http://www.paper.edu.cn
Study on Domain Coupling of Multi-physical
Parameters for High Voltage SF6 Circuit
Breaker
Yundong Cao, Xiaoming Liu, and Erzhi Wang
Department of Electrical Engineering
Shenyang University of Technology
Shenyang, PRC 110023
caoyd@sut.edu.cn
Abstract
Coupling of multi-physical parameters in extra high voltage SF6 circuit breaker (UHV
SF6 CB) has been investigated. For 2D combined mathematical model of electric field,
flow field and
−k turbulent flow developed, the coupling condition of
multi-physical field of CB was established. And the computations have been carried
out for 500kV 1-break SF6 CB. The aerodynamic behavior and electrical
characteristics varying with interrupting course have been investigated. In addition,
the dielectric recovery characteristics (DRC) of the 500kV 1-break SF6 CB has been
obtained, the visualization of breaking course has been realized.
Keywords: coupling field, domain decomposition, numerical simulation, puffer
circuit breaker
1 Introduction
SF6 CBs have been considered as the most efficient and reliable protective devices in electrical
transmission network. Nowadays, SF6 CBs have been widely applied in extra and ultra HV class. The
interrupting course in CB involves different complicated phases [1]. In order to get a better prediction of
the insulating and interrupting property and understanding of the interrupting process during the switching
action, a rational model, which describes the electrical and aerodynamic parameters and their interactions,
needed to be established. However, the computation of flow field within the SF6 CB is extremely difficult
due to the complex flow path with stridesonic flow, active, viscous, compressible, variable boundary, and
due to some intricate physical phenomena, such as the shock wave and vortices during interrupting.
Recently, inherent weakness has been reported lies in the simplifications of computing structure and
modeling.
In this paper, the coupling electric and aerodynamic physical model, which takes the 2D
−k
turbulent
equation into consideration, has been established. And in order to develop the evaluation method to solve
the coupling numerical problem with complex flow path and space-time processing synchronously, the
improved combined method of FVM and TVD scheme was developed [2]. And some novel methods were
proposed and applied, such as the domain decomposition, boundary coupling, sliding grid generation, and
data transfer online.
-1-