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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。
Research on the Transient Potential Distribution of Transformer Windings is of great significance to the insulation design of winding equipment. According to the actual engineering requirements of non-contact measurement of transient voltage of winding in oil immersed state, the structure and size of the coupled capacitive sensor are optimized. The high-frequency and low-frequency response characteristics of capacitance sensor and different signal processing circuits are obtained. The optimized coupling capacitance sensor is verified to have good high-frequency and low-frequency response when the signal processing circuit is selected reasonably. It can be used in double exponential wave Low-frequency transient voltage) and high-frequency transient voltage (very fast transient overvoltage (VFTO) measurements. The effect of measuring the cable length on the sensor output signal was experimentally investigated. The results show that increasing the measuring cable length will increase the partial pressure ratio of the sensor and lower the upper and lower cut-off frequencies. Therefore, shorter cables should be used in the experiment to improve the measuring accuracy.