Advertorial in Transformers Magazine, May, 2024 issue: Transformer bushings - A need for dimensional standardization

Air to Oil Type Transformer Bushings are mounted on the top plate of a transformer tank or on the top plate of the turret, with the oil end of the bushing fully immersed in oil inside the transformer whilst the HV terminal on the Air End is connected to the Transmission line (ACSR Conductor) or Aluminium Bus in the substation.

There are three types of such transformer bushings, based on the configuration of current carrying parts, namely “Draw Lead”, “Draw Rod”, and “Solid Stem”.

In the Draw Lead Type, the transformer lead connection from the winding is passed through the central tube of the bushing and is terminated on the thimble/cable connector by soldering/brazing/crimping. The Air End HV terminal is then connected to the thimble/cable connector either by screwing or through a multi-contact spring. Such draw lead type terminations are usually used in Bushings with a current rating of up to 800 Amps.

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