oper-
ated via an auxiliary contact of the isolator. In the case of a closed line isolator, the stub protection is out of
service. For more information see the next logic diagram.
If the stub protection stage is to be used as a normal definite time overcurrent stage, the binary input
>BLOCK
I-STUB
should be left without allocation or routing (matrix). However the release input
>I-STUB ENABLE
must be continually activated (either via a binary input or via the user definable logic functions CFC).
Functions
2.3 Overcurrent protection (optional)
72
SIPROTEC 4, 7VK61, Manual
C53000-G1176-C159-5, Edition 05.2018
Содержание SIPROTEC 4 7VK61
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