Frequency Response of a Real Cable Network and its Impact on Field PD Measurements

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CIRED 2019 - 1492.pdf (1.28 MB)

Paper number

1492

Working Group Number

Conference name

CIRED 2019

Conference date

3-6 June 2019

Conference location

Madrid, Spain

Peer-reviewed

Yes

Short title

Convener

Authors

Abdul Madhar, Saliha, Haefely Test AG / TU Delft, Switzerland
Mraz, Petr, Haefely Test AG, Switzerland
Barrios Pereira, Sonia Raquel, Ormazabal Corporate Technology, Spain
Akroud, Nabil , Ormazabal Corporate Technology, Spain

Abstract

Asset condition monitoring through Partial Discharge (PD) measurements is widely used for preemptive maintenance especially when it comes to cable networks. This is because the physical structure of the cable is a coaxial waveguide that poses as a one dimensional medium for the discharge pulse propagation; which in turn provides the added advantage of pulse/defect localization. Several monitoring systems rely on measurements in the High Frequency (HF) band using wideband sensors when it comes to PD monitoring. However, they fail to realize the radical attenuation of the higher frequencies by the cable. Therefore, this paper presents some important insights towards PD measurements on real cable networks. Firstly, it provides the values of measured attenuation and limits of measurement when it comes to PD measurements in general. It demonstrates the damping of the High Frequencies merely by the influence of the injection loop inductance. Second, it presents the measurement results from an actual MV cable network showing pulse propagation in various network configurations. It makes detailed analysis of the network’s frequency response to explain crucial features such as pulse reflections from interconnections and interruptions. The results of measurement are compared to create a comprehensive argument towards selection of suitable measuring bands/frequencies and the pertinence of measuring at lower frequencies when it comes to power cables.

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Keywords

Publisher

AIM

Date

2019-06-03

Published in

CIRED 2019 Conference

Permanent link to this record

https://cired-repository.org/handle/20.500.12455/419
http://dx.doi.org/10.34890/646

ISSN

2032-9644

ISBN

978-2-9602415-0-1