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首页> 外文会议>2015 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies >Measurement and calculation of potential shifting current in ?? 800kV HVDC converter station
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Measurement and calculation of potential shifting current in ?? 800kV HVDC converter station

机译：??中电位移动电流的测量和计算800kV HVDC换流站

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摘要

The reliable and stable operation of ultra HVDC transmission system contributes to the safe operation of the power grid, thus to carry out live working is of great significance in converter station. Shift of potential is the most important aspects of entering equal-potential. At the moment of shift of potential, the strong arc and large pulse current will occur between the bus and operation worker. Research on the characteristics of the potential shift current is benefit to take appropriate protective measures. Based on NI9165 wireless data acquisition card pulse current measurement system was applied to measure potential shifting currents during the process of entering +800 kV DC converter station bus. According to the characteristics of access to DC converter station polar bus equal-potential, potential distribution and capacitor between worker and polar buses were studied using the electromagnetic analysis software in the process of entering the equal potential. Equal potential transfer analysis model was built according to these parameters and potential shifting current were calculated in UHV DC converter station. Entering potential shifting current pulse is of the highest value 150 A with positive and negative polarity pulse, pulse width for dozens of μs in the process of entering equal-potential. Potential shifting current simulation calculation results is that maximum is 190 A, pulse width of 10 μs. Calculation and measurement results show that the potential shifting current UHV DC converter station is far less than UHV AC lines. such as potential in the process of potential shifting current pulse is mainly caused by the arc extinguish and renewed between bus and workers repeatedly, and workers should be quick into and out of the equal-potential during contacting and out of a live conductor, in order to avoid arc burns damage to workers, potential shifting bar is recommended to use during into and out of the bonding process.
机译：特高压直流输电系统的可靠稳定运行，有利于电网的安全运行，因此在带换电站进行带电作业具有重要意义。势移是进入等势的最重要方面。在电位偏移的时刻，在母线和操作人员之间会发生强电弧和大脉冲电流。对电位偏移电流的特性进行研究有助于采取适当的保护措施。基于NI9165无线数据采集卡，采用脉冲电流测量系统测量+800 kV直流换流站母线进入过程中的电位漂移电流。根据进入直流换流站极性母线等电位的特点，在输入等电位的过程中，使用电磁分析软件研究了工作母线与极性母线之间的电位分布及电容器。根据这些参数建立了均等的电位传递分析模型，并在特高压直流换流站计算了电位转移电流。输入电位移位电流脉冲具有正极性和负极性脉冲的最大值为150 A，在输入等电位过程中脉冲宽度为几十微秒。潜在的偏移电流仿真计算结果为最大值为190 A，脉冲宽度为10μs。计算和测量结果表明，特高压直流换流站的潜在移动电流远小于特高压交流线路。例如，在电位移变电流脉冲过程中的电位主要是由熄灭并在总线上与工人之间反复更新引起的，因此在接触和带电导体时，工人应迅速进入和退出等电位，以便为避免电弧灼伤工人，建议在进出粘结过程中使用潜在的移位杆。

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