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3712: Substation Grounding Design Review Spreadsheet

Under line to ground fault conditions, the available Ground Potential Rise (GPR) on a grounding system and resulting Step/Touch voltages must be within safe and tolerable levels. These voltages are calculated using grounding system design software. Field measurements are taken for soil electrical resistivity to use as input for the design software used in these calculations.This project provides a tool, in a spreadsheet table form, to predict GPR and Step/Touch safety conditions knowing the appr

Jul 3, 2014 - Aug 3, 2015

GL

Research

30145: Simulation Study of Safe Grounding Methods for the Operation of High Voltage Disconnect Switches

High-voltage (HV) disconnect switches are typically operated without incidence; however, each operation presents an increased risk for flashover. When a flashover occurs, the worker operating the switch can experience a potentially hazardous voltage (exposure voltage) across their body. Despite extensive discussions in the industry, the best switch grounding method to limit the exposure voltage experienced by the operator has yet to be established.This report on safe grounding methods, covering

Aug 24, 2022 - Feb 26, 2025

GL

SE

Research

3718: Ensuring the integrity of Working Ground Connection Points in Stations

Temporary protective grounding is crucially important for ensuring the safety of workers, the public and the protection of power system equipment. The proper connection of working grounds to the buried ground grid conductors is essential to safe working conditions in a substation. This report summarizes the key findings of technical standards and reports, as well industrial experiences on temporary protective grounding, compatibility between attachment points and clamps, and worker exposure volt

Jan 13, 2016 - Sep 15, 2016

GL

Research

3736: Ground Potential Rise Transferred Potentials Along Feeder Grounding Systems

GL

Research

3721: Gradient Control around Bucket Trucks and Forestry Vehicles

Gradient control around bucket trucks and forestry vehicles is extremely important to ensure a safe environment for workers and the public and to protect power system equipment. Utility safety rules require bucket trucks to be adequately grounded by bonding the vehicle to the system neutral, overhead ground wires, or a ground rod. However, grounding the vehicle through a temporary ground rod may not guarantee line protection operation during a fault condition, depending on its resistance to eart

Jan 8, 2019 - Feb 17, 2020

GL

Research

3705A: Grounding System Maintenance Guide

Grounding systems are crucially important components of any power supply system because they impact public and employee safety, supply system reliability, power quality and life expectancy of power equipment. This report provides guidelines for maintenance of different components of grounding systems, from simple grounding systems such as a single ground rod to the complex grounding systems employed in large substations. Grounding systems with both primary electrodes and auxiliary electrodes are

GL

Research

3710: Review of Distribution System Grounding Practices and Rules

Distribution systems have faced substantive and significant changes over recent years as a result of an increase in non-linear loads, the connection of distributed generation, a growing mindfulness for the protection of dairy animals against stray voltages, as well as the need to improve efficiencies and controllability. In response, designers are making changes to topologies, adding new protection and control devices, increasing distribution voltage levels, and paying more attention to neutral

Jun 3, 2014 - Jan 20, 2016

DEP

GL

Research

3738: Corrosion Effects on Buried Grounding Systems Conductors

GL

Research

3735: Guidelines and Training on the use and application of Clamp-on Ground Testers

This project investigated the theory behind ground resistance measurement using one of the most recent and convenient devices available in the market. A clamp-on ground resistance meter is a relatively small piece of equipment that measures a ground grid’s resistance by clamping the device around the electrode being tested without detaching the electrodes from the system. Since this device is relatively new and different from other grounding test equipment, operators might misunderstand its read

Sep 28, 2021 - Jun 19, 2024

GL

Research

3707: Recommended Grounding Practices: Determine Causal Factors of and Resolve Bolt Failures in Concrete Poles

This research project investigated the root cause of premature steel bolt degradation in concrete poles and identified the best practices for grounding concrete poles to mitigate degradation of steel bolts and/or reinforcing steel bars (rebar). The report recommends techniques for grounding existing and new concrete pole installations, with the objective of eliminating the flow of electric current through the steel bolts and rebar. The report is based on operating experience of GLIG member utili

Jun 17, 2013 - Feb 16, 2015

GL

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