Hitachi Relion 670 Series Commissioning Manual page 261

1MRK506371-UUS Rev. M
Section 13
13.1 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 highlighting 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 magnitudes 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.
13.2 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 practices of the user should be followed. However, Hitachi Energy's
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.
Line distance protection REL670
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 13
SEMOD56513-5 v5
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