ABB Relion 650 Series Technical Manual page 157

1MRK 511 424-UEN B
Bay control REC650 2.2 IEC
Technical manual
Bay 1
Disc QB1 and QB2 closed
WA1 not earthed
WA2 not earthed
WA1 and WA2 interconn
WA1
WA2
QB1
QB2
QA1
QB9
IEC05000494 V1 EN-US
Figure 63: 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
Station bus
Bay n
Disc QB1 and QB2 closed
. . .
WA1 not earthed
WA2 not earthed
WA1 and WA2 interconn
. .
QB1
QB2
QA1
QB9
Section 8
Control
Bus coupler
WA1 unearthed
WA1 unearthed
WA1 and WA2 interconn
WA1 and WA2 interconn
in other bay
QB2
QC1
QB1
QA1
en05000494.vsd
QC2
151