IEEE Std 80 - (Guide for Safety of AC Substation Grounding). Annex B. Sample Calculation: B1. Set variables: ̗ i. ƠƠƠ. ˕1. ̗. j i. ̗. MVA MW. Ieee 80 Ieee For Safety In Ac Substation a method to apply ieee std. 80 safe touch and step - page 1 of 13 a method to apply ieee std. Buy IEEE GUIDE FOR SAFETY IN AC SUBSTATION GROUNDING from SAI Global.
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PDF: ISBN X SS No part of this publication may be reproduced in any Downloaded on May 28, at UTC from IEEE Xplore. PDF: ISBN .. This introduction is not part of IEEE Std 80™- , IEEE Guide for Safety in AC Substation Grounding. (Incorporates IEEE Std P/Cor ). Scope: This guide is primarily concerned with outdoor ac substations, either conventional or.
A quantitative analysis of the effects of lightning surges is also beyond the scope of this guide. Modified Design In this example, the preliminary design will be modified to include 20 ground rods, each 7. Richard P. Upcoming SlideShare. Touch Potential Same potential as towerNo protection
Full Description Scope This guide is primarily concerned with outdoor ac substations, either conventional or gas-insulated. Distribution, transmission, and generating plant substations are included. With proper caution, the methods described herein are also applicable to indoor portions of such substations, or to substations that are wholly indoors.
No attempt is made to cover the grounding problems peculiar to dc substations. A quantitative analysis of the effects of lightning surges is also beyond the scope of this guide.
The intent of this guide is to provide guidance and information pertinent to safe grounding practices in ac substation design. The specific purposes of this guide are to: The concept and use of safety criteria are described in Clause 1 through Clause 8, practical aspects of designing a grounding system are covered in Clause 9 through Clause 13, and procedures and evaluation techniques for the grounding system assessment in terms of safety criteria are described in Clause 14 through Clause Copyrighted Materials This educational activity is protected by copyright laws.
Reproduction, distribution, display and use of the educational activity without written permission of the presenting sponsor is prohibited. Grounding System Design Theory 6. Theoretical Conditions Assumes Homogeneous Environment 8. Actual Field Conditions Non-Homogeneous Environment Illustration of substation ground potential rise equipotential lines 9. REE 3pole3pole Basic Shock Situation Touch Potential Same potential as towerNo protection Body Current Versus Time Grounding System Design Example Substation Design Flowchart For the 13 kV bus fault, the kV equivalent fault impedances must be transferred to the 13 kV side of1 the transformer.
It should be noted that, due to the delta-wye connection of the transformer, only the2 positive sequence kV fault impedance is transferred. Thus3 [ ] Amps j I ,6 Step 3 — Step and Touch Potentials For 0.
Thus, the maximum grid current is based on A.
Step 9 - Em vs. The grid design must be modified. Modified Design In this example, the preliminary design will be modified to include 20 ground rods, each 7.
The revised GPR is 2. The step voltage has not been calculated yet, the new values of Ki, Es, LS, and Ks have to be also calculated. Note that the value for Ki is still 2. Em vs.
Now the calculated corner mesh voltage is lower than the tolerable touch voltage Es vs. The computed Es is well below the tolerable step voltage determined in Step 3 of the initial design.
That is, Modify design. Not necessary for this example.
Detailed design. A safe design has been obtained. At this point, all equipment pigtails, additional ground rods for surge arresters, etc. The NESC requires grounding metal fences used to enclose electric supply substations having energized conductors or equipment. Fence and Gate Jumpers Same Design Parameters Using Software Grounding System: Upper Layer Resistivity Permissible Body Current: Body Weight: Meliopoulos Computer Software Calculations Grounding System Components Mechanical vs.
Exothermic Connectors Molecular bonds guarantee uniform conductivity across the entire cross section of the conductor. Exothermic Mechanical ExothermicCompression