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Caution!
Also for tests on the local circuit breaker of the feeder a trip command to the surrounding circuit breakers can
be issued for the busbar.
Non-observance of the following measure can result in minor personal injury or property damage.
Therefore, primarily it is recommended to interrupt the tripping commands to the adjacent (busbar) breakers,
e.g. by interrupting the corresponding pickup voltage supply.
Before the breaker is closed again for normal operation the trip command of the feeder protection routed to the
circuit breaker must be disconnected so that the trip command can only be initiated by the breaker failure pro-
tection.
Although the following list does not claim to be complete, it may also contain points which are to be ignored in
the current application.
Auxiliary Contacts of the CB
The circuit breaker auxiliary contact(s) form an essential part of the breaker failure protection system in case
they have been connected to the device. Make sure the correct assignment has been checked.
External Initiation Conditions
If the breaker failure protection can also be started by external protection devices, the external start conditions
are checked. Depending on the device version and the setting of the breaker failure protection, single-pole or
three-pole trip are possible. The pole discrepancy check of the device or the actual breaker may lead to three-
pole tripping after single-pole tripping. Therefore check first how the parameters of the breaker failure protection
are set. See also Section 2.6.2, addresses 3901 onwards.
In order for the breaker failure protection to be started, a current must flow at least through the monitored phase
and the earth. This may be a secondary injected current.
After every start the indication „BF Start" (no. 1461) must appear in the spontaneous or fault indications.
If only single-pole initiation is possible:
• Start by single-pole trip command of the external protection L1:
Binary input functions „>BF Start L1" and, if necessary, „>BF release" (in spontaneous or fault indi-
cations). Trip command (depending on settings).
• Start by single-pole trip command of the external protection L2:
Binary input functions „>BF Start L2" and, if necessary, „>BF release" (in spontaneous or fault indi-
cations). Trip command (depending on settings).
• Start by single-pole trip command of the external protection L3:
Binary input functions „>BF Start L3" and, if necessary, „>BF release" (in spontaneous or fault indi-
cations). Trip command (dependent on settings).
• Start by three-pole trip command of the external protection via all three binary inputs L1, L2 and L3:
Binary input functions „>BF Start L1", „>BF Start L2" and „>BF Start L3" and, if necessary,
„>BF release" (in spontaneous or fault indications). Three-pole trip command.
For three-pole initiation:
• Start by three-pole trip command of the external protection :
Binary input functions „>BF Start 3pole" and, if necessary, „>BF release" (in spontaneous or fault
indications). Trip command (dependent on settings).
Switch off test current.
SIPROTEC, 7VK61, Manual
C53000-G1176-C159-3, Release date 05.2009
Mounting and Commissioning
3.3 Commissioning
219
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