Effects of Ground Grid Configuration of Two Neighbouring Distribution Substations on Ground Potential Rise in MEA’s Power System

A. Phayomhom, S. Sirisumrannukul, Apinan Vigittomrongsak, Tawiwat Roopkaew, B. Ainsuk
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Abstract

This paper presents construction planning procedures for a new small (temporary) or permanent distribution substation to replace an existing distribution substation that is served as a small or permanent substation to supply the load of the existing distribution substation while it has not yet been removed. In the meantime when the ground grids of the two substations are electrically disconnected, the auxiliary grounding system of the existing distribution substation can create steep ground potential rise between the ground grids of the two substations and hence introduces a risk for those who are working nearby. It is therefore important to incorporate safety criteria described in terms of step and touch voltage into electrical designs without any potential electrical hazards. Modeling and simulation is carried out on the Current Distribution Electromagnetic interference Grounding and Soil structure (CDEGS) program. A sequential transition process from the existing distribution substation to a new distribution substation is suggested to comply with the IEEE standard 80-2000. The results in this paper could be served a guideline in grounding system design of distribution substation and modification of grounding standards in MEA’s power distribution system.
邻近两个配电变电站地网配置对MEA电力系统地电位上升的影响
本文介绍了一个新的小型(临时)或永久性配电变电站的施工规划程序,以取代现有的配电变电站作为小型或永久性变电站,以提供现有配电变电站的负荷,而现有配电变电站尚未拆除。同时,当两个变电站的地网断开时,现有配电变电站的辅助接地系统会在两个变电站的地网之间产生陡峭的地电位上升,从而给附近工作人员带来危险。因此,在没有任何潜在电气危险的情况下,将步进电压和接触电压所描述的安全标准纳入电气设计是很重要的。对电流分布电磁干扰接地与土壤结构(CDEGS)程序进行了建模与仿真。为了符合IEEE 80-2000标准,建议采用从现有配电变电站到新建配电变电站的顺序过渡过程。本文的研究结果对配电变电所接地系统的设计和MEA配电系统接地标准的修改具有指导意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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