Internal Structure Of Electrical Transformers

1. Iron core: the main body of the magnetic circuit of the oil-immersed transformer, which generates hysteresis loss and eddy current loss during operation and generates heat. In the large-capacity oil-immersed transformer, in order to make the heat generated by the loss of the iron core can be fully taken away by the insulating oil during circulation, so as to achieve a good cooling effect, cooling oil passages are often provided in the iron core.

2. Winding (coil): The winding is the circuit part of the oil-immersed electrical transformers, which is made of insulated copper wire or aluminum wire. The role of the winding is the carrier of current, generating magnetic flux and induced electromotive force. Due to the resistance of the winding itself or the contact resistance at the joint, heat will be generated, so the winding cannot pass a current higher than the rated current for a long time. In addition, when the short-circuit current is passed, a large electromagnetic force will be generated on the windings and the oil-immersed transformer will be damaged. Divided into concentric windings and overlapping windings.

3. Accessories: There are fuel tanks, oil pillows, tap changers, safety air passages, insulating sleeves, etc. Its function is to ensure the safe and reliable operation of oil-immersed electrical transformers.

1) Oil tank: The body (winding and iron core) of the oil-immersed oil-immersed transformer is installed in an oil tank filled with insulating oil-immersed transformer oil, and the oil tank is welded with steel plates. The oil tank of the medium and small oil-immersed transformer is composed of a box shell and a box cover. The body of the oil-immersed transformer is placed in the box shell, and the body of the oil-immersed transformer can be lifted out for maintenance by opening the box cover. The fuel tank is used to dissipate heat and protect the body of the device.

(2) Oil conservator (oil pillow): installed on the oil tank to isolate the inside of the oil tank from the outside world.

(3) Safety air passage (explosion-proof pipe): installed on the top cover of the fuel tank to protect the equipment and prevent damage to the fuel tank in the event of failure. When the oil-immersed transformer fails and a large amount of gas is generated, the pressure in the oil tank increases, and the gas and oil will break through the explosion-proof membrane and spray out to prevent the oil tank from bursting.

(4) Gas relay (gas relay): installed in the pipeline between the oil tank and the oil conservator of the oil-immersed transformer, the main protection device. Inside there is a float with a mercury switch and a baffle that can drive the mercury switch. When the oil-immersed transformer fails, the generated gas accumulates on the upper part of the gas relay, the oil level drops, the buoy sinks, and the mercury switch is turned on to send a signal; when the oil-immersed transformer fails seriously, the oil flow breaks through the baffle, the baffle When deflecting, a set of mechanism is driven to make another mercury switch turn on, send out a signal and trip.

The above is the introduction of common oil-immersed transformer components and the important positions of each part for your reference. If you have any other questions about oil-immersed transformers, please consult our manufacturers or come to our website Learn more about it!