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Earthing Design Calculation, Lightning Protection System
Rating: 3.7 out of 5(54 ratings)
323 students

Earthing Design Calculation, Lightning Protection System

Risk Assessment Analysis, Lightning Protection Design, Calculation and Layout.
Created byRajendra Singh
Last updated 4/2025
English
English [Auto],

What you'll learn

  • Earthing Design Calculation and Layout
  • Grounding System Design
  • Lightning Protection Design and Calculation
  • Lighting Protection Layout
  • Risk Assessment

Course content

4 sections47 lectures4h 1m total length
  • What is Grounding2:09
  • Codes & Standards2:43
  • Objective of Grounding2:21

    In this lecture you will learn.


    • System Failures on industrial power system

    • What is ground faults?

    • Types of faults

    • Ungrounded System

    • Ground Faults

    • Arching ground faults

    • Bolted ground faults

  • Functions of Earthing4:28

    In this lecture you will learn


    • Arching ground faults

    • Hazards with grounded

    • Resistance grounding

  • Types of Grounding0:53
  • System Grounding25:54

    In this lecture you will learn


    • Separate Grounding Resistors

    • Benefits of Grounding

  • Equipment Grounding4:26
  • Grounding Calculation Methodology14:45
  • System Failures on Industrial Power Systems1:09

    Identify major causes of industrial power system failures, showing line-to-ground faults at about 98% and earth faults at about 90%, and emphasize earthing to isolate healthy from faulty parts.

  • What is a Ground Fault1:48

    Understand how a ground fault occurs in a star-connected system when an overloaded conductor contacts earth, causing near-zero impedance and massive fault current that threatens equipment and touch voltage.

  • Definitions1:36
  • Types of Faults1:48

    Identify and contrast voltage faults and arc faults in power systems, including bolted faults and media in arcing, highlighting the extreme energy and damage of arc faults.

  • Grounding Definition2:05
  • Ungrounded Systems2:40
  • Industry Recommendations1:49
  • Ground Faults2:33

    Analyze ground fault distribution in a delta system, the circulating current, and how high frequency oscillations and loop impedance influence earth fault protection.

  • Solidly Grounded Systems1:37
  • IEEE - Arching Faults1:53
  • Bolted Ground Faults2:58

    Analyze bolted ground faults in a solidly grounded star system and show fault current distribution back to the neutral using full-load current and impedance, including ECB and ICC.

  • Arcing Ground Faults2:12
  • Hazards with Ungrounded - Solidly Grounded2:36

    Compare ungrounded and solidly grounded systems to reveal hazards, noting that ungrounded setups face large transient overvoltages that threaten insulation and personnel, while solidly grounded systems enable fast fault isolation.

  • Resistance Grounding6:45

    Understand low and high resistance grounding in earthing design: low resistance limits fault current and arc hazards, while high resistance maintains service after faults, with considerations for ratings and ventilation.

  • What if no neutral exists1:07
  • System Capacitance and Fault Location3:52
  • Grounding - Hazard3:55

    Explain elevated voltage hazards in a high-resistance grounded, star-configured system, and show how properly rated equipment, ground-fault relays, and sensing resistors protect against arc and short-circuit faults.

  • Generator Grounding - IEEE2:40
  • Solidly, Resistance, Hybrid, Paralleled Generators and Separate Grounding2:46

    Explore solidly grounded systems for three-phase four-wire networks, including resistance, hybrid, and separate grounding to control fault current, capacitive charging, and parallel generator coordination.

  • Benefits of Grounding1:05
  • Equipment Grounding Requirements3:02

Requirements

  • Passion to learn
  • Laptop / PC with Internet
  • MS Excel

Description

What is Earthing or Grounding?

A safety measure devised to prevent people from getting shocked if the insulation inside electrical devices fails is called Earthing. To answer our initial question, the third pin in the plug is actually the “Earth” or “Ground” connection of the electrical appliance.

The Earth, being a good conductor of electricity, acts as a convenient path for the flow of electrons that escape the insulation. Furthermore, the gigantic size of the Earth paves a path for the safe discharge of the electric charge.

In technical terms, Electrical Earthing can be defined as the process of transferring the immediate discharge of the electrical energy directly to the Earth with the help of the low-resistance wire. The electrical earthing is carried out by connecting the non-current-carrying part of the equipment or the neutral part of the supply system to the ground.

As stated earlier, earthing provides a simple path for the leakage current i.e., the current that escapes from a device if there’s any fault in the insulation. The short circuit current (current that follows the path of least resistance) of the equipment passes to the Earth, which has zero potential, thus protecting the system and equipment from damage.


Why is earthing necessary?

  • Human Safety

  • Safety of Electrical Equipment

  • Protection of Buildings from Lightning

Types of Earthing methods

  • Plate earthing

  • Pipe earthing

  • Rod earthing

  • Water main method

What is a lightning protection system?

Lightning protection systems are used to prevent or lessen lightning strike damage to buildings. They protect the internal electrical components of a building, helping to prevent fires or electrocution. Lightning protection comes in the form of a lightning conductor, usually a metal rod, mounted on a building to protect it from lightning strikes. The system will intercept a strike so if lightning hits the building, the lightning rod will be hit first, causing the strike to be conducted through a wire, and passing through to the ground safely.

In a lightning protection system, the lightning rod is a single component of the system. The lightning rod requires a connection to earth to give a building protection. Lightning rods come in many different forms, including hollow, solid, pointed or rounded. All lightning rods are made of conductive materials, such as copper and aluminum.

Because of the high energy and current levels associated with lightning a lightning protection system can never guarantee complete safety from the effects of lightning. In a lightning protection system, the current will divide to follow every conductive path to ground but even the divided current can cause damage. These secondary “side-flashes” can still cause a fire, blow apart brick, stone, or concrete, or injure anyone within a building.


Who this course is for:

  • Electrical Engineer
  • Electronics Engineer
  • Instrumentation Engineer