Causes of overheating of secondary terminals of Power Current Transformer

The reason for the overheating of the secondary terminals of Power Current Transformer: When the shorting lugs of the secondary terminals of the Power Current Transformer that are not connected to the load are not pressed, the terminal connection heats up, and the Power Current Transformer sometimes has electromagnetic noise. Once the load increases, the noise also follows The increase is also closely related to the ambient temperature. The sound starts to be abnormal when the ambient temperature is around 35 degrees Celsius. The power current transformer's detachable current terminal connector is not tightly connected. When the load is small, the terminals that are not crimped tightly will not heat up significantly, and it is not easy to find. When the operation mode is changed or the primary side load is too large, the through power on the primary side increases and the current increases, and the secondary side current of the Power Current Transformer also starts to increase accordingly, and the terminals that are not tightly crimped will overheat. The poor contact of the secondary side terminal connecting piece of Power Current Transformer causes the contact resistance value to increase. When the current passes through, it generates heat, which causes the temperature of the local contact surface to gradually increase, and the surrounding material heats up. The heat dissipation in the box is not good, and the terminal contact surface The oxidation speeds up and the resistance value further increases. Long-term heating and vibration will loosen the terminals. Starting from the overheated contact surface, the surrounding terminal blocks will gradually overheat and melt, and the burned area will gradually increase. There are problems with the quality of Power Current Transformer terminals, such as irregular screw threads of bolts, thin insulating plastics, insufficient strength, and easy slippage, damage or breakage during installation.