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Title: Determining the Minimum Phase‐to‐Phase Gap Distance for Unconventional Transmission Lines Using Numerical Method
ABSTRACT With the increasing demand for power transmission, compact, high surge impedance loading (HSIL) high‐voltage transmission lines have emerged as a viable solution due to their reduced land acquisition costs and higher power delivery capability. The compactness of a transmission line depends on effective insulation coordination, particularly in determining the phase‐to‐phase clearance, which is governed by the critical flashover voltage under switching and lightning overvoltage conditions. Traditional methods for phase‐to‐phase clearance rely on empirical formulas derived from experimental data, which are convenient for conventional high‐voltage lines. However, unconventional HSIL lines require a faster and more adaptable evaluation method, as they involve optimized conductor positioning to reduce right‐of‐way requirements while enhancing natural power loadability. This study presents a simplified numerical approach to determine the minimum phase‐to‐phase gap, utilizing arc propagation viability curves, and offers an efficient alternative to conventional empirical methods. The proposed method was successfully applied to a 500 kV conventional line as well as 500 and 735 kV unconventional line designs, demonstrating its capability in accurately assessing insulation requirements. Results reveal that the method can support reduced gap clearances while still maintaining reliability, thereby validating its usefulness in optimizing compact transmission line configurations.  more » « less
Award ID(s):
2306098
PAR ID:
10644477
Author(s) / Creator(s):
 ;  
Publisher / Repository:
DOI PREFIX: 10.1049
Date Published:
Journal Name:
IET Generation, Transmission & Distribution
Volume:
19
Issue:
1
ISSN:
1751-8687
Format(s):
Medium: X
Sponsoring Org:
National Science Foundation
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