Comem ABB Buchholz Relay
Comem ABB Buchholz Relay
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.
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.
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.”
Talk to our team
Get more information on the Comem transformer devices
