變壓器套管是變壓器內部的高、低壓引線引到油箱外部的出線裝置，具有規定的電氣強度和足夠的機械強度。與套管連接的線圈，其電壓等級決定了套管的絕緣結構。套管的使用電流決定了導電部分的截面和接線頭的結構。

The transformer bushing is the outlet device that leads the high and low voltage leads inside the transformer to the outside of the oil tank, with specified electrical strength and sufficient mechanical strength. The coil connected with the bushing ,its voltage level determines the insulation structure of the bushing. The using current of the bushing determines the cross section of the conductive part and the structure of the Wiring head.

使用條件和性能：

1.環境溫度：-45度~+40度。

2.海拔高度：普通型套管不超過1000米，加強型及防污型套管不超過2500米。

3.普通型套管適用于輕污穢地區，防污型套管適用于重污穢地區。

4.安裝角度：垂直或傾斜角度不超過30度。

 Service conditions and performance of ordinary bushing

1. Ambient temperature: Minus 45 centigrade to 45 centigrade.

2. Altitude: ordinary bushing shall not exceed 1000m, and reinforced and Anti-fouling bushing shall not exceed 2500m.

3. Ordinary bushing is suitable for light pollution areas, and anti pollution bushing is suitable for heavy pollution areas.

4. Installation angle: the vertical or inclined angle shall not exceed 30 degrees.

二、普通套管電氣性能  Electrical performance of common bushing