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

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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.
Table of content
Keywords
Publisher
AIM
Date
2019-06-03
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