Comparison of on-line partial discharge detection methods for HV cable joints

The capacitive coupler, acoustic emission (AE) sensor and radio frequency current transducer (RFCT) have been used to detect partial discharge (PD) activity within a 132 kV prefabricated cable joint containing a known defect. Although each of the three methods has been applied individually under dif...

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Bibliographic Details
Published in:IEEE transactions on dielectrics and electrical insulation 2002-08, Vol.9 (4), p.604-615
Main Authors: Tian, Y., Lewin, P.L., Davies, A.E.
Format: Article
Language:English
Subjects:
Acoustic emission
Acoustic sensors
Acoustic signal detection
Acoustic transducers
Cable shielding
Cables
Capacitive sensors
Fault location
Interference
Investigations
Joining
Methods
On-line systems
Partial discharges
Position (location)
Pulse shape
Radio frequency
Sensors
Sheaths
Transducers
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Summary:The capacitive coupler, acoustic emission (AE) sensor and radio frequency current transducer (RFCT) have been used to detect partial discharge (PD) activity within a 132 kV prefabricated cable joint containing a known defect. Although each of the three methods has been applied individually under different situations, a comprehensive investigation and comparison of these three methods has not yet been made. Results obtained were compared to measurements made using the conventional electrical detection method. The quantification of the capacitive coupler measured signal in mV with a discharge apparent quantity in pC has been investigated and an on-line quantification method proposed. The capacitive coupler has good detection sensitivity and PD location can be realised by studying the time of Right between signals from two sensors. The difference in pulse shape, spectrum and time of flight between an internal discharge and external interference has been investigated. The AE approach has the advantage of being free from electrical interference. However, investigation indicated that AE signals were significantly attenuated within the cable joint. RFCTs were used to detect the discharge current flowing through the cable sheath. Where the detection sensitivity was low, a wavelet de-noising method was applied to process the RFCT signals and proved to tie effective in increasing the measurement signal to noise ratio.
ISSN:1070-9878
1558-4135
DOI:10.1109/TDEI.2002.1024439