Transformer bushing function

The transformer bushing is an important component of the transformer. Although its structure is relatively simple, it plays a key role in the safe and stable operation of the transformer, mainly reflected in the following aspects: ### 1. Insulation Function This is one of the core functions of the transformer bushing.   The lead wires (high and low voltage leads) of the internal windings of the transformer need to be led out from the inside of the oil tank to the outside, while the oil tank shell is grounded. The bushing, through its own insulating materials (such as porcelain, resin, oiled paper, etc.), isolates the high-voltage leads from the grounded oil tank shell, preventing short circuits or electric leakage between the high-voltage leads and the oil tank. This ensures that high-voltage electricity can be transmitted safely and reliably, avoiding equipment failures or safety accidents caused by insulation failure. ### 2. Supporting and Fixing Function The bushing needs to bear the weight of the transformer's lead wires and fix them stably on the bushing mounting hole of the oil tank.   Whether it is the thick and heavy leads on the high-voltage side or the leads on the low-voltage side, they need to be mechanically fixed through the bushing. This prevents the leads from shifting or shaking due to vibration, electromagnetic force and other factors during the operation of the transformer, avoids damage to the insulation caused by friction and collision between the leads and other components, and ensures the stability of the overall structure. ### 3. Current Conduction Path Function The bushing is internally equipped with a conductive rod (or conductive tube), which serves as a "bridge" connecting the internal windings of the transformer to the external circuit.   The current from the internal windings is transmitted through the conductive rod to the external terminals of the bushing, and then connected to the external power grid (or load), forming a complete current path. Therefore, the conductive part of the bushing needs to have good conductivity to reduce losses (such as resistance loss) during current transmission and ensure efficient transmission of electrical energy. ### 4. Sealing Function The inside of the transformer oil tank is usually filled with insulating oil (or gas) to achieve insulation and heat dissipation. The connection between the bushing and the oil tank needs to be strictly sealed to prevent leakage of insulating oil (or gas).