Analysis and research on abnormal causes of lightning impulse test of 500kV transformer

Lightning impulse test of transformer is an essential item of equipment delivery test, and it is also to assess the bearing capacity of transformer insulation under lightning impulse. Taking an abnormal lightning impulse test of 500 $\text{kV}$ transformer as an example, the background and method of lightning impulse test are described, and the treatment of lightning impulse anomaly is ...