Over Fluxing in Transformer

Causes of Over Fluxing in Transformer As per present day transformer design practice, the peak rated value of the flux density is kept about 1.7 to 1.8 Tesla, while the saturation flux density of CRGD steel sheet of core of transformer is of the order of 1.9 to 2 Tesla which corresponds to about 1.1 … Read more

Differential Protection of Transformer | Differential Relays

Generally Differential protection is provided in the electrical power transformer rated more than 5MVA. The Differential Protection of Transformer has many advantages over other schemes of protection. The faults occur in the transformer inside the insulating oil can be detected by Buchholz relay. But if any fault occurs in the transformer but not in oil … Read more

Restricted Earth Fault Protection of Transformer | REF Protection

Restricted Earth Fault Protection of Transformer An external fault in the star side will result in current flowing in the line current transformer of the affected phase and at the same time a balancing current flows in the neutral current transformer, hence the resultant current in the relay is therefore zero. So this REF relay … Read more

Buchholz Relay in Transformers | Buchholz Relay Operation and Principle

What is Buchholz Relay? Construction of Buchholz Relay 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 … Read more