特高压变压器典型分区绝缘结构线圈内匝间电压振荡特性

发布时间：2018-04-28 22:25

本文选题：电力变压器 + 特快速暂态过电压　；参考：《高电压技术》2014年12期

【摘要】：为应对快速暂态电压侵入变压器线圈后可能激起的电压振荡,以内屏连续式和纠结连续式2种典型结构的高压线圈为对象,研究了变压器线圈固有频率的响应因子、固有频率的振荡模式、固有频率正弦电压和典型快速暂态过电压(VFTO)激励下线圈内匝间电压的分布规律。结果表明:变压器线圈内激起明显电压振荡的频率一般10 MHz,内屏连续式线圈最大响应因子略大于纠结连续式线圈,且较大响应因子的频率分布要更分散;在固有频率正弦电压激励下,低频振荡模式表现出对较大范围的节点电压有明显贡献,而高频振荡模式表现出只对线圈首端少数节点电压有明显贡献,高频振荡模式比低频振荡模式在线圈首端部位有更大的电压梯度,从而可能产生更大的匝间电压。综合比较2种线圈的振荡模式发现,从总体来看,纠结连续式出现最大匝间电压略小于内屏连续式,前者出现较大匝间电压的范围略小于后者。
[Abstract]:In order to deal with the voltage oscillation caused by the fast transient voltage intruding into the transformer coil, the response factor of the natural frequency of the transformer coil is studied by taking two typical high-voltage coils with the inner screen continuous type and the intertwined continuous type as the object. The distribution of inter-turn voltage in the coil excited by the oscillation mode of the natural frequency, the sinusoidal voltage of the natural frequency and the typical fast transient overvoltage VFTO. The results show that the frequency of obvious voltage oscillation in transformer coil is generally 10 MHz, the maximum response factor of inner screen continuous coil is slightly larger than that of tangled continuous coil, and the frequency distribution of larger response factor is more dispersed. Under the excitation of natural frequency sinusoidal voltage, the low frequency oscillation mode has obvious contribution to a wide range of node voltages, while the high frequency oscillation mode only contributes to a few node voltages at the first end of the coil. The high frequency oscillation mode has a larger voltage gradient at the first end of the coil than the low frequency oscillation mode, which may result in a larger inter-turn voltage. By comparing the oscillation modes of the two coils, it is found that, in general, the maximum inter-turn voltage of the tangled continuous type is slightly smaller than that of the inner screen continuous type, and the range of the larger inter-turn voltage in the former is slightly smaller than that of the latter.
【作者单位】：清华大学电机工程与应用电子技术系电力系统及发电设备安全控制和仿真国家重点实验室;
【基金】：国家自然科学基金(51077084)~~
【分类号】：TM403.3

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