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Liquid-flow control relays for OLTC

The liquid-flow control relay protects the on-load tap-changer (OLTC) and, therefore, the transformer itself. If oil flow occurs from the OLTC head to the oil conservator, the flow vane switches the reed, the circuit breakers are tripped and the transformer is de-energized.

Hitachi ABB Power Grids liquid-flow control relay promptly detects leakages from the energized tap-changer’s oil compartment to the oil conservator and protects the OLTC from damage.

Why Hitachi ABB Power Grids?

  • More than 50 years of experience in manufacturing transformer components
  • Global after-sales and customer support network

Product scope:

  • Liquid-filled power transformers with on-load tap-changer

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