Do you know the protective features of Type R power transformers?
The main function of the power transformer is to rise and fall voltage, safety isolation and matching impedance. It is an electronic component that uses electromagnetic fields to induce each other to convert voltage, current and impedance. In our daily applications, due to various reasons caused by transformer failure, how is our power transformer protected?
Transformer protection methods are mainly as follows:
1. Transformer overheat protection: When the temperature of the transformer suddenly rises to a certain degree during operation, the transformer overheat protection device will start. This is to prevent the transformer temperature is too high to cause damage to the insulation material, resulting in the risk of transformer or equipment burning. Mining transformers usually have strict overheat protection requirements for the transformer.
2. Transformer differential protection. Current velocity break protection: This protection is mainly to protect the short circuit between the phases of the transformer winding or lead line. Ground short circuit protection between the ground current and the number of turns wound.
3. Transformer overcurrent protection: It mainly protects the transformer bypass current caused by the external fault of the transformer, and serves as the reserve protection of differential protection and gas protection when the transformer fails internally, as well as the reserve protection of the adjacent bus or line.
4. Transformer overload protection: overload protection is usually used for signals. In most cases, the overload current of the transformer is symmetrical. Therefore, overload protection can be achieved only by connecting a phase current relay and acting on the signal through a certain delay.
5. Transformer overexcitation protection: mainly to protect the transformer overexcitation does not exceed the allowable limit. The purpose is to detect the overexcitation of the transformer, send a signal or trip in time, so that the overexcitation of the transformer does not exceed the allowable limit, and prevent the transformer from being damaged due to overexcitation.
The above points are some faults and protection methods that transformers will encounter under abnormal work. With these protection methods, the insecurity of our transformers in case of emergency is greatly reduced. Let’s check the problem in time, make an accurate solution and treatment, and improve the safety of the transformer.