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Interlocking
Bay 1
Disc Q
and Q
closed
A
B
A not earthed
B not earthed
A and B interconnected
A
B
Q
Q
A
B
Q
0
Q
L
)LJXUH 'DWD H[FKDQJH EHWZHHQ LQWHUORFNLQJ PRGXOHV
The interlocking function in a bay that uses invalid data as conditions does not give a
release for command. Invalid data of positions of HV apparatuses can be obtained, for
example, at intermediate positions, loss of a control terminal, or at input board error.
On the station HMI an override function exists, which can be used to bypass the inter-
locking function if not all available data for the condition are valid.
For all interlocking modules these general rules apply:
•
•
•
Station bus
Bay n
Disc Q
and Q
A
A not earthed
B not earthed
A and B interconnected
Q
A
The interlocking conditions for opening or closing of disconnectors and earthing
switches are always identical.
Earthing switches at line feeder end, e.g. rapid earthing switches, are normally in-
terlocked only with reference to the conditions in the bay where they are located,
not with reference to switches on the other side of the line. So a line voltage indica-
tion may be included into line interlocking modules. If there is no line voltage su-
pervision within the bay, then the appropriate inputs must be set to QR YROWDJH, and
the operator must consider this when operating.
Earthing switches can only be operated at isolated sections e.g. without load/volt-
age. Circuit breaker contacts cannot be used for isolating of a section, i.e. the status
of the circuit breaker is irrelevant for earthing switch operation.
Bus coupler
closed
B
A and B interconn in other bay
Q
Q
B
A
Q
Q
0
0
Q
L
&KDSWHU
&RQWURO
A not earthed
B not earthed
A and B interconnected
Q
Q
Q
B
AE
BE
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