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    Transmission and Substations Contaminated Insulation Interest Group (CIIG) Electrical Discharge Inspection Monitoring (EDIM) Transmission Asset Chatbot (TAC) Transmission Asset Management Analytics Virtual Reality Substation Overhead Transmission Underground Transmission Substations GET SET High Voltage Direct Current (HVDC) EPRI U for Transmission EPRI Transmission Sector Council (TSC) Resources for Transmission and Substations Research About About Site Search Transmission & Substations
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  • Transmission and Substations
    • Contaminated Insulation Interest Group
      • ESDD/NSDD/DDDG Guide
        • Introduction to DDDG Measurements
        • Introduction to ESDD Measurement of Disc Insulators
        • Introduction to NSDD Measurement of Disc Insulators
      • EPRI Resources
      • Future & Past Meetings, Current Members List
      • Computer Based Training (CBT)
    • Electrical Discharge Inspection Monitoring
      • EPRI Resources
      • EDIM Future & Past Meetings, Current Members List
      • Computer Based Training (CBT)
    • Transmission Asset Chatbot (TAC)
    • Transmission Asset Management Analytics
      • Principles and Practices
        • Project Overview
        • Updates & Events
        • Research & Technical Content
          • Library of Commercially available Asset Management Systems
          • A Primer For Understanding & Visualizing Risk
          • Transmission Asset Management Guidebook
            • Introduction
            • Power Delivery Overview
            • Power Delivery Model
            • Maintenance and Management
            • Performance Measures
            • PDAM and Risk
            • Implementing Asset Management
            • A BOTTOM-UP Approach
            • A Top-Down Approach
            • Conclusions and Recommendations
      • Substations Asset Analytics
        • Project Overview
        • Updates & Events
        • Research & Technical Content
          • Circuit Breaker Asset Management Analytics
            • Circuit Breaker Families
              • Family Assignments - Gas Circuit Breakers
              • Family Assignments - Oil Circuit Breakers
            • Circuit Breaker Maintenance Taxonomy
          • Assess and Mitigate Risks Associated with Extended Equipment Lead Times with a Substation Spares Strategy Evaluation
          • Balance of Substations Asset Analytics
            • Asset Management Metrics for Protection and Control Systems – Development and Application of Relay Replacement Hazard Rates
            • Harnessing Substation Battery Data
          • Transformer Asset Health Visualization
      • Overhead Asset Analytics
        • Project Overview
        • Updates & Events
        • Research & Technical Content
          • Wood Pole Fleet Inspection Data Analytics
            • Effectiveness of Original Treatment Type
            • Influence on Delaying Onset of Strength Loss
            • Performance by Species
            • Pole Top vs. Groundline Degradation
          • Analysis of Overhead Conductor and Shield Wire Data Informs Asset Management Decisions
          • Applying Geospatial Information in Overhead Transmission Asset Management
      • Underground Transmission Asset Analytics
        • Project Overview
        • Updates & Events
        • Research & Technical Content
          • Leveraging NLP and ML for Underground Transmission Asset Defect Categorization
          • Underground Transmission System Risk Assessment
      • Contacts
    • Virtual Reality Substation
    • Overhead Transmission
      • Inspecting and Assessing Overhead Transmission Lines
        • Transmission Line Inspection and Assessment
          • Project Overview
          • Updates & Events
          • Research & Technical Content
            • Assessing the BATCAM's Ability to Detect Corona
            • Field Guide: Visual Inspection of Porcelain and Glass Disc Insulators
              • Anatomy of Porcelain and Glass Disc Insulators
              • Definition of Dimensions
              • Maintenance Priority Rating
              • Porcelain Disc Insulators
              • Glass Disc Insulators
            • Selecting Effective Inspection and Assessment Methods and Technologies
            • Yellow Book - Reference Guide
              • Volume 1 - Asset Management
                • Framework for Inspection
                • Inspection and Assessment Program: Establishing and Refining
                • Inspection and Assessment: Methods and Technologies
                • Forensic Analysis of Failures
                • Standardized Nomenclature and Component Condition Rating
              • Volume 2 - Component-Specific Inspection
                • Wood Transmission Structures
                • Steel Transmission Structures
                • Steel Structure Foundations
                • Concrete Foundations
                • Composite Poles
                • Obstruction Marking and Lighting
                • Conductors
                • Compression Connectors
                • Grounding
                • Fiber-Optic Cables
                • Polymer Insulators
                • Porcelain Suspension Insulators
                • Glass Suspension Insulators
                • Connection Hardware on Transmission Structures
                • Component Guide: Animal Deterrents
                • Overhead Transmission Line Air Break Switches
                • Transmission Line Surge Arresters
              • Volume 3 - Application of Methods/Technologies
                • Vegetation
                • Bird Interactions with Transmission Lines
                • Structural Corrosion: Inspection and Assessment Practices
                • Infrared Inspection
                • Daytime Discharge Inspection
                • Using Unmanned Aircraft Systems
                • Satellite Inspection Technology for Transmission Lines
                • Processing Inspection Imagery
                • Selecting Effective Inspection
            • Transmission Inspection Practices and Information Management
        • Connector Management
          • Project Overview
          • Updates & Events
          • Research & Technical Content
            • Overview of Causes of Compression Connector Failure
            • Visual Inspection
            • Dimensioning of Compression Connectors
            • Infrared Thermography of Compression Connectors
            • Radiography of Compression Connectors
            • Resistance Measurement of Connectors
            • Connectors 101 Training
      • Transmission Line Corrosion
        • Conductor, Shield Wire and Hardware Corrosion Management
          • Project Overview
          • Updates & Events
          • Research & Technical Content
            • Corrosion Calculator
            • Atmospheric Corrosion Mapping
            • Condition Assessment Comparison of Two Coastal Aluminum Conductors
            • AAAC Flint Forensic Report
            • Geometry Factor Development
            • Condition Assessment Comparison of Two Coastal Aluminum Conductors
            • Corrosion Monitoring System
            • Corrosion Failure of a Conductor Located Near an Industrial Site
            • Forensic Analysis of Hardware due to Corrosion Damage
        • Structure and Subgrade Corrosion Management
          • Project Overview
          • Updates & Events
          • Research & Technical Content
            • EPRI Approach to Corrosion Monitoring
            • Innovative Cathodic Protection Application for Transmission Tower Concrete Foundations
            • Selection and Application of Coatings
            • Cathodic Protection and the Effects of Stray Current
            • Coating System Selection and Application: Case Study Update
            • Corrosion Monitoring System
            • Steel Pole Inspection
            • Subgrade Corrosion Map Update
      • Lightning Performance and Grounding of Transmission Lines
        • Project Overview
        • Updates & Events
        • Research & Technical Content
          • Lightning Performance and Targets
          • Mechanical Aging of Surge Arrester Leads
          • Alternative Grounding Materials for Counterpoises
          • Drawing Measurement Tool
          • Lightning Impulse Strength Calculation
          • US Ground Flash Density Map
          • US Soil Resistivity Map
          • Structure Surge Impedance Calculator
          • Surge Arresters Database
      • Transmission Line Design
        • Ductile Iron & Composite Structure Management (P35.005)
          • Project Overview
          • Updates & Events
          • Research & Technical Content
            • Effect of Temperature on Strength of Composite Poles: Comparison of Performance to Crossarms
            • Design Methodology for Composite Poles as Anti-Cascading Structures: 2023 Update – Longitudinal Cascading
            • Cantilever Tests on Ductile Iron Poles
            • McWane Poles ductile iron facility visit
            • RS Poles GFRP composite facility visit
            • Evaluation of Wildfire Protection Methods for Composite Utility Structure Materials
            • Recommendations for Grounding of Composite Utility Poles
            • Unaged Pole Break
        • Line Design Tools and Practices for Construction & Maintenance
          • Project Overview
          • Updates & Events
          • Research & Technical Content
            • Mitigating Vortex Induced Vibration on Steel Pole Davit Arms
            • Optimal Line Tension and Conductor Strength (Op10)
            • Transmission Pole Material Selection Guide: 2025 Update – Representative Designs
            • Vibratory Caisson Foundation Pull Test
            • Vibratory Caisson Foundation Test - Marengo, IA
            • EPRI Software Demo: Op10 Version 2.0 – Optimal Line Tension Calculator
        • Enhancing Transmission Line Resiliency
          • Project Overview
          • Updates & Events
          • Research & Technical Content
            • Dynamic Impact Test Line Update Video
            • Impact of Geotechnical Investigation Frequency on Design Reliability
            • Learning From Failure – Case Studies in Improved Engineering
            • Longitudinal Security Loading: Broken Conductors and Longitudinal Cascades
      • Live Working
        • Project Overview
        • Updates & Events
        • Research & Technical Content
          • Live Working Rope – Compilation of Electrical Testing Results
          • Live Working Rope Testing and Specifications
          • ESRI Survey123 Tracking Form Testing and Field Inspection Form for Insulating Tools
          • Selected Standards and Regulations
          • Minimum Approach Distance – IEEE Calculation Procedures
      • Transmission Line Insulators
        • Polymer and Composite Overhead Transmission Line Insulators
          • Project Overview
          • Updates & Events
          • Research & Technical Content
            • Categorization of Hydrophobicity
            • Insulator Corona Cage Test
        • Glass and Porcelain Transmission Line Insulators
          • Project Overview
          • Updates & Events
          • Research and Technical Content
            • Insulator Population Assessment
            • Mechanical Failing Tensile Load Assessment
            • Overview and Terminology of Porcelain and Glass Insulators
            • Key Processes of the Contamination Flashover Process
            • A Study of How Glass Insulators Break
            • The Combined Mechanical and Electrical (M&E) Strength Test
      • Increased Overhead Transmission Capacity
        • Overhead Line Ratings and Increased Power Flow
          • Project Overview
          • Updates & Events
          • Research & Technical Content
            • Capacity Gains from Thermal Uprating
            • Comparing IEEE and Ratings Research Recommendations for LiDAR
            • Conductor Emissivity Testing
            • Conductor Resistance Conversion Calculator
            • Platinum Book Calculator: Conductor Selection & Cost of Losses
            • Ratings Information Session, FERC 881 Update and WindSim DLR Field Trial
            • Variation in AAR based on daily Air Temperatures
            • Weather Based DLR Field Trials at BPA
            • Ambient Adjusted Ratings
            • Solar Heating
            • Solar Heating
            • Answers to Several Frequently Asked Questions on DLR
            • Sunrise-sunset Calculator for Day-night Ratings
            • Sunrise-sunset Calculator for Day-night Ratings
            • Commonly Used Terms and Abbreviations
            • DLR Life Cycle Cost Estimator
            • DLR using a PMU and Topolonet
            • LiDAR collection for uprating – planning tool
            • Solar Flux Calculator
            • Switch Ratings
            • Wave Trap Ratings
        • High Temperature Operation of Overhead Lines
          • Project Overview
          • Updates & Events
          • Research & Technical Content
            • High Temperature Operation of Polymer Insulators
            • Effect of High Temperature on Tensile Strength of Aluminum 1350-H19
            • High Temperature Operations Standards
        • Advanced Conductors
          • Project Overview
          • Updates & Events
          • Research & Technical Content
            • Research Result Summaries
              • Carbon Core Qualification
      • Transmission Line Switch Management
        • Project Overview
        • Updates & Events
        • Research & Technical Content
          • ESRI Survey123 Inspection Form for Commissioning of New Line Switches
          • Quick Break Whip Device Testing
          • Selected Standards
          • Line Switch Commissioning 101
          • Line Switch Quick Break Whip: Test Parameters and Restrike Calculator
      • Contacts
      • Supplemental Projects
    • Underground Transmission
      • Design, Construction, Operation Maintenance of Underground Transmission Systems
        • Project Overview
        • Updates & Events
        • Research & Technical Content
          • Research Result Summaries
          • Reference Information
            • Thermo-Mechanical Bending(TMB) Rig
            • Mechanical Parameter Testing
            • Mechanical Bending Rig
            • Retrofit Cable Joint Mechanical Rig
          • Videos
      • Extruded Dielectric Cable Systems
        • Project Overview
        • Updates & Events
        • Research & Technical Content
          • Research Result Summaries
          • Reference Information
            • Thermo-Mechanical Bending(TMB) Rig
            • Mechanical Parameter Testing
            • Mechanical Bending Rig
          • Videos
      • Laminar Dielectric Cable Systems
        • Project Overview
        • Updates & Events
        • Research & Technical Content
          • Research Result Summaries
          • Reference Information
            • Buried Pipe Test Station
            • Mechanical Bending Rig
          • Videos
      • Principles and Practices of Underground Transmission
        • Project Overview
        • Updates & Events
        • Research & Technical Content
          • Research Result Summaries
          • Reference Information
          • Videos
      • HVDC Cable and HVAC Submarine Cable Systems
        • Project Overview
        • Updates & Events
        • Research & Technical Content
          • Research Result Summaries
          • Reference Information
            • Thermo-Mechanical Bending(TMB) Rig
            • Mechanical Parameter Testing
            • Mechanical Bending Rig
          • Videos
      • Contacts
    • Substations
      • 2026 Planned Research
        • P37.101: Transformer Life Management
        • P37.102: Circuit Breaker Life Management
        • P37.103: Protection and Control
        • P37.104: Substation Corrosion Management
        • P37.105: Balance of Substations: Batteries, Arresters and Ratings
        • P37.108: Gas Insulated Substations and Lines
        • P37.113: Polymer Bushing Life Management
        • P37.114: Substation Physical Security
        • P37.116: HVDC Converter Stations and Flexible Alternating Current Transmission System (FACTS) Devices
        • P37.117: Using Voltage and Current Measurements for Monitoring Asset Conditions
      • Transformer Life Management
        • Project Overview
        • Updates & Events
        • Research & Technical Content
          • Copper Book Technical Series
          • Latest monitor evaluation research results
      • Circuit Breaker Life Management
        • Project Overview
        • Updates & Events
        • Research & Technical Content
          • Novel SF6 Leak Sealing Techniques
            • Adhesive Vent Pipe
              • Field Trials
              • Application Guides
            • Tape & Putty
              • Field Trials
              • Application Guides
            • Metal Patch & Adapter
              • Field Trials
              • Application Guides
          • Circuit Breaker Reference Guide
            • Introduction
            • Fundamentals
            • Diagnostic testing
            • Investigating Problems and Failures
            • Lubrication
            • Pump and Compressor Maintenance
            • Evaluation of Cleaners for SF6 Interrupters
            • Specifications and Procurement
            • Installation
            • Continuing Development
          • Circuit Breaker Lubrication
          • Circuit Breaker Pump and Compressor Maintenance
      • Protection & Control
        • Project Overview
        • Updates & Events
        • Research & Technical Content
          • EPRI Testbed System for Simulating Power Swings
      • Substation Corrosion Management
        • Project Overview
        • Updates & Events
        • Research & Technical Content
          • Coating System Selection and Application: Case Study Update
          • Corrosion Behavior of Sub-Grade Mechanical Fasteners
          • Substation H-Frame Inspection Report
          • Cathodic Protection and the Effects of Stray Current
          • Substation Ground Grid Corrosion Study 1
          • Substation Ground Grid Corrosion Study 2
          • Corrosion Monitoring System
          • Subgrade Corrosion Map Update
      • Balance of Substations: Batteries, Arresters and Ratings
        • Project Overview
        • Updates & Events
        • Research & Technical Content
          • Arresters
          • Batteries
          • Robots and Drones
            • Functional Specifications for a Substation Robot
            • Test Plan for evaluating substation robots
          • Station Ratings and Asset Life Extension
          • Calculators
            • Switch Ratings
            • Wave Trap Ratings
      • Gas Insulated Substations and Lines
        • Project Overview
        • Updates & Events
        • Research & Technical Content
          • SF6 Leak detection
          • SF6 Alternatives
          • Guidebook Development
      • Polymer Bushing Life Management
        • Project Overview
        • Updates & Events
        • Research & Technical Content
      • Physical Security
        • Project Overview
        • Updates & Events
        • Research & Technical Content
          • Reference Information
            • Drone Detection Testing in Lenox
          • Research Result Summaries
          • Videos
      • Using Voltage and Current Measurements for Monitoring Asset Conditions
        • Project Overview
        • Updates & Events
        • Research & Technical Content
          • CCVT Asset Health Testing Setup and Results
          • Transformer Asset Health Testing Setup and Results
      • Robotics
        • 3D Scanning Technologies: Substation Applications
          • Project Overview
          • Updates & Events
          • Research Technical Content
        • Drone Dock
          • Project Overview
          • Updates & Events
          • Research & Technical Content
        • Robotics Utility Network (RUN)
          • Project Overview
          • Updates & Events
        • Unmanned Mobile Technologies Collaboration Group
          • Project Overview
          • Updates & Events
        • Substation Robotics Application
          • Project Overview
          • Updates & Events
          • Research & Technical Content
            • Evaluation of Substation Inspection Robotics Platform in Lenox – Test Plan
            • Substation Autonomous Robot Vendor Evaluation - Update Videos
            • Substation Robotics Sensor Test Plan
        • Substation Robot Analytics
          • Project Overview
          • Updates & Events
          • Research & Technical Content
            • Functional Specifications for an Autonomous Substation Robot Analytics Software
            • Evaluation of Substation Robotics Analytical Platform in Lenox - Test Plan
            • Substation Autonomous Robot Vendor Evaluation - Update Videos
      • Safety and Security
        • Physical Security and Counter-UAS
          • Project Overview
          • Updates & Events
          • Research & Technical Content
        • Safety by Design
          • Project Overview
          • Updates & Events
          • Research & Technical Content
        • Switching, Safety & Reliability
          • Project Overview
          • Updates & Events
          • Research & Technical Content
        • Transmission and Substations Safety Interest Group (TSIG)
          • Project Overview
          • Updates & Events
      • Supplemental Projects
      • Contacts
      • Historical Deliverables
    • GET SET
      • Affinity Group
        • Terms of Reference
        • Participants
        • Events & News
      • News
      • Planned Meetings
      • Technical Leads
    • High Voltage Direct Current (HVDC)
      • HVDC Overhead Transmission
        • Project Overview
        • Updates & Events
        • Research & Technical Content
          • HVDC Corrosion Research Questions and Objectives
          • HVDC Line Performance
          • HVDC Voltage Detector Testing
      • HVDC Converter Stations and FACTS Technologies
        • Project Overview
        • Updates & Events
        • Research & Technical Content
          • Research Result Summaries
          • Reference Information
    • EPRI U for Transmission
      • How to Get Engaged with EU4T
      • Project Updates, News, and FAQs
      • Hyperlinks to Training Courses
      • Contacts
    • EPRI Transmission Sector Council (TSC)
    • Resources
      • Applications
      • Capabilities
      • Technical Leads
      • White Papers
      • Area Information Documents
      • Success Stories
        • Substation Success Stories
      • Technology Radar Map
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