SIMULATION INVESTIGATION ON REDUCING SINGLE-PHASE AUTO-RECLOSING TIME ON TRANSMISSION LINES USING SHUNT REACTOR AND HSGS

Abstract

This paper focuses on modeling and simulating solutions to reduce the reclosing time of single-phase auto-reclosing (SPAR) circuit breakers on 500 kV transmission lines using EMTP-RV software. The dynamic arc model simulates the phenomenon based on the thermal balance method, incorporating U_50% breakdown voltage of long air gap. This study investigates two approaches to reducing secondary arc duration: (1) the employment of a neutral shunt reactor, and (2) the installation of high-speed grounding switches (HSGS) at both ends of the line.

The solutions reduce reclosing time to 0.77 s and 0.2 s, with corresponding transient recovery voltages (TRV) of 58.3 kV and 14.8 kV for the neutral shunt reactor and HSGS, respectively, ensuring successful SPAR operation. Simulation results demonstrate that the proposed model allows observation of transient processes of current and voltage of the secondary arc during a single-phase short-circuit on the transmission line