Auto-coupling is the electromagnetic coupling of the meaning of the ordinary side of the transformer coil by electromagnetic coupling, former deputy to pass the energy, the original secondary is no direct electrical contact, while former deputy Autotransformer has a direct electrical contact, It is a low-voltage coils high voltage ring part.

In the current grid, the voltage level from 220KV only have auto-transformer, and more as a liaison between the grid changes. 220KV these little autotransformer.

For dry-type transformers in terms of its dielectric is a resin-like solid, no oil-immersed transformer insulating oil, so called dry. Dry-type transformers because the relatively poor heat dissipation, so the capacity can not do much, usually only a small transformer, the voltage level of 35KV and below are almost of no more than 35KV.

keywords: Line conditioning