Energy is one of the energy used in the form of human life. Provide electricity power system includes a number of electrical equipment, part of the equipment in case of failure, will endanger the security of the entire power system. According to the statistical analysis, the power system more than 60% of the power outage was caused by a device insulation defects. In order to timely prevent, ensure power system security, the economy, we must carry out the required work on electrical equipment testing.