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.
作者
陈涛
武守远
朱珂
庞怀江
鲁南
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)
出处
《电气应用》
2020年第9期55-63,共9页
Electrotechnical Application
关键词
电缆
屏蔽层
感应电压
谐振
泄放阻尼技术
cable
shielding layer
induced voltage
resonance
discharge damping technology
