利用智能软件对特高压变电站地网进行设计分析与优化

2014 The 1st International Conference on Information Technology, Computer, and Electrical Engineering Pub Date : 2014-10-26 DOI:10.1109/ICITACEE.2014.7065768

M. U. Aslam, Muhammad Usman Cheema, Muhammad Bilal Cheema, Muhammad Samran

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引用次数: 8

摘要

500KV变电站是巴基斯坦电力系统的重要组成部分。它们覆盖面积大，满足整个电力系统的功率需求。对变电站地网系统进行认真的分析，以保护电网，保持系统的正常运行。为此选择了一个实用的500KV变电站，即RAWAT电网站。对变电站的接地系统进行了详细的研究，并收集了实际数据进行分析。重要的是要提到在数据收集阶段采用的最新IEEE 81 2013方法。采用ETAP软件12版进行网络建模和分析。使用最新版本ETAP即ETAP 12中包含的地网系统(GGS)模块进行分析。首先在ETAP-12中进行建模，然后使用IEEE 80-2000改进方法对实际地网格进行分析，评估步进电位、地电位上升、地电阻、导体/棒的短期温升和接触电位。指出了现有网格存在的不足，并提出了相应的整改措施。由于新电力变压器的安装，变电站计划进行扩建，这将导致变电站整体故障水平上升。在一个案例研究中考虑了故障级别的增加，并提供了可能的解决方案。还为该地区设计了一个新的地面网格，它将作为未来在该特定地区设计的变电站的模型，并保持基本参数。此外，还为750千伏变电站设计了一个新的地面网格，因为它将在不久的将来成为我们国家电网的一部分，因为巴基斯坦国家电力公司正在进行在该地区建立第一个750千伏变电站的可行性研究。通过实例分析，解释了地网网格形状、深度和尺寸的变化对地网电阻和各安全参数的影响。

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Design analysis and optimization of ground grid mesh of extra high voltage substation using an intelligent software

The 500KV substations are important for power system in Pakistan. They cover large area meeting the power requirement of whole power system. The ground grid system of substation has to be carefully analyzed in order to protect the grid, keep the system functional. A practical 500KV substation is chosen for this purpose i.e. RAWAT Grid Station. The grounding system of substation is studied in detail along with practical data collection for the purpose of analysis. It is important to mention about latest IEEE 81 2013 methods which have been adopted during data collection phase. The ETAP software version 12 is used for modeling and analysis of network. The Ground Grid System (GGS) module included in latest version of ETAP i.e. ETAP 12 is used for analysis. Firstly modeling is done in ETAP-12, afterwards analysis is performed on actual ground mesh using IEEE 80-2000 improved methods to evaluate step potential, ground potential rise, ground resistance, short term temperature rise of conductors /rods & touch potential. The shortcomings in existing grid mesh are highlighted and remedial actions are suggested to rectify the problems. The extension is planned in the substation regarding installation of new power transformer which will result to in rise of overall substation fault level. The increase in fault level is considered in one case study and possible solution is provided. A new ground mesh is also designed for this area which will serve as a model for future substations which will be designed in this particular area keeping in view essential parameters. A new ground mesh is also designed for 750KV substation, as it will be part of our national grid in near future as feasibility study is ongoing in NTDC Pakistan for the establishment of first 750KV substation in this area. The variation in ground grid resistance and various safety parameters with the change in ground grid mesh shape, depth and size is explained by the help of results obtained through Case studies.

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2014 The 1st International Conference on Information Technology, Computer, and Electrical Engineering

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