When the transformer is affected by load and other factors during operation, it will inevitably be affected by a certain amount of current. Among them, although the circuit breaker can quickly cut off the circuit for some reason, the short circuit of the socket is particularly harmful to the transformer winding. The device does not work, causing the transformer coil to deform in a short time under the action of the short-circuit current and the power supply. In severe cases, the coil phase will be short-circuited and the winding will burn out.

The transformer winding is deformed and the external force is destroyed. It is mainly caused by the impact, impact and displacement of the winding caused by collision and impact during installation or transportation. For previous failures, we usually strengthen the maintenance of relay protection devices. Check to ensure the timeliness and stability of the action. After the transformer is put into the factory, before and after installation, the internal consistency of the transformer winding deformation tester must be checked.

Winding deformation is a hidden danger that affects the safe operation of the power system. In recent years, as the capacity of the power system has increased, the short-circuit capacity has also increased, and the number of accidents that cause winding damage after the socket is short-circuited has also increased. Due to the change of the insulation distance or the damage of the insulating paper, when an overvoltage occurs, the winding occurs between the windings or between the turns or under a long-term voltage. The insulation damage gradually expands, and finally leads to insulation damage. The safety operation faces a crisis. Secondly, after the winding is deformed, the mechanical Performance will decrease. When a short-circuit fault is encountered, the fault occurs immediately due to the inability to withstand the impact force, and it is very difficult to find its deformation in conventional electrical tests (such as insulation resistance measurement, transformer ratio measurement, capacitance measurement, etc.), so it is very important to measure the deformation of the transformer winding .