刘秀雄 黎玉庭 段玉杰 黄梁英



摘要:初步探索并联补偿+串联谐振技术在交流耐压中的应用。
应用我们在日常电气试验中最常用的工频交流耐压方式,在大电容试品上并联上补偿电抗器,通过调节补偿电抗器的值,使电路中的容抗值稍大于感抗值,等效于一个小容抗值的试品,然后再用串联变频谐振方式进行升压,试验电源和试验设备在容量很小的状况下就能输入较高的交流电压,从而完成对高压及大电容试品的交流耐压试验。
关键词:大电容试品,容抗,感抗,并联补偿,串联谐振
Discussion on Applications of Parallel Compensation Resonance and Series Resonance in AC Withstand Voltage
LIU Xiu-xiong, LI Yu-ting, DUAN Yu-jie,HUANG LiangYing
(Liuzhou Power Supply Bureau, Guangxi Power Grid Co., Ltd., Liuzhou 545005, China)
Abstract: The application of parallel compensation resonance and series resonance
was studied. We show that after connecting the compensation reactor in parallel to the large capacitance test product using AC withstand voltage, by adjusting the value of the compensation reactor and making the capacitive reactance value in the circuit slightly exceed the inductive reactance value, the large capacitance test product can be viewed as a device with a small capacitive reactance value. By using this method, higher AC voltage can be inputted under small capacity of test power supply and field equipment while using the series frequency conversion resonance method to boost voltage, which enables the AC voltage test for the high voltage and large capacitance to be successfully conducted.
Keywords: Large capacitance test sample, Capacitive reactance, Inductive reactance, Parallel compensation, Series resonance
0引言
在上世纪九十年代中期以后,国际上对于以交联聚乙烯为绝缘介质的中高压电力电缆,其主绝缘的耐压试验都要求进行交流耐压试验;由于电缆定义为容性试品,试验电压采用工频按原理上是不可能在作业现场完成的工作,因此,在施工作业现场的采用变频谐振的方式进行,目前国际上采用的“串联变频谐振交流耐压试验”设备,都是由变频电源、励磁变压器、电抗器、电容分压器四大部分组成,每一部分的特点都是重量重、体积大;根据被试品的电容量不同,每一部分的接线又有变化,整体接线也十分的复杂,同时为保证人员、设备及被试品安全,在试验前根据被试品情况进行计算及验算,要编写复杂的使用方案,在试验过程中,操作复杂,变数较多,一般频率在30~300Hz之间。
1目的和意义
电力电缆在国内以迅猛的势头在发展,电力电缆的绝……