Nonlinear secondary arc model use for evaluation of single pole auto-reclosing effectiveness

Abstract

Purpose -The purpose of this paper is to discuss two evaluation methods of single pole autoreclosing process effectiveness in HV transmission lines. Secondary arc current and recovery voltage results obtained by load flow calculation are compared to the results obtained by the time domain simulations. Moreover, a nonlinear secondary arc implementation is presented. Design/methodology/approach -A computer simulation studies were performed using DIgSILENT PowerFactory ® software to analyse phenomena during single phase to earth short circuit and during single pole circuit breaker opening. Possibilities of electric arc extinction for different earthing solutions of shunt reactors were examined. Findings -The authors indicate, that precise representation of secondary electric arc in power system studies could lead to different conclusion than analysis carried out on simplified arc models. Recommendations for line construction (i.e. earthing reactor installation) and line operation (i.e. prolongation of dead time during auto-reclosing) based on time domain simulations are less restrictive than resulting from the traditional steady-state calculation approach. Originality/value -An implementation of mathematical model of nonlinear secondary arc for DIgSILENT PowerFactory ® software is presented. The model could be used during the process of design of HV transmission line, to assess its proper operation, to calculate dead time during single pole reclosing or to evaluate the necessity of installing additional earthing reactors.

Magnetic and capacitive couplings influence on power losses in double circuit high voltage overhead transmission line

“…Each circuit is equipped with two shunt reactors SRA and SRB located at both ends of the line (Substations A and B). The shunt reactors of rating 50 Mvar at Substation A and 72 Mvar at Substation B are designed to provide line-reactive power (charging power) compensation (Klucznik et al , 2015; Lubosny et al , 2015; Klucznik et al , 2014). The transmission line connection diagram is shown in Figure 1.…”