Checking For Breaker Failure Protection - Siemens SIPROTEC 7SD610 Manual

Mounting and Commissioning
3.3 Commissioning
Figure 3-23
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 pro-
tection function into the system must be tested under practical 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 pro-
tection 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 surrounding circuit breakers can
be issued for the busbar.
Non-observance of the following measure can result in minor personal injury or property damage.
First disable the trip commands to the adjacent (busbar) breakers, e.g. by interrupting the associated control
voltages.
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.
308
Example of viewing the transmission times and availability of the protection data interface
SIPROTEC, 7SD610, Manual
C53000-G1176-C145-6, Release date 02.2011