新型电缆贯通供电系统的保护方案

张丽艳; 罗博; 郑兴; 刘逾霄; 王杰

doi:10.3969/j.issn.0258-2724.20220510

新型电缆贯通供电系统的保护方案

doi: 10.3969/j.issn.0258-2724.20220510

张丽艳^1,,
罗博^1,,
郑兴¹,
刘逾霄²,
王杰²

1.
西南交通大学电气工程学院，四川成都 610031
2.
西南交通大学唐山研究院，河北唐山 063000

基金项目: 国家自然科学基金（51877182）；四川省科技计划（2020YJ0011）

详细信息

作者简介:
张丽艳（1979—），女，副教授，博士，研究方向为新型牵引供电理论，E-mail：xphfy@swjtu.edu.cn

中图分类号: U223
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- 被引次数: 0
出版历程
- 收稿日期: 2022-07-21
- 修回日期: 2022-11-09
- 网络出版日期: 2023-06-15
- 刊出日期: 2022-12-01

Protection Scheme of New Continuous Cable Power Supply System

1.
School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China
2.
Tangshan Institute, Southwest Jiaotong University, Tangshan 063000, China

摘要

摘要:
为解决新型电缆贯通供电系统的接触网和牵引电缆使用现有分段保护方案会误动作的问题，研究负荷电流对接触网电流纵差保护的作用机理，提出接触网采用故障分量电流纵差保护方案；并利用相量法分析空载情况下电容电流对牵引电缆现有保护方案的影响，通过在每个分段回路牵引电缆的首、末两端空载时并联电抗器，及负载时切除电抗器，实现电流纵差的保护. 研究结果表明：接触网中的负荷电流由两侧牵引变压器一起供给是引起接触网电流纵差保护误动作的原因，而提出的采用故障分量电流构成的接触网短路保护不受双边供电下正常负荷电流的影响；空载情况下，电容电流会使牵引电缆末端电流较首端电流的幅值和相角发生变化，导致保护误动作，提出的牵引电缆首末两端并联电抗器的方法可以解决这个问题.
- 新型电缆贯通供电系统 /
- 分段保护 /
- 电流纵差保护 /
- 故障分量电流 /
- 电容电流
Abstract:
In order to solve the problem of misoperation of catenary and traction cables in a new continuous cable power supply system using the existing sectional protection scheme, firstly, the mechanism of load current on current longitudinal differential protection of the catenary was studied, and a fault component current longitudinal differential protection scheme of the catenary was proposed. Then the phasor method was used to analyze the influence of capacitance current on the existing protection scheme of traction cables under no load condition. The protection of longitudinal current difference was realized by shunting reactors at both ends of the traction cable in each sectional loop under no load and cutting off the reactor under load. The results show that the load current in the catenary supplied by the traction transformers on both sides is the cause of the misoperation of the current longitudinal differential protection of the catenary. However, the proposed short-circuit protection of the catenary composed of fault component current is not affected by the normal load current under the bilateral power supply. Under no load condition, the capacitance current will change the amplitude and phase angle of the end current of the traction cable compared with the first end current, resulting in the misoperation of the protection. The proposed method of shunting reactors at both ends of traction cables can solve this problem.
- new continuous cable power supply system /
- sectional protection /
- current longitudinal differential protection /
- fault component current /
- capacitance current

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图 1 电缆贯通供电系统结构

Figure 1. Continuous cable power supply system structure

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图 2 接触网分段保护结构示意

Figure 2. Catenary sectional protection structure

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图 3 故障分量电流原理

Figure 3. Principle of fault component current

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图 4 D₁、D₂故障附加状态

Figure 4. D₁ and D₂ fault additional status

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图 5 D₁、D₂故障分量电流相量

Figure 5. D₁ and D₂ fault component current phasor

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图 6 接触网保护动作程序框图

Figure 6. Procedure of catenary protection action

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图 7 D₁电缆回路等值电路

Figure 7. Equivalent circuit of D₁ cable loop

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图 8 D₁电缆回路电流、电压相量

Figure 8. Current and voltage phasors of D₁ cable loop

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图 9 D₂电缆回路等值电路

Figure 9. Equivalent circuit of D₂ cable loop

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图 10 D₂电缆回路电流、电压相量

Figure 10. Current and voltage phasors of D₂ cable loop

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图 11 电容电流补偿示意

Figure 11. Capacitance current compensation

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图 12 牵引电缆保护动作流程

Figure 12. Procedure of traction cable protection action

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图 13 负荷电流和组合式同相供电补偿电流关系

Figure 13. Relationship between load current and compensation current of combined in-phase power supply

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图 14 电缆贯通供电系统仿真模型

Figure 14. Simulation model of continuous cable power supply system

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图 15 工况1电压电流波形

Figure 15. Voltage and current waveforms under condition 1

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图 16 工况2电压电流波形

Figure 16. Voltage and current waveforms under condition 2

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图 17 工况3电压电流波形

Figure 17. Voltage and current waveforms under working condition 3

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图 18 工况4电压电流波形

Figure 18. Voltage and current waveforms under working condition 4

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表 1 工况1数据

Table 1. Data under working condition 1

方法	U₁/kV	U₂/kV	U₃/kV	D₁ 差动电流/A	D₁ 制动电流/A	D₂ 差动电流/A	D₂ 制动电流/A
现有方法	17.198	17.247	17.385	491.264	0	496.225	0
本文方法	17.198	17.247	17.385	0	0	0	0

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表 2 工况2数据

Table 2. Data under working condition 2

方法	U₁/kV	U₂/kV	U₃/kV	D₁差动电流/A	D₁制动电流/A	D₂差动电流/A	D₂制动电流/A
现有方法	22.402	13.588	19.798	582.223	0	8951.995	0
本文方法采样 1	26.719	26.291	26.813	84.654	332.961	3480.336	828.158
本文方法采样 2	25.524	23.080	24.869	115.695	1049.229	11058.398	2368.965
本文方法采样 3	25.103	21.813	24.144	11.336	1161.157	13402.426	2740.661
本文方法采样 4	24.627	20.622	23.409	120.269	382.164	7222.369	1448.219
本文方法采样 5	23.018	15.829	20.827	144.321	682.623	2614.296	442.224
本文方法采样 6	22.402	13.588	19.798	36.965	1012.364	6693.269	1117.495

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表 3 空载电容电流

Table 3. Capacitance current without load A

D₁左侧	D₁右侧	D₂左侧	D₂右侧
33.522i	33.429i	40.123i	40.284i

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表 4 各种工况下回路D₁、D₂供电电缆数据

Table 4. Data of power supply cables in D₁ and D₂ loops under various working conditions

工况	U_T1/kV	U_T2 /kV	U_T3/kV	D₁差动电流/A	D₁制动电流/A	D₂差动电流/A	D₂制动电流/A
负载正常运行	54.784	55.042	55.019	66.124	284.125	83.256	155.546
负载 D₁供电电缆接地	24.124	32.890	32.821	9154.159	9049.589	77.553	94.227
负载 D₁电缆相间短路	0.653	24.842	24.677	12614.594	12186.234	35.556	85.269
现有方法空载非短路运行	35.326	35.228	35.368	63.334	0	79.956	0
现有方法空载 D₁供电电缆接地	24.390	32.984	33.055	9191.226	0	154.953	0
现有方法空载 D₁电缆相间短路	0.686	24.886	24.817	12650.221	0	133.895	0
本文方法空载非短路运行	35.001	35.001	35.001	0.080	221.665	0.110	311.000
本文方法空载 D₁供电电缆接地	24.147	32.765	32.652	9203.228	9038.965	0.211	199.356
本文方法空载 D₁电缆相间短路	0.667	24.837	24.681	12633.968	12178.846	0.051	568.596

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新型电缆贯通供电系统的保护方案

doi: 10.3969/j.issn.0258-2724.20220510

作者简介: 张丽艳（1979—），女，副教授，博士，研究方向为新型牵引供电理论，E-mail：xphfy@swjtu.edu.cn

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Protection Scheme of New Continuous Cable Power Supply System

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作者简介:
张丽艳（1979—），女，副教授，博士，研究方向为新型牵引供电理论，E-mail：xphfy@swjtu.edu.cn