单芯电缆金属屏蔽层谐波过电压抑制技术研究  

Research on harmonic overvoltage suppression technology in metal shielding layer of single-core cable

作　　者：陈涛[1] 武守远 朱珂[1] 庞怀江[2] 鲁南[2] CHEN Tao;WU Shouyuan;ZHU Ke;PANG Huaijiang;LU Nan(Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education,Shandong University,Jinan 250061,China;Laiwu Steel Corporation,Jinan 250061,China)

机构地区：[1]电网智能化调度与控制教育部重点实验室(山东大学),山东济南250061 [2]莱芜钢铁集团有限公司,山东济南250061

出　　处：《电气应用》2020年第9期55-63,共9页Electrotechnical Application

摘　　要：传统单芯电缆屏蔽层保护器只能抑制雷电和故障过电压,无法解决谐波引起的屏蔽层感应过电压和谐振过电压问题。为此提出了一种单芯电缆屏蔽层泄放阻尼技术,首先通过分析屏蔽层感应电压的产生机理,建立了单芯电缆屏蔽层耦合模型;然后在模型的基础上研究了谐波引起的感应过电压和谐振过电压问题,进而提出了将电缆屏蔽层经泄放电容和阻尼电阻的串联回路接地来降低谐波引起的过电压的技术方案;最后给出了泄放电容和阻尼电阻参数的选择方法。理论和仿真分析都验证了该技术的有效性。Traditional shielding layer protector of single-core cable can only suppress lightning and fault overvoltage,and can not solve the induced overvoltage and resonance overvoltage caused by harmonics.A discharge damping technology for shielding layer of single-core cable is proposed.Firstly,the coupling model of shielding layer is established by analyzing the mechanism of shielding layer induced voltage;then,the induced overvoltage and resonance overvoltage caused by harmonics are studied based on the model;furthermore,a technical scheme of reducing the overvoltage caused by harmonics by grounding the cable shielding layer through discharge capacitance and damping resistance in series is proposed;finally,the method of choosing parameters of discharge capacitance and damping resistance is given.Theoretical results,simulated analysis confirm effectiveness of this method.

关 键 词：电缆 屏蔽层 感应电压 谐振 泄放阻尼技术 

分 类 号：TM75[电气工程—电力系统及自动化]