New solution for detecting single phase-to-ground faults in resonant-grounded systems

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CIRED 2019 - 661.pdf (553.65 KB)

Paper number

661

Working Group Number

Conference name

CIRED 2019

Conference date

3-6 June 2019

Conference location

Madrid, Spain

Peer-reviewed

Yes

Short title

Convener

Authors

Pócsi, Gergely, Protecta Co. Ltd., Hungary
Radvánszki, Ferenc, Protecta Co. Ltd., Hungary
Weingart, Dr. Ferenc, Protecta Co. Ltd., Hungary
Csipke, György, Protecta Co. Ltd., Hungary

Abstract

The compensation of the earth fault current in resonant-grounded systems is an effective method to increase the chance of clearing the most frequently occurring faults, the single phase-to-ground faults. The closer the value of the inductive reactance of the Petersen coil to the value of the zero-sequence capacitive reactance of the network, the higher the chance for the arc suppression. As a consequence of this tuned near-resonance state, the earth fault current is negligibly small compared to the load current. Therefore, it presents real challenges for the protection devices to detect this type of fault, as the zero-sequence fault current is too small, and the positive sequence impedance cannot be measured correctly between the fault location and the protection device.This paper gives a brief overview of the different earth fault protection methods used on resonant-grounded systems all over the world and introduces a new method for earth fault detection. It also demonstrates the results of its successful real-life application.

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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/20.500.12455/99
http://dx.doi.org/10.34890/193

ISSN

2032-9644

ISBN

978-2-9602415-0-1