3.3 Commissioning
305
7SD610 Manual
C53000-G1176-C145-4
Figure 3-23 Example of viewing the transmission times and availability of the protection data
interface
3.3.6 Checking for Breaker Failure Protection
General If the device is equipped with the breaker failure protection and this function is used,
the integration of this protection function into the system must be tested under practi-
cal conditions.
Because of the manifold applications and various configuration possibilities of the
plant it is not possible to give a detailed description of the necessary test steps. It is
important to consider the local conditions and the protection and plant drawings.
Before starting the circuit tests it is recommended to isolate the circuit breaker of the
feeder to be tested at both ends, i.e. line disconnectors and busbar disconnectors
should be open so that the breaker can be operated without risk.
Caution!
Also for tests on the local circuit breaker of the feeder a trip command to the surround-
ing circuit breakers can be issued for the busbar.
Non-observance of the following measure can result in minor personal injury or prop-
erty damage.
Therefore, primarily it is recommended to interrupt the tripping commands to the ad-
jacent (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 protection.
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 pro-
tection system in case they have been connected to the device. Make sure the correct
assignment has been checked.
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