直流叠加冲击电压下PEA法空间电荷测量系统的研制  

Preparation of PEA Method Space Charge Measurement System Under DC Voltage Superimposed Impulse Voltage

作　　者：崔伯男 刘帅 姜泉旭 王霞[1] CUI Bonan;LIU Shuai;JIANG Quanxu;WANG Xia(State Key Laboratory of Electrical Insulation and Power Equipment,Xi′an Jiaotong University,Xi′an 710115,China;State Grid Dalian Power Supply Company,Dalian 116000,China)

机构地区：[1]西安交通大学电力设备电气绝缘国家重点实验室,陕西西安710115 [2]国网大连供电公司,辽宁大连116000

出　　处：《绝缘材料》2022年第8期104-112,共9页Insulating Materials

基　　金：国家自然科学基金资助项目(52077171)。

摘　　要：在直流输电线路中,电缆线路易受到操作过电压与雷电过电压的侵扰,导致线路在直流电压的基础上叠加冲击电压,使绝缘层空间电荷积聚发生变化。为了研究冲击电压叠加对直流电缆线路运行中电荷积聚的影响,本文在传统的电声脉冲法上进行改进,结合等效电路进行公式推导与Pspice仿真,合理选取测量系统中阻容元件的参数取值,研制了一套直流叠加冲击电压下PEA法空间电荷测量系统,并测量了XLPE试样在直流叠加冲击电压下的空间电荷特性。结果表明:试样受到的冲击电压与直流电压均达到了极高的耦合效率,空间电荷特性表明叠加同极性冲击电压比异极性冲击电压更能够促进同极性电荷的注入和迁移。In DC transmission lines, cable line is easy subjected to the impact of operating overvoltage and lightning overvoltage, which leads to cable line superimposed by impulse voltage on the basis of DC voltage,making the space charge accumulation on insulation layer change. In order to study the effect of impulse voltage superposition on the charge accumulation in the operating DC cable lines, a PEA method space charge measurement system under DC superimposed impulse voltage was developed through improvement on the traditional PEA method, combining with equivalent circuit formula deduction and Pspice software simulation, and reasonable selection of RC-component in measurement system. The space charge characteristics of XLPE samples under DC superimposed impulse voltage were measured. The results show that the coupling efficiency of impulse voltage and DC voltage is very high, and the space charge characteristics show that the superimposing the same polarity of impulse voltage can promote the injection and migration of the same polarity charge more compared with superimposing different polarity of impulse voltage.

关 键 词：电声脉冲法 空间电荷 耦合效率 直流叠加冲击电压 XLPE 

分 类 号：TM215[一般工业技术—材料科学与工程] TM835[电气工程—电工理论与新技术]