On-line detection of partial discharge activity in HV cables and accessories using directional coupling techniques

Abstract

This thesis is concerned with the development of new reliable methods of pd detection and the possible use of directional couplers as the sensing element. Directional couplers are used in commercial on-line systems to detect pd sources within XLPE cables. It is important to monitor the cable on-line, as conventional testing requires the cable to be taken out of service causing a disruption to the power supply. A directional coupler uses both a capacitive and inductive efkct to induce two different output signals 6om the same sensor. Directional couplers have the advantage over other detection methods as the two output signals can be used to discriminate a pd signal & om noise. Current on-line pd detection methods have been evaluated and their response under screened laboratory conditions compared with conventional detection methods. The operational conditions likely to be encountered by an on-line measurement system have been established through field measurements at a National Grid Transco substation. Commercially available pd detection systems have also been assessed for performance and suitability for on-line applications. The directional coupler characteristics have been examined and the response of the coupler to alterations in design parameters established. Finally the possible methods of signal acquisition and transmission 6om multiple sensors have been considered.

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