面向油浸式变压器类绕组暂态电压测量的耦合电容传感器优化设计

发布时间：2019-04-09 09:10

【摘要】：变压器类绕组暂态电位分布研究对绕组类设备的绝缘设计具有重要意义。根据浸油状态下变压器类绕组暂态电压非接触式测量的实际工程要求,对耦合电容传感器的结构及尺寸进行了优化设计。获取了电容传感器与不同信号处理电路组合时的高、低频响应特性,验证了优化后耦合电容传感器在合理选择信号处理电路的情况下具有良好的高、低频响应特性,可用于双指数波(中低频暂态电压)及高频暂态电压(very fast transient overvoltage,VFTO)的测量。实验研究了测量电缆长度对传感器输出信号的影响。结果表明,增加测量电缆长度会在增大传感器分压比的同时降低上、下限截止频率,故在实验中应尽可能采用较短的电缆来提高测量准确性。
[Abstract]:The study of the transient potential distribution of the transformer winding is of great significance to the insulation design of the winding equipment. According to the actual engineering requirement of the non-contact measurement of the transient voltage of the transformer winding under the condition of oil immersion, the structure and the size of the coupled capacitance sensor are optimized. the high and low frequency response characteristics of the capacitance sensor and the different signal processing circuits are obtained, the optimized coupling capacitance sensor has good high and low frequency response characteristics under the condition that the signal processing circuit is reasonably selected, It can be used for measurement of high-frequency transient voltage and high-frequency transient voltage (VFTO). The influence of the length of the cable on the output signal of the sensor is studied. The results show that the increase of the length of the measuring cable can decrease the upper and lower cut-off frequencies while increasing the partial pressure ratio of the sensor, so that the shorter cable can be used to improve the measurement accuracy in the experiment.
【作者单位】：电力设备电气绝缘国家重点实验室(西安交通大学);山东电力设备有限公司;国网山东省枣庄供电公司;
【基金】：国家电网公司科技项目(SGSD0000JSJS1600027)~~
【分类号】：TM411;TP212

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