基于UHV-FTRTPS的特高压交流变压器局部放电试验技术

发布时间：2018-08-27 10:11

【摘要】：我国特高压交流变压器局部放电试验的电源大多采用中频发电机组,具有配套装置多、笨重不便操作等缺点。为此,提出了一种基于调频式谐振特高压试验电源(UHV-FTRTPS)的特高压交流变压器局部放电试验方法。该方法试验电源的功率放大器件主要为模拟功率放大器,通过计算与分析高压补偿电抗器的损耗、试验电路的附加损耗、被试特高压交流变压器空载损耗、中间升压励磁变压器损耗得出试验电源的总容量,并以减少试验回路总损耗为目标,确定了试验电源输出电压信号的频率调节范围;同时依据被测试特高压交流变压器现场加压时间和步骤,提出了中间励磁升压变压器台数及档位的2种选择方式;针对试验过程中试验电源输出电压信号中出现的自激振荡干扰和电磁干扰,提出了增加信号屏蔽措施和RC输出滤波器的解决方法。依据理论分析和计算得出了试验电源的总容量≥600 k W,确定了试验电源输出电压信号的频率调节范围为140~155 Hz。现场试验结果表明,被测试特高压交流变压器的局部放电量≤500 p C,验证了提出的局部特高压交流变器局部放电试验方案的正确性、有效性。
[Abstract]:In our country, UHV AC transformer partial discharge test power supply mostly adopts intermediate frequency generator set, has many auxiliary devices, heavy and inconvenient operation and other shortcomings. This paper presents a partial discharge test method for UHV AC transformers based on FM resonant UHV test power supply (UHV-FTRTPS). The power amplifier of the test power supply is mainly analog power amplifier. By calculating and analyzing the loss of high voltage compensating reactor, the additional loss of test circuit, the no-load loss of UHV AC transformer tested, The total capacity of the test power supply is obtained by the loss of the intermediate boost excitation transformer, and the frequency regulation range of the output voltage signal of the test power supply is determined in order to reduce the total loss of the test circuit. At the same time according to the test UHV AC transformer field pressurization time and step proposed the intermediate excitation booster transformer number and the gear choice two ways; In view of the self-excited oscillation interference and electromagnetic interference in the output voltage signal of the test power supply, the methods of increasing signal shielding and RC output filter are put forward. According to the theoretical analysis and calculation, the total capacity of the test power supply is more than 600kW, and the frequency regulation range of the output voltage signal of the test power supply is determined to be 140 ~ 155 Hz.. The field test results show that the partial discharge of UHV AC transformer tested is less than 500p C, which verifies the correctness and validity of the proposed partial discharge test scheme for UHV AC transformer.
【作者单位】：湖南大学现代工程训练中心;国网湖南省电力公司电力科学研究院;
【基金】：国家自然科学基金(51507057)~~
【分类号】：TM855

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