Online Localisation of Partial Discharge Using Pulse Propagation Parameters in Medium Voltage Cable Network

In medium voltage power cable, detection and localization of partial discharge (PD) is a challenging process due to presence of joints and ring main units that are located at various places in the network. The propagation of PD pulses in a network system are multifarious because of various cable lengths and impedances. This paper is an attempt to investigate localization of PD pulses source in medium voltage cable by using pulse propagation parameters such as pulse width and rise time. Various experiments were performed in order to find the effect on pulse width and rise time of different cable network system and then pulse parameters were used as basic tool in localization of PD signals. These experiments show that PD pulses attenuation depends on pulse width, rise time and fall time. Incorporation of the proposed technique over a wider network can be very useful as an efficient diagnostic tool for improving the reliability of power supply system.