Temperature is an important environmental factor during the operation of gas-insulated switchgear (GIS), affecting the evaluation results of the GIS equipment to increase the risk of the power system. However, the influence of temperature on the partial discharge detection signal of GIS is still unclear. Aimed at the common void defects in GIS, the law of change on the number of ultrahigh-frequency (UHF) pulses, the UHF amplitude, the characteristic value of the UHF map, and the maximum apparent charge of a single pulse with temperature are obtained using the UHF method and IEC60270, and corresponding theoretical analysis is carried out. The results show that an increase in temperature leads to a decrease in the void discharge delay time, causing an increase in UHF pulses and a decrease in the apparent charge of a single discharge pulse in the experiment. The increase of temperature makes the void discharge current rise quickly so that the induced UHF amplitude increases. In the range of 40–70°C, the maximum pulse amplitude increases by approximately 30% for every 10°C increase, and the average pulse amplitude increases by approximately 12%. The result of UHF signals affected by temperature obtained in this study has research significance for the realisation of a comprehensive evaluation of the insulation state of GIS equipment considering temperature.

中文翻译：

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温度对GIS空洞缺陷放电信号影响的实验研究

温度是气体绝缘开关设备（GIS）运行过程中的重要环境因素，影响GIS设备的评价结果​​，增加电力系统的风险。但温度对GIS局部放电检测信号的影响尚不清楚。针对GIS中常见的空洞缺陷，得到了超高频（UHF）脉冲个数、UHF幅值、UHF图特征值、单脉冲最大表观电荷随温度的变化规律。采用UHF方法和IEC60270，并进行了相应的理论分析。结果表明，温度升高导致空洞放电延迟时间减少，导致实验中 UHF 脉冲的增加和单个放电脉冲的表观电荷减少。温度的升高使空洞放电电流迅速上升，从而使感应超高频幅值增大。在40~70°C范围内，每升高10°C，最大脉冲幅度增加约30%，平均脉冲幅度增加约12%。本研究得到的UHF信号受温度影响的结果对于实现考虑温度的GIS设备绝缘状态的综合评价具有研究意义。每升高 10°C，最大脉冲幅度增加约 30%，平均脉冲幅度增加约 12%。本研究得到的UHF信号受温度影响的结果对于实现考虑温度的GIS设备绝缘状态的综合评价具有研究意义。每升高 10°C，最大脉冲幅度增加约 30%，平均脉冲幅度增加约 12%。本研究得到的UHF信号受温度影响的结果对于实现考虑温度的GIS设备绝缘状态的综合评价具有研究意义。