PP电树枝起始电压测试方法及电压稳定剂作用效果研究  

Electrical Tree Initiation Voltage Test Method of Polypropylene and Effects of Voltage Stabilizers

作　　者：孟飞 邵满智 牛越 万玉鑫 李春阳[1] 赵洪[1] MENG Fei;SHAO Manzhi;NIU Yue;WAN Yuxin;LI Chunyang;ZHAO Hong(Key Laboratory of Engineering Dielectrics and Its Application,Ministry of Education,Harbin University of Science and Technology,Harbin 150080,China;Harbin Power Supply Company,State Grid Heilongjiang Electric Power Co.,Ltd.,Harbin 150000,China;Chifeng Power Supply Company,State Grid Inner Mongolia Eastern Electric Power Co.,Ltd.,Chifeng 024000,China)

机构地区：[1]哈尔滨理工大学工程电介质及其应用技术教育部重点实验室,黑龙江哈尔滨150080 [2]国网黑龙江省电力有限公司哈尔滨供电公司,黑龙江哈尔滨150000 [3]国网内蒙古东部电力有限公司赤峰供电公司,内蒙古赤峰024000

出　　处：《绝缘材料》2022年第7期41-49,共9页Insulating Materials

基　　金：国家自然科学基金资助项目(U20A200815)。

摘　　要：针对透明度较低的共聚聚丙烯(PP)材料,设计制作了基于高频电流传感器(HFCT)的电树枝起始电压测试系统,通过实验确定该测试系统能检测到最小为5 pC的局部放电信号,测试灵敏度较高,并通过局部放电信号的辨识试验发现电树枝引发时的放电主频谱在12.9 MHz左右,与测试系统中其他可能会产生影响的局部放电频谱均不同,可以证明测得的具有特定频谱特征的局部放电信号是由试样电树枝引发导致的。利用透明XLPE试样进行了试验验证,发现该测试系统与电树枝显微观测系统测得的电树枝起始电压几乎相同,证明了该基于HFCT的电树枝起始电压测试系统的可靠性。然后分别探究了AOHBP、RBBT、RQCT 3种芳香酮电压稳定剂对共聚PP绝缘材料交流电树枝起始电压的影响。结果表明:3种电压稳定剂在适当添加量下均能提高PP电树枝引发过程的局部放电起始电压与熄灭电压,最优组分分别为PP+0.6份AOHBP、PP+0.4份RBBT、PP+0.6份RQCT,其中PP+0.6份AOHBP抑制电树枝引发的效果最好,使得电树枝起始电压提高了33.0%。Aiming to the copolymerized polypropylene(PP)material with low transparency,an electrical tree initiation voltage test system based on high frequency current sensor(HFCT)was designed.It was confirmed that the test system could detect partial discharge signal as low as 5 pC,and the test sensitivity was higher.Through the identification test of partial discharge signal,it was found that the main spectra of discharge caused by electrical tree initiation located at 12.9 MHz,which were different from the other disruptive partial discharge signals probably generated in test system.It was proved that the obtained partial discharge signal with a specific frequency characteristic was caused by the electrical tree initiation of sample.The transparent XLPE sample was conducted verification experiment,it was found that the electrical tree initiation voltage measured by the test system was almost the same as that measured by microscopic observation system,which confirmed the practicability of the electrical tree initiation voltage test system based on HFCT.Then,the effects of three voltage stabilizers of AOHBP,RBBT,and RQCT on the AC electrical tree initiation voltage of copolymerized PP material were investigated,respectively.The results show that three kinds of voltage stabilizers can all increase the initiation voltage and quenching voltage of partial discharge in the process of electrical tree initiation of PP with appropriate addition amounts.The optimal components are PP+0.6 phr AOHBP,PP+0.4 phr RBBT,and PP+0.6 phr RQCT,respectively.Among them,PP+0.6 phr AOHBP has the best inhibiting effect of electrical tree initiation,making the initial voltage of electrical tree increase by 33.0%.

关 键 词：共聚聚丙烯 电压稳定剂 高频电流传感器 局部放电 电树枝 

分 类 号：TM215[一般工业技术—材料科学与工程]