Ground Potential Rise (GPR) Studies
IEEE 80 and IEEE 367 compliant GPR studies to protect personnel and equipment from dangerous voltages during fault events.
Service Overview
Ground Potential Rise (GPR) is the maximum electrical potential that a substation grounding grid may attain relative to a distant grounding point assumed to be at the potential of remote earth. During a fault event, large fault currents flow through the grounding system, raising the local earth potential to dangerous levels. Without proper analysis, personnel, equipment, and telecommunications circuits can be exposed to hazardous voltages.
E&S Grounding Solutions provides comprehensive GPR studies for substations, transmission lines, communication facilities, and industrial plants. Our engineers use IEEE 80 and IEEE 367 methodologies combined with advanced CDEGS software modeling to calculate GPR values, assess hazard zones, and design protective measures that keep personnel safe and equipment operational.
Key Benefits
- IEEE 80 and IEEE 367 compliant GPR analysis
- Personnel safety assessment for touch and step voltages
- Telecommunications circuit protection (ANSI/IEEE C37.92)
- Hazard zone mapping and mitigation design
- CDEGS software modeling for complex geometries
- Coordination with utility protection engineers
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+1 310-318-7151Our Process
Data Collection
Gather soil resistivity data, fault current levels, clearing times, and existing grounding system parameters.
GPR Calculation
Calculate maximum GPR using IEEE 80 methodology and CDEGS software for the worst-case fault scenario.
Hazard Assessment
Evaluate touch and step voltages against IEEE 80 tolerable limits for the specific soil conditions and fault clearing time.
Telecom Protection
Assess GPR impact on telecommunications circuits per IEEE 367 and design isolation and protection measures.
Mitigation Design
Design grounding improvements, gradient control conductors, insulating barriers, or other protective measures as required.
Report & Drawings
Deliver a complete engineering report with GPR values, hazard maps, mitigation recommendations, and construction drawings.
Standards & Codes
Industries Served
Related Technical Articles
What Is Ground Potential Rise and Earth Potential Rise?
Learn how GPR is calculated, what voltage levels are considered hazardous, and how proper grounding design protects personnel and equipment during fault events.
What is Step and Touch Potential and Reducing Resistance to Ground?
Step and touch voltages are the primary hazards associated with GPR events. Learn how they are calculated and how grounding design minimizes the risk.
Frequently Asked Questions
What is Ground Potential Rise (GPR)?
Ground Potential Rise (GPR) is the maximum electrical potential that a substation grounding grid may attain relative to a distant grounding point (remote earth) during a fault event. It is calculated as the product of the maximum grid current and the grounding system impedance. GPR values can reach tens of thousands of volts at large substations, posing serious hazards to personnel and equipment.
When is a GPR study required?
GPR studies are required whenever a telecommunications circuit enters a substation or other high-voltage facility, when new substations are designed, when fault current levels increase due to system upgrades, and when personnel safety concerns exist at existing facilities. Utilities, telecom companies, and NERC reliability standards often mandate GPR studies as part of facility design and interconnection agreements.
What standards govern GPR studies?
The primary standards for GPR studies are IEEE 80 (Guide for Safety in AC Substation Grounding), IEEE 367 (Recommended Practice for Determining the Electric Power Station Ground Potential Rise and Induced Voltage from a Power Fault), and IEEE 487 (Recommended Practice for the Protection of Wire-Line Communication Facilities Serving Electric Supply Locations). E&S Grounding Solutions designs to all applicable standards.
How does E&S Grounding Solutions perform GPR studies?
E&S Grounding Solutions uses a combination of IEEE 80 analytical methods and CDEGS software for complex geometries. Our engineers collect site-specific soil resistivity data, fault current levels, and grounding system parameters, then calculate GPR values and assess touch and step voltage hazards for the worst-case fault scenario.
Request a GPR Study Proposal
Contact our team of licensed engineers to discuss your project requirements and receive a customized proposal.