Abstract
Abstract Electric arc is a complex phenomenon occurring during the current interruption process in the power system. Therefore performing digital simulations is often necessary to analyse transient conditions in power system during switching operations. This paper deals with the electric arc modelling and its implementation in simulation software for transient analyses during switching conditions in power system. Cassie, Cassie-Mayr as well as Schwarz-Avdonin equations describing the behaviour of the electric arc during the current interruption process have been implemented in EMTP-ATP simulation software and presented in this paper. The models developed have been used for transient simulations to analyse impact of the particular model and its parameters on Transient Recovery Voltage in different switching scenarios: during shunt reactor switching-off as well as during capacitor bank current switching-off. The selected simulation cases represent typical practical scenarios for inductive and capacitive currents breaking, respectively.
Highlights
Physical phenomena occurring upon current interruption are very complex
The conclusions drawn from the analyses performed in this paper are summarized below: $ EMTP-ATP simulation software allows for effective and efficient implementation of arc models given by means of differential equations
$ it is clear that the result of the breaking process in terms of Transient Recovery Voltage (TRV) magnitude and voltage shape differ for all models, the results of TRV calculated for cases 1i – 4i and 1c – 4c exhibit similar peak values
Summary
Physical phenomena occurring upon current interruption are very complex For this reason, it is still a challenge to use appropriate arc models for circuit breaker design and insulation coordination studies. The dielectric strength determines the maximum electric stress that the dielectric can withstand without breakdown It is a multi-variable function of the switching process and design of the particular switchgear component. The application of Mayr and Cassie models is recommended by IEC standards for insulation coordination studies to represent the physics of the circuit-breaker [4]. Cassie and Mayr models describe the evolution of the conductance (or resistance) of the electric arc during current interruption process, in accordance with the behaviour of the voltage and current appearing at the circuit breaker terminals. Parameters of the models analysed in this paper are used here based on the research reported in e.g. [1, 3]
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