Design of locating system for damp fault location of inner and outer casing based on secondary end screen measurement

In the process of fault location, it is difficult to determine the specific position of the core by measuring the average moisture content of the capacitor core. Therefore, it is an urgent problem to determine the moisture content of the core in the casing by indirect electrical method. In order to solve this problem, the location of wetted parts of inner and outer casings is studied, and a design method of locating the wetted parts of inner and outer casings based on the second end screen measurement is proposed. The hardware structure of the system is improved, and the system software operation process is optimized to realize the location of wetted parts of inner and outer casing pipes. The experimental results show that the practical application effect of the method to determine whether the bushing is affected by moisture is better by using the complex capacitance ratio between the end shield and the main insulation and the complex capacitance ratio of the end shield of the guide rod, which provides a basis for the diagnosis of the casing moisture.