Abstract
A surface discharge fault of 220kV GIS basin insulator during power transmission has been analyzed. Combined with on-site disassembly inspection, data from previous tests and structural design, the fault point is determined and the fault cause is preliminarily analyzed. In order to verify the correctness of the analysis results, this paper uses the finite element method to mathematically model the accident basin insulator, and formulates the boundary conditions for the calculation of the electric field inside the basin insulator. The simulation results show that there is a distorted electric field on the surface of the basin insulator, which is the main reason for creeping discharge. The preventive measures are summarized for the creeping discharge fault of the basin-type insulator to avoid the occurrence of similar accidents.
Highlights
The surface discharge of basin-type insulators is a high-frequency fault of combined electrical appliances[5]. It is of far-reaching significance to study the problems of basin-type insulator flashover, internal electric field distortion of GIS, and partial discharge[6-7]
Literature [8] conducted an electric field simulation analysis on the partial discharge or flashover caused by bubbles inside the basin insulator
Preliminary analysis is based on the premise that the insulation margin of the GIS gas chamber design is relatively low, and due to the operating over voltage caused by the bus tie switch closing, the transition conductor structure of the wide and narrow barrel diameter and the voltage equalization base of the conductor root The phase-to-phase aggravated the distortion of the electric field, and caused the surface discharge phenomenon on the surface of the failed basin insulator, which eventually led to the occurrence of the failure
Summary
Gas-insulated metal-enclosed switchgear, reabbreviated as GIS, is a fully enclosed combined electrical appliance, which encapsulates equipment such as busbars, circuit breakers, isolation/grounding switches, transformers, and arresters in a grounded metal shell to form a whole device [1-2]. The surface discharge of basin-type insulators is a high-frequency fault of combined electrical appliances[5]. It is of far-reaching significance to study the problems of basin-type insulator flashover, internal electric field distortion of GIS, and partial discharge[6-7]. Literature [8] conducted an electric field simulation analysis on the partial discharge or flashover caused by bubbles inside the basin insulator. This paper will start with the power generation fault along the surface of a substation GIS basin insulator, analyze the cause of the fault, and establish a calculation model to simulate and analyze the surface field strength of the basin insulator, verify the cause of the fault, and conduct modeling and simulation of the model insulator to verify the correctness of the analysis. Put forward effective measures to avoid the recurrence of this type of problem in the expansion project
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