Multi-physics field coupling analogue simulation method and system for GIS disconnecting switch in different contact states

Abstract

The invention discloses a multi-physics field coupling simulation method and system for a GIS disconnecting switch in different contact states, and the method comprises the steps: setting three typical contact states of the GIS disconnecting switch, and carrying out the measurement on a GIS disconnecting switch test platform, and obtaining the loop resistance in different contact states; secondly, establishing geometric models of the GIS disconnecting switch in different contact states, and setting material attributes of corresponding areas; comparing the simulation loop resistance with the test loop resistance to adjust the contact condition of the moving and static contacts; setting a physical field control equation, a boundary condition, an initial condition and a coupling variable; and finally, carrying out mesh generation on the solution domain by utilizing a finite element method, and solving the multi-physics field coupling mathematical model. The simulation method is closer to the actual working condition of the disconnecting switch, so that the accuracy and reliability of the simulation result are high. The method and system are beneficial to research of multiple physical fields and characteristics of the GIS disconnecting switch in different contact states, and are of great significance to safe and reliable operation of the GIS.

Description

technical field [0001] The invention relates to the field of power equipment state simulation analysis, in particular to a multi-physics field coupling simulation method and system under different contact states of a GIS isolating switch. Background technique [0002] With the development and evolution of power systems, gas insulated switchgear (GIS) has been widely used in high-voltage substations based on its advantages such as high operational reliability, long maintenance cycle, stable performance, and small footprint. Applications. As a key device in GIS, the disconnector can create an obvious break point, but it does not have the function of arc extinguishing. At the same time, the isolating switch is also a typical mechanical and electrical hybrid device, which is prone to failure during on-site operation. Among them, the deterioration of the mechanical state of the GIS isolating switch and the poor contact of the moving and static contacts caused by long-term frequ...

AI Technical Summary

Problems solved by technology

The test method itself is expensive, and the physical quantities inside GIS are difficult to measure, so it is mainly used to assist verification

However, the existing simulation methods often ignore the influence of the air domain around the GIS, and use the equivalent convective heat transfer coefficient for equivalent, which is different from the actual situation.

And for the different contact states of the isolating switch, the existing simulation has not made a clear explanation, resulting in incomplete simulation results

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