Power transformer internal structure


The main body of the magnetic circuit of the transforme […]

The main body of the magnetic circuit of the transformer generates hysteresis loss and eddy current loss during operation and generates heat. In a large-capacity oil-immersed transformer, the heat generated by the core loss can be sufficiently taken away by the insulating oil during circulation to achieve a good cooling effect, and a cooling oil passage is often provided in the iron core. 2. Winding (coil): The winding is the circuit part of the oil-immersed transformer, which is made of insulated copper wire or aluminum wire. The function of the winding is the carrier of the current, producing magnetic flux and induced electromotive force. Since the winding itself has a resistance or a contact resistance at the joint, heat is generated, so the winding cannot pass a current higher than the rated current for a long time. In addition, the oil-immersed transformer is damaged by a large electromagnetic force generated on the winding by the short-circuit current. Divided into concentric windings and overlapping windings. 3. Accessories: There are fuel tank, oil pillow, tap changer, safety air passage, and insulating sleeve. Its role is to ensure the safe and reliable operation of oil-immersed transformers. 1) Fuel tank: The body of the oil-immersed oil-immersed transformer (winding and iron core) is installed in the oil tank of the oil-immersed transformer oil filled with insulation, and the fuel tank is welded with steel plates. The oil tank of the medium and small oil-immersed transformer is composed of a casing and a cover. The body of the oil-immersed transformer is placed in the casing, and the cover can be opened to lift the body for inspection. The fuel tank is used for heat dissipation and protects the body. (2) Oil storage cabinet (oil pillow): It is installed on the fuel tank to isolate the inside of the fuel tank from the outside. (3) Safety air passage (explosion-proof pipe): Installed on the top cover of the fuel tank to protect the equipment from damage to the fuel tank in case of failure. When the oil-immersed transformer fails and generates a large amount of gas, the pressure inside the fuel tank increases, and the gas and oil will rush out through the explosion-proof membrane to prevent the fuel tank from bursting. (4) Gas relay (gas relay): It is installed in the pipeline between the oil tank of the oil-immersed transformer and the oil conservator, and is mainly used as a protection device. Inside there is a buoy with a mercury switch and a baffle that can drive the mercury switch. When the oil-immersed transformer fails, the generated gas collects in the upper part of the gas relay, the oil level drops, the float sinks, and the mercury switch is turned on to send a signal; when the oil-immersed transformer has a serious fault, the oil flow breaks through the baffle, the baffle When deflecting, a mechanism is actuated to turn another mercury switch on, signal and trip. The above is a description of the various components of the common oil-immersed transformer and the important position of each part for your reference. If you have any other problems with the oil-immersed transformer, please consult our manufacturer or come to our website. Learn more in detail!

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