Transformer buchholz relay

Good information about the operation of Buchholz relay and how it protects the transformer. This is used to provide traffic data and reports to the authors of articles on the HubPages Service. This service allows you to sign up for or associate a Google AdSense account with HubPages, so that you can earn money from ads on your articles. The transformer oil gets decomposed and gas bubbles are produced. Working principle Buchholz relay relies on the fact that an electrical fault inside the transformer tank is accompanied by the generation of gas and if the fault is high enough it will be accompanied by a surge of oil from the tank to the conservator Whenever a fault occurs inside the transformer, the oil in the transformer tank gets overheated and gases are generated.

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A generic designation for this type of device is "gas detector relay". Replacement is possible without any interference to the oil circulating system.

M20 x 1,5 2 Pieces. A float switch in the relay is used to initiate an alarm signal. It is possible to draw reliable and meaningful conclusions regarding sources of error in the transformer or on-load tap-changer from the analysis results e.

What is the function of BUCHHOLZ relay in oil-filled transformers?

Operation of Buchholz Relay. Buchholz relay can be used in the transformers having the conservators only.

Reed switches Number of switching contacts: If an electrical arc forms, gas accumulation is rapid, and oil flows rapidly into the conservator. No data is shared with Paypal unless you engage with this feature. Google provides ad serving technology and runs an ad network.


Oil level will gradually fall till the upper switch operates the alarm circuit. Buchholz relay is not provided in relays having rating below kVA from the point of view of rlay considerations.

The relay was first developed by Max Buchholz — in Accessories for the Buchholz Relay: The lower float may also falsely operate if the oil velocity in the connection pipe through, not due to an internal fault, is sufficient to trip over the float. This is used to provide data on traffic to our website, all personally identifyable data is anonymized.

The contacts of this mercury switch are closed and an alarm circuit energized.

Hence, during minor faults, the lower float is unaffected. We are a leading manufacturer of Buchholz relay for transformers and put a lot of efforts in continuously developing special designs matched with customers requirements.

Thank you very much, it saved my time. If the fault persists the oil level falls still further and the lower mercury switch operates the trip circuit which totally disconnects the equipment from the supply.

More severe types of faults, such as short circuit between phases or to earth and faults in the tap changing equipment, are accompanied by a surge of oil which strikes the baffle plate and causes the mercury switch of the lower element to close.

An oil ingress into the reed switch is therefore impossible.

There is petcock provided at the top of the relay. In this case, the lower float will cause the lower mercury switch which will trip the transformer from the supply, i.

Archived from the original on Names like "beechwood relay" or "beech relay" are an indication of incorrectly translated German language manuals of the "Buchholz rleay ". Installed in the pipeline between tank and oil conservator, it reacts to faults which occur inside the transformer. If a fault occurs in the transformer, a pressure wave surge is created in the oil.

The lower float moves downwards and actuates the lower reed switch which can be used to deactivate the transformer. The upper element consists of a float. Flammable gas found in the relay indicates some internal fault such as overheating or arcingwhereas air found transfofmer the relay may only indicate low oil level or a leak.

Buchholz Relay MBP for Transformers

This trip circuit will operate the circuit breaker and isolates the transformer. The die-cast aluminum housing in combination with the C5-M powder coating offers the highest level of UV and corrosion resistance. Downloads Contact Persons Contact Form.

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