3 Operation
(continued)
3-140 C232-302-401/402/403/404-603 / C232/EN M/A23
Bay interlock for operation
with station interlock
For the station interlock equations to be interrogated, there needs to be communication
with substation control level. If the C232 detects a communication error or if there is no
communication interface, there will be an automatic switch to bay interlock without
station interlock.
If there is to be a check on the bay and station interlock, the bay interlock will be
checked first. If bay interlocking issues a switching enable, a switching request will be
sent to substation control level. At substation control level, there will then be a check as
to whether - taking into account the station interlock equations - it is permissible to
switch. If substation control level also issues an enabling command, the switching
operation is carried out provided that the enable from the bay interlock is still present.
Optionally, the ‘Open’ or ‘Close’ switching operation can be carried out without checking
the station interlock equations. In this case, the bay interlock equations defined for
operation without station interlock equations will be consulted.
3-108 Enabling of the switching commands by the station interlock
Linking the protection
commands to the switching
commands
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