Commissioning And Maintenance Of The Fault Clearing System; Commissioning Tests; Periodic Maintenance Tests; Visual Inspection - Hitachi Relion SAM600 Commissioning Manual

Switchgear control unit

Hide thumbs

Table Of Contents

Table of Contents

1MRK511447-UEN Rev. E

Section 10

10.1

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.

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.

10.2

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 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.

10.2.1

Visual inspection

Prior to testing, the protection IEDs should be inspected to detect any visible damage that may have

occurred (for example, dirt or moisture deposits, overheating).

Make sure that all IEDs are equipped with covers.

10.2.2

Maintenance tests

To be made after the first half year of service, then with the cycle as proposed above and after any

suspected maloperation or change of the IED setting.

Switchgear control unit SAM600-IO

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.