At present

large-capacity distribution transformers and new energy transformers are widely used

the low-voltage lead wire used in this transformer need to occupy a larger fuel tank space. A new type of low voltage lead wire structure can effectively reduce the size of fuel tank and has been applied in pilot. After studying the magnetic circuit of the clamp with the new lead structure

it is found that although the overall magnetic motive force of the clamp is zero

there are local magnetic flux changes of the clamp. The results show that the local magnetic induction intensity of the low voltage clamp is higher and the loss of the clamp is increased obviously. It shows that the new lead wire structure has defects and local overheating risk. The load loss of the actual case is measured to verify the accuracy of the simulation results.