Overhead lines - Calculation of the electrical component of distance between live parts and obstacles - Method of calculation

Available format(s)

Hardcopy , PDF , PDF 3 Users , PDF 5 Users , PDF 9 Users

Language(s)

English - French, Spanish, Castilian

Published date

07-04-2001

Publisher

International Electrotechnical Committee

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms, definitions and symbols
  3.1 Definitions
  3.2 Symbols
4 Approach used to derive the electrical distance
5 Overvoltages
  5.1 Classification of overvoltages
  5.2 Temporary overvoltages
  5.3 Slow-front overvoltages
  5.4 Fast-front overvoltages
6 Required withstand voltage of the air gap
  6.1 General
  6.2 Calculation of the required withstand voltage
7 Calculation of the distance associated with the
  overvoltages
Annex A (informative) Relationship between U(50) and the
        gap length, d
Annex B (informative) Example of the calculation of the
        electrical component
Bibliography

Gives guidance for the calculation of electrical distances between live and earthed parts required to prevent air-gap breakdown which may endanger members of the public who legitimately come close to live parts. Applies only to overhead lines designed to operate at more than 45 kV phase-to-phase a.c. It manages the electrical component of distances between conductors and movable objects - vehicles on the ground, vessels on water, persons on top of objects or on the ground, wildlife on the ground (but not airborne), etc.

Committee	TC 11
DevelopmentNote	Stability Date: 2017. (09/2017)
DocumentType	Standard
Pages	0
PublisherName	International Electrotechnical Committee
Status	Current

Standards	Relationship
UNE 207011:2004	Identical
BS IEC 61865:2001	Identical

CLC/TR 50488:2006	Railway applications - Safety measures for the personnel working on or near overhead contact lines
14/30318963 DC : DRAFT DEC 2014	BS EN 61057 - LIVE WORKING - INSULATING AERIAL DEVICES FOR MOUNTING ON A CHASSIS
EN 61057:2017	Live working - Insulating aerial devices for mounting on a chassis
I.S. EN 61057:2017	LIVE WORKING - INSULATING AERIAL DEVICES FOR MOUNTING ON A CHASSIS
CEI CLC/TR 50488 : 2007	RAILWAY APPLICATIONS - SAFETY MEASURES FOR PERSONNEL WORKING NEAR OVERHEAD CONTACT LINES
BS EN 61057:1994	Aerial devices with insulating boom used for live working exceeding 1 kV a.c.
IEC 61057:2017	Live working - Insulating aerial devices for mounting on a chassis
S.R. CLC/TR 50488:2007	RAILWAY APPLICATIONS - SAFETY MEASURES FOR THE PERSONNEL WORKING ON OR NEAR OVERHEAD CONTACT LINES

IEC 61472:2013	Live working - Minimum approach distances for a.c. systems in the voltage range 72,5 kV to 800 kV - A method of calculation
IEC 60050-601:1985	International Electrotechnical Vocabulary (IEV) - Part 601: Generation, transmission and distribution of electricity - General
IEC 60071-2:1996	Insulation co-ordination - Part 2: Application guide
IEC 60060-1:2010	High-voltage test techniques - Part 1: General definitions and test requirements
IEC 60071-1:2006+AMD1:2010 CSV	Insulation co-ordination - Part 1: Definitions, principles and rules

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IEC 61865:2001

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