高压电器2024，Vol.60Issue(5)：156-163,8.DOI:10.13296/j.1001-1609.hva.2024.05.020
计及电缆绝缘不均匀老化的接地电流相位角特性研究
Study on Phase Angle Characteristics of Grounding Current Considering Uneven Aging of Cable Insulation
摘要
Abstract
Cross linked polyethylene(XLPE)power cable is widely used in transmission and distribution network and,however,suffers from long-term aging degradation under continuous electrical stress,and cable aging can eas-ily cause insulation breakdown.In order to improve the online assessment technology of cable insulation aging sta-tus,a three-core tube-type cable grounding current phase angle calculation model considering uneven aging of cable insulation is set up based on PSCAD.The phase angle characteristics of such three types of the grounding wire cur-rent as single-phase uneven aging,two-phase uneven aging and three-phase uniform aging are obtained through FFT variation.The result shows that compared to the current of steel armored grounding wires,the response of phase an-gle of shielding wire current to the aging characteristics is more sensitive.For the single-phase aging,the dielectric constant increases from 2 to 5,and the phase angle of the shielding wire current increases from-51.01°to-50.6°.For the two-phase aging,the amplitude of phase angle gradually increases with the increase of degree of aging;For the three-phase uniform aging,the phase angle increment of the shielding wire current is 0.24°compared to normal cables and,at the same time,the phase angle increment of the shielding wire current is maximum compared to sin-gle-phase aging and two-phase aging with the same dielectric constant of 2.8(0.15°for single-phase aging and 0.17° for two-phase aging).The analysis of the phase amplitude of the shielded wire current can not only judge the aging status of the cable insulation,but also distinguish the aging phase and degree.The research results in this paper can provide important theoretical basis for assessing the insulation aging level of cables through the phase angle of grounding wire current.关键词
三芯电缆/绝缘老化/介电常数/接地电流相位角Key words
three core cable/insulation aging/dielectric constant/phase angle of grounding current引用本文复制引用
刘刚,王秀茹,邱冬,王德,鲍诗杰,张东东..计及电缆绝缘不均匀老化的接地电流相位角特性研究[J].高压电器,2024,60(5):156-163,8.基金项目
国网江苏省电力公司科技项目(J2023101) （J2023101）
中国博士后科学基金资助项目(2023M732412). Project Supported by Science Foundation of State Grid Jiangsu Electric Power Company(J2023101),Project Funded by China Postdoctoral Science Foundation(2023M732412). （2023M732412）
