NDLI: Modelling for switching impulse breakdown of live working gaps between equipotential worker and transmission towers

Content Provider	IET Digital Library
Author	Fang, Yaqi Wang, Linong Li, Rui Gao, Jiachen Song, Bin Liu, Kai
Abstract	Air gap discharge voltage is the key parameter to determine the minimum approach distance for live working. In this study, a mathematical–physical model for predicting 50% discharge voltage of the transmission line air gaps considering the effect of live line worker is developed based on the continuous leader inception criterion. Also, the tower structure coefficient S T is proposed to represent the influence of various tower structures and S T is calculated by finite element method. Finally, the switching impulse discharge tests of the equipotential worker-tower structure gaps are carried out on 750 kV transmission lines to verify the proposed model. The research results show that the errors between the calculation and experimental data are within ±4.03% which demonstrates the feasibility of discharge voltage prediction for complicated live working gaps. This model offers a possible way to determine the safety air gap distance for live working by analytical and numerical calculation rather than costly and time-consuming experiments.
Starting Page	1271
Ending Page	1278
Page Count	8
ISSN	17518687
Volume Number	14
e-ISSN	17518695
Issue Number	Issue 7, Apr (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/14/7
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2019.0789
Journal	IET Generation, Transmission & Distribution
Publisher Date	2020-01-13
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	50% Discharge Voltage 750 KV Transmission Lines Air Gap Air Gap Discharge Voltage Complicated Live Working Gaps Connector Continuous Leader Inception Criterion Dielectric Breakdown And Discharges Discharge Voltage Prediction Discharges (electric) Equipotential Worker-tower Structure Gaps Finite Element Analysis Finite Element Method Impulse Breakdown Insulator Live Line Worker Mathematical–physical Model Minimum Approach Distance Overhead Power Line Poles And Towers Power Line Supports Power Overhead Line Power Transmission Line Protection Apparatus Safety Air Gap Distance Switching Impulse Discharge Tests Tower Structure Tower Structure Coefficient Transmission Line Air Gaps Transmission Towers Voltage 750.0 KV
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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