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Transient Overvoltage and Lightning Protection

One-Day Training Seminar

Course Summary
Physical lightning protection, a high-integrity single-point grounding system, and appropriate surge protection are the most effective means of assuring minimum risk exposure to transient overvoltage events--whether caused by load switching, lightning, or other EMP sources. This one-day course discusses these threats and the industry best practices to defend against them.

Who Should Attend?
This seminar is designed for the engineer, technician, electrician, or facility manager—anyone seeking to protect AC or DC power systems and critical equipment against disruption and damage.

A prerequisite for attendance is a basic knowledge of electrical theory including Ohm’s Law.

What to Expect
The class meets from 8 am to 5 pm. Each student will receive a course manual that includes the figures, tables and graphs discussed during the presentation.

Additional Training
Upon request, a second day of hands-on Site Inspection Training for private groups may be added at a discount following this course. Site Inspection Training takes place at a client facility, where students will learn the principles and techniques to identify deficiencies in a site’s electrical, grounding, and protection systems including visual inspection and using various field measurement instruments.

Accredited for 0.8 Continuing Education Units.


Section 1: Lightning

  • General Facts
  • Formation of lightning
  • Positive versus Negative Discharge
  • Hot versus Cold lightning
  • Parameters of the Lightning Stroke
  • Electric Field Effects
  • Electromagnetic pulse

Section 2: Switching Surges

  • Terminology
  • Unipolar and Bipolar Transients
  • Unidirectional and Bidirectiona Transientsl
  • Switching of Capacitive Circuits
  • Switching of Inductive Circuits
  • Representative Magnitudes of Switching Circuits

Section 3: Physical Lightning Protection

  • Static and Shield Wires
  • Protection of Transmission and Distribution Systems
  • Facility Direct Stroke Protection
  • Types of Systems
  • Air Terminals
  • Coursing and Down Conductors
  • High Frequency Considerations
  • Lightning Ground Impedance
  • Bonding Requirements
  • Rolling Sphere Modeling
  • Tower Grounding and Protection

Section 4: Grounding of Electrical Distributions

  • Earth Ground Electrode Systems
  • Grounding Electrode Conductor Sizing and Bonding
  • Resistivity, Resistance and Continuity Testing
  • Single Point Grounding of AC and DC Distributions
  • Equipment Grounding Conductors
  • Master Ground Bars and Bulkhead Entry Panels
  • Isolated Ground Systems
  • Halo Ground Systems
  • Grounding of Line Treatment Devices

Section 5: Power Line Transient Overvoltage Protection

  • Types of Protection
  • IC Sensitivity to and Effects of Voltage Stress
  • Standard Testing Waveforms
  • Power Line Monitoring
  • SPD Selection Criteria
  • Performance Characteristics
  • Suppression Technologies
  • Failure Modes
  • Application

Section 6: Data and Transmission Line Surge Protection

  • Data Cable Shield Grounding
  • Coaxial Cable Grounding
  • Dial-up Telephone Line Surge Protection
  • Leased Telephone Line Surge Protection
  • Ethernet/LAN Line Surge Protection
  • RS 232 Line Surge Protection
  • Coaxial Transmission Line Surge Protection
  • Protecting Data Lines against EMP

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