What abnormal conditions should the transformer in the operation of power fittings be out of operation?

What abnormal conditions should the transformer in the operation of power fittings be out of operation?

Transformers in operation should be taken out of operation under the following conditions.

(1) The sound inside the transformer is very loud, and there is a serious discharge sound.

(2) Under normal cooling conditions, the temperature of the transformer is abnormal or keeps rising.

(3) The explosion-proof pipe bursts or the oil conservator leaks oil.

(4) The color of the oil changes too much, and there is carbon in the oil.

(5) The casing has serious rupture and discharge phenomenon.

(6) Overheating of the joint, fuel injection, and smoke appear,

What are the reasons for the damage to the insulation of the transformer windings of power fittings?

There are usually five reasons for the damage of transformer winding insulation.

(1) The short-circuit fault of the line and the rapid change of the load make the transformer current exceed the rated current or dozens of times. At this time, the winding is displaced or deformed by the action of a large electric torque. In addition, due to the rapid current If it increases, the temperature of the winding will increase rapidly and the insulation will be damaged.

(2) The transformer is overloaded for a long time, and the winding produces high temperature damage to the ring insulation, resulting in short circuit between ministers and layers.

(3) The winding insulation is damp, resulting in a short circuit between the boxes.

(4) Poor contact between the winding joint and the tap changer will cause heat generation, damage local insulation, and cause inter-turn, inter-layer short circuit or joint short circuit.

(5) The power outage of the transformer and the lightning strike will damage the insulation due to overvoltage.