The concept of a cheap universal capacitive partial discharge sensor

This following article presents the concept of a cheap universal capacitive sensor for partial discharge (PD) measurement. The authors checked the effectiveness of the device prototype on a MV air-insulated switchgear. For this purpose, a combination of a widely used Transient Earth Voltage (TEV) sensor and a detector with Junction Field-Effect Transistor (JFET) was used. The paper presents the results of PD measurements with TEV sensors depending on the phase of the supply voltage. The conducted experiment is the basis for developing the functionality of the sensor and further research.