The design and specification of an appropriate earthing arrangement for substations is essential to provide a low impedance path for earth fault, and lightning currents, and to protect personnel on site from potentially fatal step and. Guidelines for the design, installation, testing and maintenance of main earthing systems in substations. Ieee std 80 equation 52 gives the simplified method as modified by sverak to include the effect of earthing grid depth. Electricity association technical specification 4124. P80 guide for safety in ac substation grounding ieee sa. Operational and safety considerations for light rail dc. A case study 231 determine size of earth mat conductor as per ieee80 determine corrosion correction factor. Fences the grounding conductor for fences required to be grounded by other parts of this code shall meet the requirements of rule 93c5 or shall be steelwire not smaller that stl wg no. Ieee p80d98 draft guide for safety in ac substation grounding. Ieee std 9981996, ieee guide for direct lightning stroke shielding of.
The methodology adopted for designing is based on ieee std. Guide for safety in ac substation grounding ansiieee std 802000, ieee guide for safety in ac substation grounding. Simplified method ieee std 80 equation 52 gives the simplified method as modified by sverak to include the effect of earthing grid depth. The fourthfifth edition continues to build on over 50.
Ac grounding requirements calculator spreadsheet engineers. The cases exposed in the annex b and annex e of the ieee std 80 2000 are used as a reference point 1, for which there are following comparative tables and the corresponding graphs in order to validate the results in this document. This chapter contains safety criteria according to ieee standards, step and touch voltage criteria, reduction factor, simplified equations for mesh and step. Ieee xplore 80 2000 ieee guide for safety in ac substation grounding ieee standard.
Design of earthing system for 400 kv ac substation. Step and touch voltages and grounding potential rise ieee and iec. The intent of this guide is to provide guidance and information pertinent to safe grounding practices in ac substation design. An overview of the ieee standard 81 fallofpotential. This book is a revision of ieee std 1421991, the ieee green book. Recently, the ieee standard 802000 recommends the following equation for a body weight of 70 kg. Ieee guide for safety in ac substation grounding paperback 2000. In the ieee std 802000 there is a following statement. Is using cdegs for design of the substation earthing. Mukhedkar, optimum design of substation in a two layer earth structure. Jul 10, 2017 guideline for earthing of ac substation 1.
Sep 19, 2018 ieee 80 2000 ebook download ieee std revision of ieee std incorporates ieee std cor ieee guide for safety in ac substation grounding. Fortunately, ieee standard 142 provides all the information you need to clear up confusion and develop a. It reflects the experience and sound judgment of a working group made up of engineers active in the design and operation of electrical. Ieee std 1422007 revision of ieee std 1421991 ieee. Ieeee std 80 is by far and away the most controversial standard in the ieee library, and is considered one of the most difficult standards to understand. For equations that we derive, a lettering scheme is used. Part ianalytical study, ieee transactions on power. Ieee 80 20 ieee guide for safety in ac substation grounding.
Electronics and electrical design and engineering civil engineering and design. Ieee std80 is the ieee guide for safety in ac substation grounding. Design and analysis of substation grounding grid with and. Ieee 8020 ieee guide for safety in ac substation grounding. Aug 04, 2000 ieee xplore, delivering full text access to the worlds highest quality technical literature in engineering and technology. The cases exposed in the annex b and annex e of the ieee std 802000 are used as a reference point 1, for which there are following comparative tables and the corresponding graphs in order to validate the results in this document. With help of earthing, the fault current flows down to the earth grid. Introduction the design consideration of substation grounding is important for providing low resistance path to ground, to allow. Ieee std 9981996, ieee guide for direct lightning stroke shielding of substations. The specific purposes of this guide are to a establish, as a basis for design, the safe limits of potential differences that can exist in a substation under fault conditions between points that can be contacted by the human body. Length of area occupied by earthing grid width of area occupied by earthing grid fault level at incoming bus.
For moisture and softy soil 15 % allowance, for rocky area 0 % allowance are. The equation numbers used in this paper refer to the numbers used in that standard for ease of crossreferencing. Page 2 no 2, th main rbi layout jp nagar 7th phase, bangalore 560078. Ac substation grounding requirements calculator spreadsheet. Important formulas for designing a substation grid earthing system.
Ieee guide for safety in ac substation grounding ieee on. Ieee std 4872007, recommended practice for the protection of wireline communication facilities serving electric supply locations. Ieee std 80 2000 ieee guide for safety in ac substation grounding sponsor substations committee of the ieee power engineering society. He is a member of ieee, nfpa, and tau beta pi national engineering honor society. Ieee std 802000 revision of ieee std 801986 ieee guide for safety in ac substation grounding sponsor substations committee of the ieee power engineering society approved 30 january 2000 ieeesa standards board abstract. He is part of the ieee working group of the pes substations committee for the revision of ieee 80 and ieee 81 substation grounding standards. Guideline for application of ieee 80 for earthing of ac.
The institute of electrical and electronics engineers ieee standard 812012 guide for measuring earth resistivity, ground impedance, and earth surface potentials of a grounding system, suggests the fallofpotential grounding test to be used to evaluate the capacity of an electrical grounding systemit is often used by subcontractors to power engineers. The tbb shall be sized at 2 kcmil per linear foot of conductor. For high voltage substations, i would strongly recommend ieee std 802000, ieee guide for safety in ac substation grounding abstract. High voltage substation grounding earthing electric power. Vkes vidyuth kanti engineering services contents what is earthing4 why do we do earthing4 what is the scope of this guideline 4 how to.
Typically copper, copperclad steel, aluminum, and steel. The association is chartered under this name and it is the full legal name. Ieee xplore, delivering full text access to the worlds highest quality technical literature in engineering and technology. Institute of ele ctrical and electronic engine ers, inc. Ieee and its members inspire a global community through ieee s highly cited publications, conferences, technology standards, and professional and educational activities. Design of grounding system for an electrical substation. Green insulated copper conductor, minimum as specified in the table below, size 6 awg. Pdf grounding system design in electrical substation.
Ieee 8020 ieee guide for safety in ac substation grounding paperback january 1, 2015 by ieee author see all 2 formats and editions hide other. Step and touch voltages and grounding potential rise ieee. This recommended practice has served electrical engineers seeking electrical system grounding information since the first edition in 1956. Ieee 80 20 ieee guide for safety in ac substation grounding ieee on. For high voltage substations, i would strongly recommend ieee std 802000, ieee guide for safety in ac substation grounding. Choosing a conductor with relations to corrosion problems. In the ieee std 80 2000 there is a following statement. It must not be used or referred to as a zambian standard. So far i am using documents ieee std 80 2000 and nesc 20. Outdoor ac substations, either conventional or gasinsulated, are covered in this guide.
Design of earthing grounding system in a substation grid. Ieee and its members inspire a global community through ieees highly cited publications, conferences, technology standards, and professional and educational activities. Ieee std 80 also includes methods for reducing soil resistivity in section 14. The green book deals mainly with industrial systems. Consistent adherence to ieee standard 142 would save billions of dollars annually over todays common practices. Ieee p80d98 draft guide for safety in ac substation. Ansiieee std 802000, ieee guide for safety in ac substation grounding. Ieee std80 is the ieee guide for safety in ac substation earthing.
To many of us, properly designing and installing a commercial or industrial grounding system is often a confusing process. Guideline for earthing of ac substation linkedin slideshare. The 2000 edition do the standard introduced a flawed method for the calculation of a 2layer soil structure, and only briefly discusses multilayer structures. Vkes vidyuth kanti engineering services contents what is earthing 4 why do we do earthing 4 what is the scope of this guideline 4 how to protect a person in a substation against electrical. Design of earthing system for 400 kv ac substation a case. Step and touch potentials, ground potential rise, absolute potential, ieee std. The cross section of the buried cable should calculated in accordance with the value of the phasetoearth short. Fortunately, ieee standard 142 provides all the information you need to clear up confusion and develop a good grounding design. Ieee 802000 ebook download ieee std revision of ieee std incorporates ieee std cor ieee guide for safety in ac substation grounding. Information is given on how to ground the system, where the system should be grounded, and how to select equipment for the ground of the neutral.
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