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Sensors for on-line PD detection in MV power cables and their locations in substations

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4 Author(s)
P. C. J. M. van der Wielen ; Dept. of Electr. Eng., Eindhoven Univ. of Technol., Netherlands ; J. Veen ; P. A. A. F. Wouters ; E. F. Steennis

For developing a system capable of on-line detecting and localizing PDs in MV power cables, the choice of the sensor type is crucial. Sensors for detecting PDs can be divided into two main groups: capacitive and inductive sensors. In this paper, the advantages and disadvantages of these two types of sensors are discussed for on-line application. In multi-conductor cables, e.g. a three-phase belted cable, it is essential to distinguish the different propagation channels. When the cable is under normal operating conditions, all three the phases are energized simultaneously, implying that the PD pulses are propagating through two distinctive propagation channels: the Phase-to-Phase (PP) channel and the Shield-to-Phase (SP) channel. Measuring sensors can therefore also be subdivided with respect to the detected channel. If sensors can detect signals in all three conductors separately, both SP and PP channels are obtained. In this paper different positions in a substation for placing sensors are evaluated, with respect to the measured propagation channels, signal-and interference sensitivity, safety and practical applicability.

Published in:

Properties and Applications of Dielectric Materials, 2003. Proceedings of the 7th International Conference on  (Volume:1 )

Date of Conference:

1-5 June 2003