November 2021

AC Interference from High Voltage Transmission Lines on Nearby Pipelines and Railways

Status: 25 seats available
Date: Wednesday, November 24, 2021 - Friday, November 26, 2021
Time: 8:15 AM-8:30 AM Pacific Time: Registration and Login
8:30 AM-12:30 PM Pacific Time: Webinar
Location: Webinar
Presenter: Dr. Ali Moshref, P.Eng., SMIEEE
Partner, Principal Engineer, Power Systems and Testing, BBA Inc.
Dr. Hamed Ahmadi, P.Eng.
Senior Engineer, Transmission Lines Engineering, BC Hydro
Credit: Eligible for 12.0 CE Hour(s) of Technical Learning
Cost: Engineers and Geoscientists BC Registrant Early Bird Price: $800.00 + GST = $840.00 until Nov 10, 2021

Engineers and Geoscientists BC Registrant Regular Price: $900.00 + GST = $945.00

Non-Registrant Price: $900.00 + GST = $945.00

Student Price: $450.00 + GST = $472.50
Please Note:
  • Student Price is eligible for participants in Engineers and Geoscientists BC’s Student Program
  • If you are not an Engineers and Geoscientists BC registrant, and you do not already have an existing account, please proceed to creating a new account to create a profile before completing your event registration
  • For webinar sessions, the webinar login instructions will be made available 3 business days prior to the webinar date
  • A minimum number of registrations are needed by November 10, 2021 to proceed with this seminar. Please register early to avoid cancellation
  • All prices are subject to applicable taxes
Contact: Rachel Osterman | Professional Development Coordinator
Direct: 604.412.4897
Toll-Free 1.888.430.8035 ext. 4897
Email: [email protected]
This seminar covers issues related to AC electrical interferences that may take place between power lines and any nearby metallic structure such as buildings, pipelines, and railways.

High voltage transmission line structures and conductor arrangements, right-of-way (ROW), electric and magnetic fields, tower footing and counterpoise grounding, shield wires, short circuits, and ground potential rise will be covered. In addition, characteristics and structure of pipeline and railway facilities, related safety criteria imposed by national and international standards, and mechanism of interaction with transmission lines will be discussed in detail. The pipeline coating stress, current leakage density from a holiday, and induced voltage levels during steady-state and under fault conditions of power system will be described and practical examples will be demonstrated. Principle of arcing due to lightning strikes and subsequent ionization and breakdown of soil is explained along with the relevant mathematical formulations. Methods of mitigations of unacceptable interferences such as design and installation of ground mats, zinc/copper wires, solid-state de-couplers, and tower footing grounding improvements are discussed in detail.

Learning Objectives

  • Understand principles of interference between powerlines and adjacent facilities.
  • Know the applicable industry standards and design criteria.
  • Learn the analytical techniques used in AC interference studies.
  • Understand the concept of lightning-initiated arcing from transmission structures to nearby objects.
  • Become familiar with mitigation techniques.

Seminar Outline

Day 1

Part 1: AC Interference Basics

  • Course Outline
  • Introduction to the Topic
  • Power Transmission Lines

Part 2: Electric and Magnetic Fields

  • Magnetic Field Generated by Power Lines
  • Concept of Mutual Impedance
  • Simple Example
  • Electric Field Generated by Power Lines
  • Concept of Mutual Capacitance
  • Simple Example

Part 3: Grounding and Conduction Effects

  • Soil Resistivity (Measurements and Modelling)
  • Structure Grounding Resistance
  • Ground Faults in Power Systems
  • Ground Potential Rise
  • Step and Touch Potential
  • Review of International Standards
  • Simple Example

Day 2

Part 4: Characteristics of Pipelines and Railways

  • Pipelines
  • Characteristics: sizes, coatings, cathodic protection, well sites, risers, valves, tie-ins, etc.
  • Equivalent Circuit Model
  • Railways
  • Characteristics: ballast, signalling, joints
  • Equivalent Circuit Model
  • Simple Examples

Part 5: Pipeline AC Interference

  • Description of Case Study
  • Steady-State Induced Voltage Profile
  • Touch Potential Hazard
  • Holiday Leakage Current Density
  • Fault Induced Voltage Profiles
  • Touch Potential Hazard
  • Coating Stress
  • Mitigation Design
  • Pipeline Integrity
  • Worker Safety

Day 3

Part 6: Railway AC Interference

  • Description of Case Study
  • Steady-State Induced Voltage Profile
  • Touch Potential Hazard
  • Signalling
  • Fault Induced Voltage Profiles
  • Touch Potential Hazard
  • Equipment Damage
  • Mitigation Design

Part 7: Lightning Effects

  • Basics of Lightning
  • Soil Ionization Theory
  • Arc-to-Pipe

Who Should Attend?

Recent university graduates, practising electrical engineers, pipeline engineers, managers involved in the design, planning, and operation of power systems, and asset managers.


Practical seminar in which participants will learn about concepts of AC interference and the relevant mitigation practices in the industry and complete exercises using typical case scenarios.

  • Formal/informal presentation and discussion
  • Practical examples and exercises


Dr. Ali Moshref, P.Eng., SMIEEE

Partner, Principal Engineer, Power Systems and Testing, BBA Inc.

Dr. Moshref joined BBA in 2012 with over 39 years of power system experience in the energy industry, including power system planning, system operation, asset management, and alternate energy resources for power generation, and software development for the analysis of power systems. Previously at Powertech Labs, Dr. Moshref was the Power System Studies Manager and reported to the Smart Utility Business Unit Director. Dr. Moshref developed planning and operation strategies and policies for various utilities and industrial organizations. Early in his career, Dr. Moshref co-founded CYME International Inc., where he designed and developed more than 12 computer programs for power system analysis. Dr. Moshref is the recipient of numerous awards from McGill University in Montréal, Quebec, the IDA World Congress on Desalination and Water Sciences in Abu Dhabi, UAE, and the NSERC Industrial Fellowship, Natural Science and Engineering Research Council of Canada. Dr. Moshref is Senior Member of the Institute of Electrical and Electronics Engineers (SMIEEE), IEEE PES Distinguished Lecturer, Engineers and Geoscientists British Columbia (EGBC), Association of Professional Engineers and Geoscientists of Saskatchewan (APEGS), Canadian Mirror Committee to IEC TC114 for Marine Energy, Guide for Evaluating AC Interference on Linear Facilities Co-Located Near Transmission Lines, IEEE Standard P2746™, and a seasonal lecturer at the University of Victoria (UVic).

Hamed Ahmadi, PhD, P.Eng.

Senior Engineer, Transmission Lines Engineering, BC Hydro

Hamed received the B.Sc. and M.Sc. degrees in Electrical and Computer Engineering from the University of Tehran, Tehran, Iran, in 2009 and 2011, respectively. He received his PhD degree in Electrical and Computer Engineering from the University of British Columbia (UBC) in 2015. He is the recipient of several awards including Faculty of Applied Science Graduate Award and MITACS Accelerate Award in 2014 and 2015. Hamed has experiences in transmission planning, distribution planning, high voltage engineering, transmission line design, AC interference studies, and worker safety matters. Hamed joined BC Hydro in 2015, where he is currently a senior electrical engineer with the Transmission Lines Electrical Design Team. He is an adjunct professor at UBC where he has been an instructor for the Capstone Design Project course since 2017. Hamed is a registered professional engineer with Engineers and Geoscientists BC.

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