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Functional Tests
9.7 Primary and Secondary Tests of the Circuit‑Breaker Failure Protection
9.7
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 for the individual application.
Because of the multitude of possible applications and possible system configurations, the required tests
cannot be described here in detail.
NOTE
i
i
If circuit‑breaker fail is provided precautions must be taken to ensure that this system is not triggered
during testing of the protection device.
!
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 supply voltages.
Incorrect installation or configuration of circuit‑breaker fail protection can cause significant system distur-
bance and therefore may warrant special attention. 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 are not applicable
for all applications.
Circuit‑Breaker Auxiliary Contacts
Correct configuration, connection and operation of circuit‑breaker auxiliary contacts is essential for the correct
operation of circuit‑breaker failure functionality.
•
Make sure that the correct assignment has been checked and operation tested.
Internal CB Fail Starting Conditions (Trip Command from Internal Protection Function)
The internal start can be tested by means of tripping a protection function, for example, the main protection
function of the device.
•
Check the settings for circuit‑breaker failure initiation by protection elements.
•
For the circuit‑breaker failure protection to be able to pick up, a phase current (see current-flow criterion)
must be present. This can be generated by secondary test current injection.
•
Generate the trip for the protection function. This can be generated within the device by a test sequence
(see description in the Operating manual) or by creating corresponding secondary test values.
•
The trip command(s) and their time delay compared to the pickup, depending on the parameterization.
Completion of Testing
•
All temporary measures taken for testing must be undone, such as special switch positions, interrupted
trip commands, changes to setting values, or individually switched off protection functions.
462
Reyrolle 7SR5, Overcurrent Protection Device, Device Manual
C53000-G7040-C014-1, Edition 11.2019
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