Current transformer, the major primary equipment
in power system, can transform a large primary current into the
standard 5A or 1A current. It provides current for the measure
device and the coil of relay protection, meanwhile makes the
primary equipments isolate from the secondary equipments.
With the development of grid, SF6 current transformers have
been widely used. Once the fault of the internal insulation
support in SF6 current transformer appears, it will threat the
safe operation of power systems. In recent years, the fault
accidents of current transformer have occurred form time to
time. This paper introduces the fault conditions of 500kv current
transformer in the area under the jurisdiction of Xiamen EHV
Power Transmission and Transformation Bureau. After it be
sent back to factory and disassem