在长距离超高压电缆线路交接验收试验时,将高频电流线圈(high-frequency current transformer,HFCT)安装在交叉互联箱和直接接地箱内的引线末端以检测局部放电信号(明确局部放电信号的传播对于合理布置HFCT十分重要)。对引线电缆与输电...在长距离超高压电缆线路交接验收试验时,将高频电流线圈(high-frequency current transformer,HFCT)安装在交叉互联箱和直接接地箱内的引线末端以检测局部放电信号(明确局部放电信号的传播对于合理布置HFCT十分重要)。对引线电缆与输电电缆金属屏蔽层不同连接方式下局部放电的传播过程进行仿真,使用电缆模域理论将相域下的各导体局部放电信号分解为模域下的同轴模信号和土壤返回模信号,获得了不同连接方式下局部放电信号在线芯、屏蔽层及模域回路中的传播和衰减特性。仿真结果表明:在接头引线上HFCT测量得到的局部放电信号主要是同轴模信号;直通接头引线上流过的局部放电信号比较弱,应优先将HFCT布置在绝缘接头引线的末端。展开更多
The purpose of this paper is to investigate the effect of PD （partial discharge） activity within medium voltage XLPE （cross-linked polyethylene） cables. The effect of partial discharge was studied by means of a nu...The purpose of this paper is to investigate the effect of PD （partial discharge） activity within medium voltage XLPE （cross-linked polyethylene） cables. The effect of partial discharge was studied by means of a number of simulations. The simulations were based on the well-known three capacitor model for partial discharge. An equivalent circuit was derived for partial discharge due to a single void in the insulation material of a power cable. The results obtained from the simulations will form the basis of the design proses of a non-intrusive condition monitoring technique. The technique is based on the classification of discharge activity according to five levels of PD. Future work will include the improvement of the simulation model by investigating the high frequency model of a power cable as well as the statistical nature of PD activity. This will improve the accuracy of the simulation results when compared to actual measurements. The work discussed in this paper will be used to construct and calibrate a practical model which will make use of PD measurements for non-intrusive condition monitoring of medium voltage electrical cables.展开更多
文摘在长距离超高压电缆线路交接验收试验时,将高频电流线圈(high-frequency current transformer,HFCT)安装在交叉互联箱和直接接地箱内的引线末端以检测局部放电信号(明确局部放电信号的传播对于合理布置HFCT十分重要)。对引线电缆与输电电缆金属屏蔽层不同连接方式下局部放电的传播过程进行仿真,使用电缆模域理论将相域下的各导体局部放电信号分解为模域下的同轴模信号和土壤返回模信号,获得了不同连接方式下局部放电信号在线芯、屏蔽层及模域回路中的传播和衰减特性。仿真结果表明:在接头引线上HFCT测量得到的局部放电信号主要是同轴模信号;直通接头引线上流过的局部放电信号比较弱,应优先将HFCT布置在绝缘接头引线的末端。
文摘The purpose of this paper is to investigate the effect of PD （partial discharge） activity within medium voltage XLPE （cross-linked polyethylene） cables. The effect of partial discharge was studied by means of a number of simulations. The simulations were based on the well-known three capacitor model for partial discharge. An equivalent circuit was derived for partial discharge due to a single void in the insulation material of a power cable. The results obtained from the simulations will form the basis of the design proses of a non-intrusive condition monitoring technique. The technique is based on the classification of discharge activity according to five levels of PD. Future work will include the improvement of the simulation model by investigating the high frequency model of a power cable as well as the statistical nature of PD activity. This will improve the accuracy of the simulation results when compared to actual measurements. The work discussed in this paper will be used to construct and calibrate a practical model which will make use of PD measurements for non-intrusive condition monitoring of medium voltage electrical cables.
