Comem ABB Buchholz Relay

Comem ABB Buchholz Relay

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ABB Comem Buchholz Relays are designed to promptly provide information about internal malfunctioning, giving the possibility to shut down the transformer and prevent its possible destruction.

The relays are designed to detect faults and prevent damage to the oil circuit, induction coils and other components in oil-filled transformers.

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Continuous monitoring of two crucial parameters to ensure correct transformer performance

Transformer outages have a considerable economic impact on the operation of a power supply network. Internal gas accumulation and oil flow are monitored and kept under control by the Buchholz relay. The Buchholz relay is sited in the pipework between the transformer and its conservator and it is filled with oil during normal transformer operation.

Gas Accumulation

When gas is generated in the transformer it rises towards the conservator and collects in the upper chamber of the relay. The oil level drops and the top float triggers alarm switch. Gas shall not freely pass from the relay body and escape into the pipework before the alarm contact has operated.

Transformer Oil Flow to the Conservator

The Buchholz relay is also to operate if oil flow from the transformer tank to the oil conservator. In case the oil flow speed exceed the pre-set value the flow vent operates and switch the trip contact. Transformer outages have a considerable economic impact on the operation of a power supply network. Internal gas accumulation and oil flow are monitored and kept under control by the Buchholz relay.

The Buchholz Relay is a fundamental device for transformers, keeping internal gas accumulation and oil flow monitored and under control.

 
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ABB Buchholz Relay Brochure

Gas accumulation and oil flow

 

Features of the Comem Buchholz Relay


  • Field-proven reliability

  • No false alarms

  • Robust design

  • IP 65, upon request IP 66

  • Special design for On-load tap-changer (OLTC)

    application, hermetic transformers and

    transformers with conservator with rubber bag

 
Partial discharges, leakage currents, hot spots and arcing are phenomena that contribute to degradation of oil insulation performance by generating dangerous gas flow inside the transformer tank.
— Comem
 
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