Disc QB1 and QB2 closed
WA1 not earthed
WA2 not earthed
WA1 and WA2 interconn
Disc QB1 and QB2 closed
WA1 not earthed
WA2 not earthed
WA1 and WA2 interconn
. . .
. .
Station bus
QB1
WA1
WA2
Bay 1
Bay n
Bus coupler
WA1 unearthed
WA1 unearthed
WA1 and WA2 interconn
WA1 and WA2 interconn
in other bay
QB2
QA1
QB9
QB1
QB2
QA1
QB9
QB2
QB1
QA1
QC1
QC2
en05000494.vsd
IEC05000494 V1 EN
Figure 306:
Data exchange between interlocking modules
When invalid data such as intermediate position, loss of a control IED, or input board
error are used as conditions for the interlocking condition in a bay, a release for
execution of the function will not be given.
On the local HMI an override function exists, which can be used to bypass the
interlocking function in cases where not all the data required for the condition is 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 on the line feeder end, for example, rapid earthing switches, are
normally interlocked 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 indication may be included into line interlocking modules. If there is no
line voltage supervision within the bay, then the appropriate inputs must be set to
no voltage
, and the operator must consider this when operating.
•
Earthing switches can only be operated on isolated sections for example, without
load/voltage. Circuit breaker contacts cannot be used to isolate a section, that is,
the status of the circuit breaker is irrelevant as far as the earthing switch operation
is concerned.
•
Disconnectors cannot break power current or connect different voltage systems.
Disconnectors in series with a circuit breaker can only be operated if the circuit
breaker is open, or if the disconnectors operate in parallel with other closed
connections. Other disconnectors can be operated if one side is completely
isolated, or if the disconnectors operate in parallel to other closed connections, or
if they are earthed on both sides.
•
Circuit breaker closing is only interlocked against running disconnectors in its
bay or additionally in a transformer bay against the disconnectors and earthing
Section 14
1MRK502052-UEN B
Control
646
Technical manual
Содержание Relion REG670
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