10 kV与110 kV电缆线路混合敷设对环流影响研究
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摘要
近年来,随着城市不同等级地下多回路电缆线路敷设的增多,其多回路造成的电缆金属护套环流损耗问题也趋于严重。基于电磁感应原理,计算了10、110 kV单芯电缆线路金属护套交叉互联时护套感应电压,并通过建立电缆线路阻抗模型推导环流矩阵方程,获得了不同电压等级线路中金属护套环流及相互影响。结果表明,混合敷设会造成10 kV线路环流增加和110 kV线路环流的减小;10、110 kV线路相间距增大会增加自身环流但相互影响却不同,110 kV线路相间距增大200 mm,10 kV线路环流增加48.99%,10 kV线路相间距增大200 mm,110 kV线路环流几乎不会发生变化;10、110 kV线路交叉互联单元内三段电缆段长改变会影响自身环流,但不会影响临近线路;负载电流增加均会极大影响环流;不同电压等级回路垂直距离越大,环流越小;环流最大相序组合为BAC-CAB(10～110 kV),最小环流相序为CBA-ACB(10～110 kV)。以上分析结果对电缆线路规划和设计提供了理论支持和数据支撑。
In recent years, more and more multi-circuit cable lines of different voltage levels are laid underground of the cities, multi-circuit can cause the problems of circulation loss on cable metal sheath become severe, the different voltage levels of the cable lines are mixed laid, which have a greater impact on circulating current. Based on the principle of electromagnetic induction, calculating the induced voltage of 10, 110 kV single core cables in this paper, both of sheaths with applied cross-bonding connection. Circulating current matrix equation is figured out by the impedance model, and finally get the result of circulating current on the metal sheath of different voltage cable lines and the interdependent of each other. The results show that mixed-laying will lead the 10,110 kV line circulating current increase and decrease; 10, 110 kV line's circulating current will increase with the increasing of space between different phases, but interaction between them is different,10 kV line circulating current increased by 48.99% when 110 kV line phase spacing increased 200 mm,10 kV line phase spacing increased 200 mm, the 110 kV line circulating current almost did not change; the arrange of three segments length of cable on cross-bonding unit will affect their own circulating current, but does not impact the circuit which next to; the varies of load current influence circulating current greatly; The greater the vertical distance between the 10,110 kV line, the smaller the circulating current is; the circulating current is the largest as the phase sequence is BAC-CAB(10～110 kV), the smallest circulating current appears when the phase sequence is CBA-ACB(10～110 kV). The results above will have good reference for cable route planning and design.
In recent years, more and more multi-circuit cable lines of different voltage levels are laid underground of the cities, multi-circuit can cause the problems of circulation loss on cable metal sheath become severe, the different voltage levels of the cable lines are mixed laid, which have a greater impact on circulating current. Based on the principle of electromagnetic induction, calculating the induced voltage of 10, 110 kV single core cables in this paper, both of sheaths with applied cross-bonding connection. Circulating current matrix equation is figured out by the impedance model, and finally get the result of circulating current on the metal sheath of different voltage cable lines and the interdependent of each other. The results show that mixed-laying will lead the 10,110 kV line circulating current increase and decrease; 10, 110 kV line's circulating current will increase with the increasing of space between different phases, but interaction between them is different,10 kV line circulating current increased by 48.99% when 110 kV line phase spacing increased 200 mm,10 kV line phase spacing increased 200 mm, the 110 kV line circulating current almost did not change; the arrange of three segments length of cable on cross-bonding unit will affect their own circulating current, but does not impact the circuit which next to; the varies of load current influence circulating current greatly; The greater the vertical distance between the 10,110 kV line, the smaller the circulating current is; the circulating current is the largest as the phase sequence is BAC-CAB(10～110 kV), the smallest circulating current appears when the phase sequence is CBA-ACB(10～110 kV). The results above will have good reference for cable route planning and design.
引文
[1] CZAPP S, DOBRZYNSKI K, KLUCZNIK J, et al.Computer-aided analysis of induced sheath voltages in high voltage power cable system[C].IEEE the 10th International Conference on Digital Technologies, 2014.
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[9] 邓星,蒙绍新,尹项根,等. 多回并联电缆线路参数的不对称性分析[J]. 高电压技术,2010, 36(12): 3119-3124.
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[11] 方雷,李勇,王耀辉. LG水电站500 kV交联聚乙烯绝缘电力电缆金属护套感应电压计算[C].电气学术交流会议, 2013.
[12] 罗俊华,张丽,刘毅刚,等. 超高压大截面电力电缆线路热膨胀计算分析[J]. 高电压技术,2010, 36(5): 1281-1286.
[13] 樊友兵,赵健康,钱康,等. 单芯电力电缆同相多根并联运行方式分析与优化[J]. 高电压技术,2010, 36(10): 2607-2612.
[14] 赵作斌,张克杰. 长距离不同电压等级电缆降压混合运行的实践方式[J]. 农村电气化, 2012(6): 29-30.
[15] 刘泽元,冯尧,梁硕,等.航天器热试验加热电缆绝缘自动测试系统的设计[J].电子测量技术,2017,40(9):252-256.
[16] 刘鸿,刘磊,林圣,褚继峰,等.电缆局放检测振荡波测试系统仿真与开发[J].电子测量技术,2016,39(11):6-10.
[2] 蔡成良. 浅谈湖北电网高压电缆金属护套环流问题[J]. 湖北电力,2010, 34(4):21-22,75.
[3] 田金虎,刘渝根,赵俊光,等. 多回同相多根并联高压电力电缆电流分布及金属护套环流计算[J]. 高电压技术,2014, 40(1): 153-159.
[4] 刘英,王磊,曹晓珑. 双回路电缆护套环流计算及影响因素分析[J]. 高电压技术,2007(4): 143-146.
[5] 毛为民. 电力电缆相序阻抗计算与分析[J]. 供用电,2002(4): 24-25.
[6] GODDARD K F, PILGRIM J A, CHIPPENDALE R,et al. Induced losses in three-core SL-type high-voltage cables[J]. IEEE Transactions on Power Delivery, 2015, 30(3): 1505-1513.
[7] 魏新劳,朱博,庞兵,等. 长距离三相电力电缆绝缘在线监测方法[J]. 中国电机工程学报,2015, 35(8): 2079-2086.
[8] KONG X P, WANG Y X, ZHANG Z. Calculation of induced voltage in metal shield of single-core cable operated in parallel[C].International Conference on Power System Technology,2010.
[9] 邓星,蒙绍新,尹项根,等. 多回并联电缆线路参数的不对称性分析[J]. 高电压技术,2010, 36(12): 3119-3124.
[10] 高俊国,于平澜,李紫云,等. 基于有限元法的电缆金属护套感应电压仿真分析[J]. 高电压技术,2014, 40(3):714-720.
[11] 方雷,李勇,王耀辉. LG水电站500 kV交联聚乙烯绝缘电力电缆金属护套感应电压计算[C].电气学术交流会议, 2013.
[12] 罗俊华,张丽,刘毅刚,等. 超高压大截面电力电缆线路热膨胀计算分析[J]. 高电压技术,2010, 36(5): 1281-1286.
[13] 樊友兵,赵健康,钱康,等. 单芯电力电缆同相多根并联运行方式分析与优化[J]. 高电压技术,2010, 36(10): 2607-2612.
[14] 赵作斌,张克杰. 长距离不同电压等级电缆降压混合运行的实践方式[J]. 农村电气化, 2012(6): 29-30.
[15] 刘泽元,冯尧,梁硕,等.航天器热试验加热电缆绝缘自动测试系统的设计[J].电子测量技术,2017,40(9):252-256.
[16] 刘鸿,刘磊,林圣,褚继峰,等.电缆局放检测振荡波测试系统仿真与开发[J].电子测量技术,2016,39(11):6-10.