Identifcation and Location of Partial Discharge Defects in Medium Voltage AC Cables
The presence of partial discharge (PD) in electrical
equipment is the confirmation or indication of an ongoing
degradation of its dielectric insulation. PD study is a widely used
tool for condition monitoring of medium voltage (MV) cables.
The location of the defects can be considered as one of the most
important tasks of diagnosis in underground installations of MV
cables. A lot of references can be found on the location of single
PD sources along the cable. However, several PD defects can be
active simultaneously along a cable section. This paper presents
an experimental study on a MV cable having two PD sources
and noise. Adopting one end measurement technique, a high
frequency current transformer (HFCT) is used to capture the PD
current pulses. A simple approach of identification of the PD
signals originated from different PD sources is presented based
on wave-shape study along with a time domain reflectometry
analysis. The presented measurement methodology and time
domain analysis technique provides a convenient way for
detection and location of more than one PD sources along a cable
Copyright (c) 2019 Muhammad Shafiq, Guillermo Robles, Amjad Hussain, Kimmo Kauhaniemi, Matti Lehtonen
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