Breakdown location method for on-site impulse withstand voltage test based on distributed HF current

The impact withstand voltage test has been successfully applied to the handover test of GIS equipment, but there is a lack of targeted breakdown location methods. This paper proposes a breakdown location technique based on the distributed high-frequency current method, explains the principle of the technique, the composition of the location system, the specific implementation steps under different working conditions, and carries out simulation analysis according to the field conditions of the impact withstand voltage test, and conducts tests in the field. The results show that the breakdown location technology based on the distributed current method can be applied to the GIS field impact withstand voltage test, which is easy to install and effectively reduces the location time of the breakdown accident on site; in the specific implementation of the breakdown location of the distributed current method, the rising edge and transient amplitude of the grounding current waveform are related to the distance of the occurring grounding gas chamber, and the steady state amplitude is not related to the distance of the breakdown point; the location potential can be an effective trigger for the breakdown system signal.