The emergence and development of any industry can not be separated from the progress of science and technology, which is also the promotion of the industry caused by the expanding market demand, prompting the relevant personnel to constantly update their products. So in the processing industry, this requirement is even more. For example, the processing of oil-immersed transformers is also moving from traditional technology to more advanced technology. What are its characteristics? At the same time, what should we pay attention to when using it?
In the main substation of urban rail transit power supply system, the main transformer usually adopts three-phase oil-immersed transformer, which is mainly composed of iron core, winding, oil tank, voltage regulator, radiator, oil conservator, gas relay, insulating sleeve and explosion-proof tube.
The iron core is composed of laminated silicon steel sheets with good magnetic permeability, forming a magnetic flux closed loop, and the primary and secondary windings of the transformer are wound around the iron core. The iron core of oil-immersed transformer is divided into iron core type and shell type. At present, the widely used transformer is of iron core structure. Core iron core consists of iron core column and iron yoke. The iron core of oil-immersed transformer has an oil channel for cooling the iron core, which is convenient for the circulation of transformer oil and also enhances the heat dissipation effect of the equipment. Winding, also called coil, is the conductive loop of transformer. Oil-immersed transformer is wound into multilayer cylinder with copper wire or aluminum wire. Insulating materials are wound on wires to ensure the insulation between wires and between wires and the ground. The oil tank is the shell of the oil-immersed transformer. When the power supply voltage fluctuates, the tap-changer of the transformer is adjusted by the voltage regulator to ensure the stability of the output voltage of the secondary side. There are two types of regulators: on-load regulators and no-load regulators. The radiator is installed on the wall of the oil tank, and the upper and lower parts are connected with the oil tank through pipelines. When there is a temperature difference between the upper oil temperature and the lower oil temperature of the transformer, the oil forms convection through the radiator and flows back to the oil tank after being cooled by the radiator to reduce the transformer oil temperature. The influence of temperature. In order to improve the cooling effect, measures such as self-cooling, forced air cooling and forced water cooling can be adopted. Oil conservator is also called fuel tank.
Gas relay, also known as gas relay, is the main protection device for internal faults of transformer. It is installed in the middle of the oil pipe connecting the oil tank and oil conservator. When a serious fault occurs inside the transformer, the gas relay is connected with the circuit breaker and trips in the same way; When a slight fault occurs inside the transformer, the gas relay is connected to the fault signal circuit. High and low insulating sleeves are located on the top cover of transformer oil tank, and porcelain insulating sleeves are generally used for oil-immersed transformers. The function of the insulating sleeve is to keep the high and low voltage winding leads well insulated from the oil tank and fix the leads. Explosion-proof tube, also known as safety airway, is installed on the transformer oil tank, and its outlet is sealed with glass explosion-proof membrane.