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12. Tap-changer operation monitoring and maintenance
- Whether there is leakage at the connection between the protection relay and the pipeline；
- The condition of the MDU sealing and all electric components；
- If the protective relay alarms, a thorough inspection should be done to the transformer and OLTC. If
necessary, the tap-changer body can be lifted out for inspection.
- Before putting into operation again, OLTC and transformer must be inspected for damages.
Inspection of OLTC head cover, protective relay and MDU should be carried out
regularly.
Please contact Huaming service team if OLTC and MDU have severe problems or
the protective relay actions and it’s not easy to fix on site.
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