EN Transforner Bushing 1KV/1000A

1.definition

The transformer bushing is the main insulation device outside the transformer tank. The outgoing lines of the transformer winding must pass through the insulation bushing to insulate between the outgoing lines and between the outgoing lines and the transformer shell, while also serving to fix the outgoing lines.

2.Classification

Due to different voltage levels, insulation sleeves come in various forms such as pure ceramic sleeves, oil filled sleeves, and capacitor sleeves. Pure porcelain bushing is commonly used in transformers with a voltage of 10kV and below. It involves threading a conductive copper rod through the porcelain bushing, which is insulated with air inside; Oil filled bushing is commonly used in 35kV level transformers. It is filled with oil in a porcelain bushing, with a conductive copper rod inserted inside the porcelain bushing and insulated paper wrapped around the copper rod; condenser bushing is used on high-voltage transformers above 100kV, consisting of a main insulated capacitor core, upper and lower porcelain parts with external insulation, connecting sleeve, oil conservator, spring assembly, base, equalizing ball, measuring terminal, wiring terminal, rubber gasket, insulating oil, etc.

3. Requirement

Transformer bushing is an insulation bushing that leads the high and low voltage leads inside the transformer to the outside of the oil tank. It not only serves as a ground insulation for the leads, but also serves as a fixed lead. The transformer bushing is one of the current carrying components of the transformer. During the operation of the transformer, it passes through the load current for a long time. When a short circuit occurs outside the transformer, it passes through the short-circuit current. Therefore, there are the following requirements for transformer bushings:

(1) Must have specified electrical strength and sufficient mechanical strength.

(2) Must have good thermal stability and be able to withstand instantaneous overheating during short circuits.

(3) Small in appearance, small in quality, good in sealing performance, strong in versatility, and easy to maintain.