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5.2 Excessive current taken by relay
Transformer damaged
Incorrect frequency of supply – this is marked on the front of the module
Shorting switch not opening
5.3 Output contacts not changing state
Operating push rods not in position
Check output terminals with reference to diagram
Internal wiring damaged
Contamination of contacts
Contacts should be cleaned with the burnishing tool, supplied in relay tool kits.
On no account should knives, files or abrasive materials be used.
Check mechanical settings as per Section 4.
Section 6. SPARES
When ordering spares, quote the full relay model number and any component
reference numbers, or briefly describe the parts required.
Should the need arise for the equipment to be returned to ALSTOM T&D Protection &
Control Ltd for repair, then the form at the back of this manual should be completed
and sent with the equipment together with a copy of any commissioning test results.
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