specific protection IED. Only the setting values adopted shall be checked for each protection
function. If the discrepancy between obtained value and requested set value is too big the
setting should be adjusted, the new value recorded and a note should be made in the test
record.
10.2.2.4
Alarm test
SEMOD56528-20 v5
When inserting the test handle the alarm and event signalling is normally blocked. This is done
in the IED by setting the event reporting to
Off during the test. This can be done when the test
handle is inserted or the IED is set to test mode from the local HMI. At the end of the
secondary injection test it should be checked that the event and alarm signalling is correct by
activating the events and performing some selected tests.
10.2.2.5
Self supervision check
SEMOD56528-23 v6
Once secondary testing has been completed, it should be checked that no self-supervision
signals are activated continuously or sporadically. Especially check the time synchronization
system and communication signals.
10.2.2.6
Trip circuit check
SEMOD56528-26 v5
When the protection IED undergoes an operational check, a tripping pulse is normally obtained
on one or more of the output contacts and preferably on the test switch. The healthy circuit is
of utmost importance for the protection operation. If the circuit is not provided with a
continuous trip-circuit supervision, it is possible to check that circuit is really closed when the
test-plug handle has been removed by using a high-ohmic voltmeter and measuring between
the plus and the trip output on the panel. The measurement is then done through the trip coil
of the circuit breaker and therefore the complete trip circuit is checked.
Note that the breaker must be closed.
Please observe that the test system does not provide built-in security during
this test. If the instrument should be set on Amp instead of Volts, the circuit
breaker naturally is tripped, therefore, great care is necessary.
Trip circuit from trip IEDs to circuit breaker is often supervised by trip-circuit supervision. It
can then be checked that a circuit is healthy by opening tripping output terminals in the
cubicle. When the terminal is opened, an alarm shall be achieved on the signal system after a
delay of some seconds.
Remember to close the circuit directly after the test and tighten the terminal
carefully.
10.2.2.7
Measurement of service currents
SEMOD56528-30 v4
After a maintenance test it is recommended to measure the service currents and service
voltages recorded by the protection IED. The service values are checked on the local HMI or in
PCM600. Ensure that the correct values and angles between voltages and currents are
1MRK 505 385-UEN C
Section 10
Commissioning and maintenance of the fault clearing system
Breaker protection REQ650
103
Commissioning manual
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