4.1 Objectives of grounding 4.2 Tolerable body current limits 4.3 Effect of frequency on body impedance 4.4 Criteria for tolerable touch and step voltages
: The potential difference experienced by a person bridging a 1-meter distance with their feet while walking on the earth's surface.
IEEE 80-2013 uses empirical research by Charles Dalziel to define tolerable limits based on body weight (typically 50 kg or 70 kg) and the duration of the fault.
: Includes the use of high-resistivity surface materials (like crushed rock) to increase the tolerable touch and step voltages for personnel. Design Refinement Methods ieee std 80 2013
The primary intent of IEEE Std 80-2013 is to establish safe limits for potential differences that can be contacted by the human body during a ground fault. Its scope covers:
(Sverak): [ E_m = \frac\rho \cdot K_m \cdot K_i \cdot I_GL_M ]
6.1 Division of fault current between grid and neutral 6.2 Asymmetrical current factor (decrement factor) 6.3 Current split factor (grid current vs. remote earth) Design Refinement Methods The primary intent of IEEE
: The primary goal of this standard is to ensure public safety around electrical power lines and substations, focusing on preventing electrical shock hazards.
12.1 Small substation grid design 12.2 Large substation with multiple soil layers
| | Key Points | |-----------|----------------| | Objective | Limit step and touch voltages below tolerable thresholds for a 50 kg or 70 kg human during a line-to-ground fault. | | Tolerable Body Current | Based on ventricular fibrillation; uses 50 kg (110 lb) and 70 kg (154 lb) body weights. | | Soil Resistivity | Must be measured via Wenner 4-pin method; seasonal variation considered. | | Crushed Rock Layer | High resistivity layer (typically 3000 Ω·m) reduces touch/step voltages. | | Fault Current | Maximum grid current (I G ) = symmetrical fault current × decrement factor × current split factor. | | Conductor Sizing | Based on short-time thermal capacity (melting temperature of copper, steel, aluminum, etc.). | | Mesh Voltage (E m ) | Worst-case touch voltage inside grid; must be < E touch50 . | | Step Voltage (E s ) | Worst-case step voltage near grid perimeter; must be < E step50 . | | Fence Grounding | Fence must be bonded or isolated; touch voltage at fence is critical. | | Transferred Potential | Hazard when ground potential rise (GPR) is transferred out of substation via conductors (e.g., communication cables, pipelines). | 1. j i. MVA MW...
5.1 Design parameters 5.2 Fault current considerations 5.3 Fault duration 5.4 Soil resistivity 5.5 Resistivity measurement techniques (Wenner four-pin method) 5.6 Crushed rock surface layer resistivity
IEEE Std 80-2013, the "IEEE Guide for Safety in AC Substation Grounding," provides the definitive methodology for designing safe grounding grids to protect personnel from electric shock by establishing limits on touch and step voltages. The standard mandates an iterative engineering process focusing on soil resistivity, fault current split factors, and Ground Potential Rise (GPR) to ensure safe substation operations. For technical details on the standard, visit Academia.edu . PTC Community +3 AI can make mistakes, so double-check responses Copy Creating a public link... You can now share this thread with others Good response Bad response 4 sites Karl S Bogha IEEE Std 80 - 2013 (Guide for Safety of AC ... IEEE Std 80 - 2013 (Guide for Safety of AC Substation Grounding) Annex B. Sample Calculation: B1. Set variables: i. 1. j i. MVA MW... PTC Community IEEE-std80.pdf - Slideshare This document is the IEEE guide for safety in AC substation grounding. It provides guidelines and recommendations for properly gro... Slideshare Designing Safe and Reliable Grounding in AC Substations With ... Oct 9, 2025 —