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1MRK 506 377-UEN Rev. L
Section 11
11.1
Commissioning tests
During commissioning all protection functions shall be verified with the setting values used at each
plant. The commissioning tests must include verification of all circuits by green-lining the circuit
diagrams and the configuration diagrams for the used functions.
Further, the settings for protection functions are tested and recorded carefully as outlined for the
future periodic maintenance tests.
The final testing includes primary verification of all directional functions where load currents is
checked on the local HMI and in PCM600. The amplitudes and angles of all currents and voltages
should be checked and the symmetry verified.
Directional functions have information about the measured direction and, for example, measured
impedance. These values must be checked and verified as correct with the export or import of power
available.
Finally, final trip tests must be performed. This involves activation of protection functions or tripping
outputs with the circuit breaker closed and the tripping of the breaker verified. When several breakers
are involved, each breaker must be checked individually and it must be verified that the other
involved breakers are not tripped at the same time.
11.2
Periodic maintenance tests
The periodicity of all tests depends on several factors, for example the importance of the installation,
environmental conditions, simple or complex equipment, static or electromechanical IEDs, and so on.
The normal maintenance praxis of the user should be followed. However, Hitachi Power grids'
recommendation is as follows:
Every second to third year
•
Visual inspection of all equipment.
•
Removal of dust on ventilation louvres and IEDs if necessary.
•
Periodic maintenance test for protection IEDs of object where no redundant protections are
provided.
Every four to six years
•
Periodic maintenance test for protection IEDs of objects with redundant protection system.
Railway application RER670
Commissioning manual
Commissioning and maintenance of
the fault clearing system
First maintenance test should always be carried out after the first half year of
service.
When protection IEDs are combined with built-in control, the test interval can be
increased drastically, up to for instance 15 years, because the IED continuously
reads service values, operates the breakers, and so on.
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Commissioning and maintenance of the fault clearing system
Section 11
SEMOD56513-5 v5
SEMOD56517-1 v1
SEMOD56520-5 v5
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