ABB REO 517, Applications Manual

Page: 249 / 440

239
Interlocking
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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:
• 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
QRYROWDJH
, 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.
Disc Q
A
and Q
B
closed
A not earthed
B not earthed
A and B interconnected
Bay 1
Disc Q
A
and Q
B
closed
A not earthed
B not earthed
A and B interconnected
Bay n
Bus coupler
A not earthed
B not earthed
A and B interconnected
A and B interconn in other bay
Q
B
Q
0
Q
L
A
B
Q
A
Q
B
Q
0
Q
L
Q
A
Q
B
Q
A
Q
0
Q
AE
Q
BE
Station bus
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