Protection Scheme of New Continuous Cable Power Supply System
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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.
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关键词:
- 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.
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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
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 下载:
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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 下载:
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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 D1and D2loops under various working conditions
工况 UT1/kV UT2/kV UT3/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 下载:
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