The standard refines the methodology for determining the maximum allowable touch and step voltages, which depend on the surface material resistivity and the fault duration time. 2. Enhanced Calculation Methods
A case study is presented to design an earthing system for a 132 kV substation. The substation has a fault current of 40 kA and a fault duration of 1 second.
This is the official, definitive source for the document. Techstreet: A reputable distributor of industry standards. ANSI Store: The American National Standards Institute. IEEE 80-2013 Design Work Flow: Step-by-Step ieee std 80 2013 pdf download work
The potential difference between a person's feet (typically 1 meter apart) on the earth's surface during a fault Tolerable Limits:
): The potential difference between the metallic structure a person touches and the ground surface where their feet are placed. The standard assumes a standard reach distance of 1 meter (3.3 feet). Step Voltage ( Estepcap E sub s t e p end-sub The standard refines the methodology for determining the
Calculate the actual worst-case mesh and step voltages of the preliminary design.
Multiply the grid current ( Igcap I sub g ) by the grid resistance ( Rgcap R sub g The substation has a fault current of 40
Collect substation site data (area, soil resistivity).
DC substations and detailed quantitative lightning surge analysis 2. Core Safety Concepts The guide’s core philosophy is to create an equipotential ground plane to limit dangerous voltages to safe levels Touch Voltage:
: Detailed breakdowns of the math used in the standard (like fault current and cable sizing) are available in PDF format on the PTC Mathcad Community Technical Summaries