Water heater transformer: Transformers are important electrical equipment in the power system and are widely used in substations of different voltage levels. Power transformers are static equipment that can operate continuously. Compared with transmission lines and generators, although the operation is more reliable and the chance of failure is less, most transformers are installed outdoors and are greatly affected by natural conditions. They are also affected by connected loads and power sources, system failures, especially modern power systems, which use more and more large-capacity power transformers with high voltage levels, expensive construction costs and complex structures. If it is damaged due to failure, it will cause huge economic losses. In addition, transformer failure will not only affect the reliability of the power supply, but also greatly affect the stable operation of the power supply system.
Transformer faults can be divided into internal faults and external faults.
The internal fault of the transformer means that the internal fault of the vehicle body is a fault that occurs in the transformer oil tank. It includes interphase short circuits between windings, single-phase ground short circuits of windings or wires, and winding-to-turn short circuits. Intermittent arcing or local overheating can also cause various failures during development.
External transformer faults refer to various inter-phase short circuits or single-phase ground short circuits of the external wires of the fuel tank. Transformer faults, especially internal arc faults, will not only damage the winding insulation layer and burn the iron core, but also produce a large amount of vaporized gas, which leads to fuel production. The storage tank exploded, so when the transformer fails, the protection device should quickly remove the faulty transformer.
The abnormal working state of the water heater transformer mainly includes: overcurrent caused by external phase short circuit of the transformer, external ground short circuit, cooling system fault and overload, overcurrent and neutral overvoltage caused by abnormal transformer overvoltage and low frequency. Large-capacity transformers will be overexcited under working conditions, and the long-term abnormal operation of the transformer will cause the windings and iron cores to overheat and damage the insulation. The protection device should send out alarm signal in time and take corresponding measures. Therefore, it is necessary to take corresponding protective measures to avoid a series of problems.