3 Mounting and Commissioning
490
7SD5 Manual
C53000-G1176-C169-1
Figure 3-25 Example of viewing the transmission times and availability of the protection data interfaces
3.3.6 Tests for the Circuit 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 application facilities 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 breaker tests it is recommended to insulate at both ends the
feeder which is to be tested, 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 inrrupting 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.
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