The Methodology of Monitoring MOA Insulation Defects Based on Transient Voltage and Current

MOA is a major electrical equipment for limiting the over-voltage of the power system. Its reliability will directly influence the safe operation of the power system. This chapter presents a new online non-real-time monitoring method based on the transient voltage and current which result from the transient process of the power grid. This method applies the transient voltage and current which contains harmonic components to structuring the discriminant function. The discrimination function is a comprehensive criterion by comparing the sample data with the reference database. So this method can monitor and diagnose the insulation defects of MOA based on the maximum value of the discriminant function. At the same time, this method does not require added signal sources. It facilitates diagnosing the insulation defects and it is also very easy to be implemented. It contributes to the application and development of monitoring technology.