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Abstract
In this paper, the amount of SF6 decomposition gases due to the partial discharge (PD) was studied in the SF6 gas-insulated transformer. The long-term PD degradation experiment was performed while controlling the discharge magnitude using the surface discharge, and the gas generation amount was measured by using gas chromatography for SO2F2, SOF2, SO2, CO, and CF4. In addition, to investigate the relationship between the partial discharge energy and the decomposed gas generation amount, partial discharge energy was calculated by a data processing program and converted to the unit of joule per mole. With the finite element method (FEM), the electric field distribution and SF6 gas decomposition mechanism were explained for the partial discharge energy effect on the gas generation. This study helps understand the relationship between the partial discharge energy and the decomposed gas generation ratio with the experimental results and can be used for the diagnosis of PD and maintenance process for the gas-insulated transformers.
Highlights
SF6 gas has been used broadly for different types of power apparatus due to its excellent insulation ability since the start of gas circuit breakers in 1930s
Gas we focused on the effect of the partial variation on the2Famount of2. decomposed generation, and effecttried of thetopartial magnitude variation on the amount of and decomposed gas generation, and further revealdischarge the relationship between the discharge energy the mechanism for generating further tried togases
SO2F2, SOF2, and SO2 were adopted as the feature gases and measured using the gas chromatography (GC)
Summary
SF6 gas has been used broadly for different types of power apparatus due to its excellent insulation ability since the start of gas circuit breakers in 1930s. The degradation characteristics of insulating materials have been applied to the GIT by the thermal degradation and the partial discharge degradation In this case, the gas generation mechanism should be identified. For the stable operation of GIT, establishing the gas diagnosis standard and the maintenance procedure are urgently required in the engineering field For this reason, it is necessary to grasp the decomposed gas generation characteristics by overheating and partial discharge defects through long-term overheating and discharge degradation experiments. Some papers have investigated the defect classification method by analyzing the composition ratio of decomposed gases [9] It has limits in the suggestion of generalized diagnostic criteria due to the non-standard shape of discharge structures and a fixed applied voltage for each defect model. The featuring gas generated by the long-term partial discharge degradation experiments of the GIT was extracted and the gas generation rate according to the partial discharge energy was analyzed for establishing the diagnostic standards and maintenance procedures
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