Failure mechanisms of shielded power cable related to high ground shield resistance and/or insulation of neutral wires from the ground shield

Author

Boggs, Steven A.

Author_Institution

Inst. of Mater. Sci., Connecticut Univ., Storrs, CT, USA

Volume

17

Issue

2

fYear

2002

fDate

4/1/2002 12:00:00 AM

Firstpage

295

Lastpage

301

Abstract

A number of conditions can cause separation of the neutral wires from the semiconducting ground shield or cause a large increase in the resistivity of the ground shield. Such conditions can lead to (i) the ground shield becoming effectively floating or (ii) the ground shield acting as a dielectric rather than conductor. In either case, this can lead to partial discharge under normal operating voltage and/or lightning surge-induced flashover between the neutral wires and ground shield, conditions which can cause cable failure. The theoretical context of these conditions is examined, after which a concrete example which has resulted in field failures is provided

Keywords

cable shielding; earthing; electrical resistivity; failure analysis; flashover; partial discharges; power cables; conductor; dielectric; failure mechanisms; finite element computations; ground shield resistivity; high ground shield resistance; lightning surge-induced flashover; neutral wires insulation; normal operating voltage; partial discharge; semiconducting ground shield; shielded power cable; Conductivity; Conductors; Dielectrics; Failure analysis; Lightning; Partial discharges; Power cables; Semiconductivity; Voltage; Wires;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/61.997885

Filename

997885