过零点时差法测量介质损耗的误差分析

文章介绍了电气设备绝缘介质损耗过零点时差法的测量原理和介损测量中的信号提取技术，给出基于过零点时差法的测量系统框图。详细分析了采用这个测量系统时，电路元件零点漂移以及电网谐波带来的测量误差，并提出了相应的减少误差的措施。利用基于文章讨论的原理及方法设计的绝缘介质损耗测量仪对试品进行了测量，并给出了试验结果。

Analysis of Dielectric Loss Measurement Errors by Ways of Pass Zero Distinguishing Phase

The principles of the measuring method of dielectric loss of power equipment by pass zero distinguishing phase and technique of picking-up signals in measuring dielectric loss are presented.The system diagram based on the method of passing zero distinguishing phase is given.The measurement errors brought by crossing zero excursion of circuit components and harmonics wave of power net when using this measuring system are analyzed.The correspondent measures to reduce measuring errors are recommended.The dielectric loss measuring equipment based on the principle and methods is used to measure the samples.The experiment result is given.