Deteccion fallas en sistemas electricos

402
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.

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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...