振荡波电压作用下的电缆介质损耗测量方法

介质损耗是评价电力电缆绝缘状态的重要指标之一。振荡波电压作为目前新兴的检测电压,因具有与工频交流电压较好的等效性,在局部放电检测领域有广泛的应用,但振荡波电压下的介质损耗测量工作暂未深入开展,对绝缘状态一体化检测具有局限性。为了解决目前的局限性,文中提出了一种基于振荡波测试技术的电缆介质损耗测量方法。在振荡波测试系统每次工作期间,采集电缆试品的电压或电压、电流数据,然后通过数据后处理提取波形参数,从而获得准确的介质损耗。文中同时对2种基于振荡波电压的介质损耗测量方法进行对比与现场误差分析,得到基于振荡波电压、电流波形的介质损耗角测量方法,具有较高的准确性以及实用性,并提出了解决零点漂移的方法。最后,仿真以及实验结果验证了该方法的可行性和有效性。

Cable dielectric loss measurement based on oscillating wave voltage

Dielectric loss is one of the important indexes to evaluate the insulation state of power cables. As the current emerging detection voltage, the oscillating wave voltage has a good equivalence with the power frequency AC voltage, and has a wide range of applications in the field of partial discharge detection. However, the dielectric loss measurement has not been carried out in depth, which has limitations for the integrated detection of insulation status. In order to solve the problem of current limitations, a cable dielectric loss measurement method based on the oscillating wave test technology is proposed. During each operation of the oscillating wave test system, the voltage or voltage-current data of the cable sample are collected, and then the waveform parametersare extracted through data post-processing to obtain accurate dielectric loss. At the same time, the two measurement methods are compared and the field error is analyzed, and the dielectric loss angle measurement method based on the oscillating wave voltage and current waveform has high accuracy and practicability, and a method to solve the problem of zero drift is proposed. Finally, simulation and experimental results verify the feasibility and effectiveness of the method.