AC Efect On Pipeline
AC Efect On Pipeline
AC Efect On Pipeline
Interference
AC INTERFERENCE
EFFECTS
PIPELINES & HIGH VOLTAGE POWER
LINES
A RIGHT-OF-WAY PERSPECTIVE
By
Robert F. Allen
Introduction
Safety issues
Introduction
Overview
What is AC Interference?
Electrical Energy flow from Electric power
lines to nearby metallic structures
What Is AC Interference?
Electromagnetic Fields
Fault conditions
Key Words
AC Electrical Interference
Electromagnetic (Inductive) Coupling
Electrostatic (Capacitive) Coupling
Conductive Coupling
Local Earth
Remote Earth
Steady-state
Fault Condition
Key Factors
Possible Effects
Shocks to personnel
Accelerated corrosion
Damage to electronic equipment
Arcing across insulators or through coating
Degradation of coating
Perforation of the structure
Ignition of volatile liquids
Interference Mechanisms
3 Modes of Electromagnetic
Interference
Conductive Coupling
Electrostatic Coupling
Electrostatic Coupling
Mitigation Techniques
Electromagnetic Coupling
Electromagnetic Coupling
Mitigation Techniques
Conductive Coupling
Conductive Coupling
Mitigation Techniques
Peak Values
Discontinuities
Rapid changes in direction
Termination of either structure
Insulating junction - Double stress voltage
Change in structure characteristics
Transposition of AC line phases
Interference Analysis
Personnel Hazards
Structure grounding
Safety Issues
Mitigation Methods
DC Isolation
AC Isolation
Structure Foundations
Grounding
Counterpoise
Power System
Disturbances
Grounding Techniques
Nature of Earth
Electrode
How does it work?
Electrical Safety
Shock Mechanisms,
& Guidelines
Abnormal Conditions
- Lightning Strokes
- Line-to-Ground Faults
Grounding System
A grounding system should provide a safe path
for dissipation of the following:
Fault Currents
Lightning Strokes
Static Charges
Grounding System
A good grounding system will:
Mitigation Objectives
Mitigation Methods
Relocate pipeline
Lumped grounding or Brute Force Method
Cancellation wires
Gradient control wires
Gradient control grids
Isolator/Surge Protector - DC
Mitigation Design
Other Issues
Casings
Recommended
Practices
Conclusion
AC & DC Electrical
Interference