Transformer Buchholz Relay Working

It is the gas actuated relay.

Transformer buchholz relay working. Check the following buchholz relay diagram to understand the working principle and construction. Sometimes due to oil outflow on the major tank air bubbles may build up in the upper part of the buchholz container which may also source a drop of oil level in it and alarm circuit will strengthen. Such type of relay is used in the transformer having the rating higher than 500kva. Buchholz relay in a transformer is an oil container housing the connecting pipe from the main tank to the conservator tank it has mainly two elements.

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. This means lowering the location of the float and thus rolling the mercury switch. It is not used in small transformer because of economic consideration. The classic buchholz relay has to comply with the requirements of the din en 50216 2 standard.

What is buchholz relay. Depending on the requirements it is equipped with up to four 2 per float switches or change over switches which can either send a light signal or switch off the transformer. The relay was first developed by max buchholz 1875 1956 in 1921. Buchholz relay diagram working principle.

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. This relay is mainly used in oil immersed transformer for providing protection against all types of internal faults. Working principle of buchholz relay. The buchholz relay protects the transformer from internal faults.

It is a type of oil and gas actuated protection relay. The upper element consists of a float. The transformer is filled with hydrocarbon oil for the insulation of. The buchholz relay is placed between the main tank and the conservator.

The switches of the contacts stopped and an alarm circuit strengthened. Buchholz relay is a safety device which is generally used in large oil immersed transformers rated more than 500 kva. Buchholz relay is located in the pipeline connecting the transformer main tank and the conservator. As we proceed further we will learn the construction and working principle of the buchholz relay.