ABB Relion 650 Series REL650 Commissioning Manual page 154

Section 7
Commissioning and maintenance of the fault clearing system
146
Disabled 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.
Self supervision check
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, GPS or other, and communication signals, both station
communication and remote communication.
Trip circuit check
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 tripping magnet of the circuit breaker and
therefore the complete tripping 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.
Measurement of service currents
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
1MRK 506 331-UUS A
Commissioning Manual