Deteccion fallas en sistemas electricos

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High Impedance Faults

Working Group B5.94

December 2009

WG B5.94

High Impedance Faults

Members
Iñaki Ojanguren, Chair (ES)

Corresponding Members
Gustav Steynberg (DE), Jean-Luc Channelière (FR), Laurent Karsenti (FR), Ratan Das (US)
The authors wish to acknowledge the contribution of Jorge Cardenas to the writing of Chapter 5 of this report.

Copyright©2009“Ownership of a CIGRE publication, whether in paper form or on electronic support only infers right of use for personal purposes. Are prohibited, except if explicitly agreed by CIGRE, total or partial reproduction of the publication for use other than personal and transfer/selling to a third party. Hence circulation on any intranet or other company network is forbidden”.

Disclaimer notice“CIGRE gives no warranty or assurance about the contents of this publication, nor does it accept any responsibility, as to the accuracy or exhaustiveness of the information. All implied warranties and conditions are excluded to the maximum extent permitted by law”.

ISBN: 978-2-85873-089-6

Table of contents
1  1.1  1.2  1.3  1.4  2  INTRODUCTION.......................................................................................................................... 1  HIFs in Transmission and Subtransmission ........................................................................... 2  Scope of this document ............................................................................................................. 2  Definitions.................................................................................................................................... 2  Detection Methods Classification ............................................................................................. 3  WORLD-WIDE PRACTICES, EXPERIENCES AND LIMITATIONS OF ELECTRICAL UTILITIES IN MV, HV AND EHV NETWORKS TAKING INTO ACCOUNT THE DIFFERENT GROUNDING METHODS............................................................................................................ 4  Conclusions of Survey ............................................................................................................... 4  HIF DETECTION METHODS. ...................................................................................................... 9  Introduction................................................................................................................................. 9  Summary of available detection methods ............................................................................... 9  Primary detection devices (physical /mechanical) ............................................................... 11  Isolated and resonant groundedsystems ............................................................................. 11  Broken conductor protection (current unbalance) ............................................................... 11  Conclusion................................................................................................................................. 12  NEW PROTECTION SCHEME AND FIELD EXPERIENCE OF MVCOMPENSATED NETWORKS ............................................................................................................................... 13  Introduction ............................................................................................................................... 13  Description of EDF’s MV zero-sequence protection scheme.............................................. 13  EDF’s Field experience in MV neutral compensated network zero sequence protection scheme ....................................................................................................................................... 14  LATEST DEVELOPMENTS FOR HIF DETECTION ................................................................. 16  First example of HIF detection...
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