Substation Grounding Grid Diagnosis Applying Optimization Techniques Based on Measurements and Field Tests
Substation Grounding Grid Diagnosis Applying Optimization Techniques Based on Measurements and Field Tests
复制标题
基于实测和现场试验的变电站接地网诊断优化技术
DOI：
10.1109/tia.2020.2966187
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发表时间：
2020-03
影响因子：
4.4
通讯作者：
M. Telló;D. Gazzana;Victor B. Telló;Lucas T. C. Pulz;R. Leborgne;A. Bretas
中科院分区：
文献类型：
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作者：
M. Telló;D. Gazzana;Victor B. Telló;Lucas T. C. Pulz;R. Leborgne;A. Bretas
考虑到城市变电站接地网诊断，一些实际物理约束导致测量过程的挑战：1）用于测量接地系统的等效阻抗的电极之间的有限长度; 2）确定从接地网导体流向大地的电流;以及3）确定电网电阻。在这种情况下，当发生接地故障时，对被测接地网提供的安全性进行充分诊断不是一项微不足道的任务。本文介绍了一种方法，允许一个可靠的诊断有关的变电站接地网提供的安全。该方法适用于在进行现场测试中获得的参数。该方法有两个步骤。首先采用减小电极间距的电位降法确定接地系统的等效阻抗。然后，获得接地电流。在这两个阶段中，优化技术被应用到控制被调查现象的特定方程。考虑到现实生活中的数据比较案例研究说明了该方法的有效性。
Considering urban substations ground grid diagnosis, some real-physical constraints result in measurement process challenges: 1) limited length between electrodes used to measure the equivalent impedance of the grounding system; 2) to determine the current that flows from ground grid conductors to the earth; and 3) to determine the grid resistance. In this scenario, an adequate diagnosis of the safety offered by the ground grid under test when a ground fault occurs is not a trivial task. This article describes a methodology that allows a reliable diagnosis regarding the safety provided by a substation ground grid. The methodology is applied to the parameters obtained in performed field tests. The method has two steps. First, the fall-of-potential method with reduced distances between electrodes is used to determine the equivalent impedance of the grounding system. Then, the ground current is obtained. In both stages, optimization techniques are applied to the specific equations that govern the phenomenon under investigation. Comparative case studies considering real-life data illustrate the effectiveness of the method.