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11.5
Primary and Secondary Tests of the Circuit-Breaker Failure
Protection
Integration of the Protection Function into the Station
The integration of the protection function into the station must be tested in the real-life application. Because
of the multitude of possible applications and possible system configurations, the required tests cannot be
described here in detail.
NOTE
i
i
Always keep the local conditions, the station plans, and protection plans in mind.
NOTE
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Siemens recommends isolating the circuit breaker of the tested feeder at both ends before starting the
tests. Line disconnector switches and busbar disconnector switches must be open so that the circuit
breaker can be operated without risk.
General Precautions
!
CAUTION
Tests on the local circuit breaker of the feeder cause a trip command to the output to the adjacent (busbar)
circuit breakers.
Noncompliance with the following measure can result in minor personal injury or physical damage.
In a first step, interrupt the trip commands to the adjacent (busbar) circuit breakers, for example, by
²
disconnection of the corresponding control voltages.
For testing the circuit-breaker failure protection, it must be ensured that the protection (external protection
device or device-internal protection functions) cannot operate the circuit breaker. The corresponding trip
command must be interrupted.
Although the following list does not claim to be complete, it can also contain points, which have to be ignored
in the current application.
Test Modes
The device and the function can be switched to test mode. These test modes support the test of the function
in different ways:
Test Modes
Device in test mode
CBFP function in test mode (device is NOT in test
mode)
SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
11.5 Primary and Secondary Tests of the Circuit-Breaker Failure Protection
Explanation
This operating mode is relevant for the following tests:
1. Approach of current thresholds in the case of an
external start: Supervision of the binary input signals in
the case of an external start is disabled. This setting allows
a static activation of the starting signals in order to
approach the current threshold.
2. Check whether the issued trip commands actuate the
corresponding circuit breakers, because the device
contacts are also actuated in the device test mode.
This operating mode is important for function tests in
which the generated operate indications are NOT
supposed to actuate the binary outputs.
Functional Tests
1379
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