یک رویکرد جدید برای طراحی سیستم ارتینگ با استفاده از روش اجزاء محدود

نوع مقاله: مقاله پژوهشی

نویسندگان

1 کارشناس ارشد – دانشکده مهندسی برق، دانشگاه لرستان، ایران

2 استادیار – دانشکده مهندسی برق، دانشگاه لرستان، ایران

چکیده

حفاظت از تجهیزات، ایمنی افراد و تداوم تامین برق از اهداف اصلی سیستم زمین هستند. برای طراحی دقیق سیستم زمین، تعیین توزیع پتانسیل بر روی سطح زمین و مقاومت معادل سیستم ضروری است. آگاهی از چنین پارامتر هایی اجازه بررسی امنیت ارائه شده توسط سیستم زمین، هنگامی که خرابی در سیستم های قدرت وجود دارد را می دهد.یک روش جدید برای طراحی سیستم ارتینگ با استفاده از روش اجزاء محدود (FEM) در این مقاله ارائه شده است. در این روش، تاثیری که رطوبت و دما بر رفتار مقاومت مخصوص زمین دارند در طراحی سیستم ارتینگ در نظر گرفته شده است. سیستم ارتینگ در دو حالت الکترود میله عمودی و الکترود نوع صفحه ای دفن شده در زمین در نظر گرفته شده است. مقاومت سیستم زمین، عامل بسیار مهمی در فرایند طراحی است که با استفاده از روش اجزاء محدود محاسبه می شود. روش المان محدود برای حل معادله دیفرانسیل با مشتقات جزئی حاکم بر رفتار سیستم استفاده شده است.4.4 COMSOL Multiphysics یکی از بسته هایی است که با FEM کار می کند و به عنوان یک ابزار در این طراحی مورد استفاده قرار گرفته است. در نهایت به منظور صحت نتایج ارائه شده، مقادیر مقاومت طراحی شده توسط COMSOL Multiphysics با مقادیر فرمول تحلیلی اثبات شده برای مقاومت زمین، مقایسه شده است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

A Novel Approach for Earthing System Design Using Finite Element Method

نویسندگان [English]

  • Sajad Samadinasab 1
  • Farhad Namdari 2
  • Mohammad Bakhshipoor 1
1 yMSc - Department of Engineering, Lorestan University, Khorramabad, Iran
2 Assistant Professor - Department of Engineering, Lorestan University, Khorramabad, Iran
چکیده [English]

Protection of equipment, safety of persons and continuity of power supply are the main objectives of the grounding system. For its accurate design, it is essential to determine the potential distribution on the earth surface and the equivalent resistance of the system. The knowledge of such parameters allows checking the security offered by the grounding system when there is a failure in the power systems. A new method to design an earthing systems using Finite Element Method (FEM) is presented in this article. In this approach, the influence of the moisture and temperature on the behavior of soil resistivity are considered in EARTHING system DESIGN. The earthing system is considered to be a rod electrode and a plate type electrode buried vertically in the ground. The resistance of the system which is a very important factor in the design process is calculated using FEM. FEM is used to estimate the solution of the partial differential equation that governs the system behavior. COMSOL Multiphysics 4.4 which is one of the packages that work with the FEM is used as a tool in this design. Finally the values of the resistance obtained by COMSOL Multiphysics are compared with the proven analytical formula values for the ground resistance, in order to prove the work done with COMSOL Multiphysics.

کلیدواژه‌ها [English]

  • Finite element method (FEM)
  • earthing design
  • grounding grids
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