Transformer is the main part of electric energy transmission and the key equipment of power transmission and transformation system. Its running state directly affects the reliability of power system. Once the transformer is in operation, it will cause serious consequences to the power system. Therefore, it is necessary to use the transformer core grounding current tester to detect the current of the transformer core grounding on a regular basis to prevent the occurrence of faults.

The detection principle is: when the transformer is running with electricity, the current loop will not be formed in the core, so the grounding current is very small, generally within tens of mA; When multipoint earthing, short-circuit turn around core main magnetic flux are equivalent to the situation, grounding line current will increase obviously, and through the circulation size is determined by location and normal pick applaud the relative position of irfpa by transformer core earthing line measuring the size of the fuses in the current, which can effectively determine whether transformer core multipoint earthing phenomenon exists.

Detection data When the detection result of transformer core grounding current is greatly affected by the environment and detection method, the comprehensive comparison can be made through the previous test results, and the judgment can be made according to its changing trend. The transformer core allows a point of grounding, because the transformer is working or testing, its core and parts are in a strong electric field, because of the effect of electrostatic induction, so there will be some suspension potential on the transformer or other metal structure, resulting in the damage of its parts.

It can be seen that when the transformer is running or testing, its iron core and all the metal components should be reliably grounded. If the core is more than a little grounded, a loop is formed between the ground points, and a loop is formed as the main flux passes through this closed loop during transformer operation. This will lead to partial overheating of the transformer core, and in serious cases, it will not even burn, causing some power accidents.