Reducing air clearance requirements for voltage uprating of overhead line by use of line surge arresters
While uprating an overhead line to a higher voltage level, it is often difficult to achieve the required clearance level for the uprated structure. Use of Transmission Line Arresters (TLAs) is an effective technique in controlling overvoltages and thereby, achieving the required clearance margin. In this paper, suitability of this technique in reducing the clearance margin is discussed. A case study on uprating an existing 275 kV overhead line to 400 kV is investigated here.
Application of Line Surge Arresters for Voltage Uprating and Compacting of Overhead Transmission Lines
Abstract This paper discusses the possibility of using line surge arresters (LSAs) for the reduction of switching overvoltages (SOVs) on voltage uprated transmission lines. The method for the selection of LSA energy class and determination of optimum installation locations was proposed. The method was applied in case of improving the overvoltage protection of the transmission line uprated from 220 kV to 400 kV. The possibility of compacting a 400 kV transmission line by installing LSAs was considered. Since a risk of flashover increases due to the reduction of insulation clearances, an algorithm that estimates the risk of flashover was developed and applied in case of compacting a 400 kV transmission line.
The effect of transient voltages on dielectrics
The author wishes to acknowledge indebtedness to Mr. B. L. Stemmons for his skilful assistance in making experiments and calculations. See Hayden and Steinmetz — Disruptive Strength with Transient Voltages, Trans. A. I. E. E., 1910.