Periodic Maintenance Tests; Visual Inspection; Maintenance Tests - ABB REL670 Installation And Commissioning Manual

3
3.1
3.2
170

Periodic maintenance tests

Periodic maintenance tests
The periodicity of all tests depends on several factors, for example the importance of the instal-
lation, environment conditions, simple or complex equipment, static or electromechanical relays
etc.
The normal maintenance praxis of the user should be followed. However ABB proposal is to
test:
Every second to third year:
• Visual inspection of all equipment.
• Removal of dust on ventilation louvres and relays if necessary.
• Periodic maintenance test for protection relays of object where no redundant pro-
tections are provided.
Every four to six years:
• Periodic maintenance test for protection relays of objects with redundant protec-
tion system.
Note!
First maintenance test should always be carried out after the first half year of service.
Note!
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, op-
erates the breakers etc.

Visual inspection

Prior to testing, the protection IEDs should be inspected in order to detect any visible damage
that may have occurred (dirt or moisture deposits, overheating, etc.). Should burned contacts be
observed when inspecting the relays, a diamond file or an extremely fine file can be used to pol-
ish the contacts. Emery cloth or similar products must not be used as insulating grains of abra-
sive may be deposited on the contact surfaces and cause failure.
Make sure that all IEDs are equipped with covers.

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 relay setting.
Commissioning and maintenance of
the fault clearing system
Chapter 12