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Anti vibration mounting pads and magnetic switches give high stability against mechanical shocks and vibrations. ATVUS relays are approved by most of the consultants, Power Projects and Electricity Boards in India. Buchholz Relay with Mercury Switches. Uses mercury in switches which is toxic and also a carcinogen.
COMEM Buchholz relais are available with improved corrosion resistance C5 class according to ISO 12944, suitable for off-shore environment and high salinity area.
The Buchholz relay was developed in 1921 by Max Buchholz, Oberrat (senior councillor) at Preu- ?ische Elektrizitats-A.G. (Prussian electricity company) in Kassel. Since that time it has been an important protection and monitoring device for insulating liquid filled transformers with conservator and choke coils. It also allows
The Buchholz relay is sited in the pipework between the transformer and its conservator and it is filled with oil during normal transformer operation. 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
General Features. 1.1 Characteristics. The gas-actuated protective relay is designed to detect faults as well as to minimise the propagation of any damage, which might occur within oil-filled transformers. The relay is therefore particularly effective in case of: - short-circuited core laminations. - broken-down core bolt insulation.
Buchholz relay in transformer is an oil container housed the connecting pipe from main tank to conservator tank. It has mainly two elements. The upper element consists of a float. The float is attached to a hinge in such a way that it can move up and down depending upon the oil level in the Buchholz relay Container.
The Buchholz relay protects the transformer from internal faults. It is the gas actuated relay. The Buchholz relay is placed between the main tank and the conservator. Such type of relay is used in the transformer having the rating higher than 500KVA. It is not used in small transformer because of economic consideration.
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MOUNTING THE BUCHHOLZ RELAY TO THE TRANSFORMER. Buchholz Relay is intended to work in a horizontal positions. it is connected with a 5° positive angle to the horizontal axis with the arrow mark on the relay pointing to the oil conservator. Buchholz Relays are manufactured to allow both thread and flange.
APPLICATION. Buchholz Relay is a protection device for monitoring the gas and oil movements in oil immersed transformers. It is designed to detect the faults and minimize the propagation of any damage which might occur within oil circuit, induction coils etc. The examples of the faults which could cause gas accumulation

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March 2018