Distance Protection Course: Learn How Distance Relay Protects Line and How to Set It Correctly

The course is dedicated to a deep understanding of distance relay protection and correct setting calculations. Learn relay characteristic angle and fault characteristics through detailed explanations of impedance relays, Mho and offset Mho relay, etc. 45 lessons in over 5 hours.

Course Description

Distance protection is the simplest type of protection that is widely used in electrical power systems. All the high voltage and extra-high voltage lines are equipped with a Distance Protection relay. Distance relaying is the art and science of the protection system, and therefore it is essential to understand and learn the working principle of overcurrent relays.

The course consists of 46 lessons in 5 hours. Complex topics of protection relays are covered and explained with straightforward explanations and various examples.

The course starts with the distance protection concepts, relay characteristic angle and fault characteristics and continues with detailed explanations of plain and directional impedance relays, Mho and offset Mho relay. Special attention is paid to describing the working principle of Zone 1, 2 and 3 relay settings, and the distance protection settings network diagram.

Distance relaying should be considered when overcurrent relaying is too slow or is not selective. Distance relays are generally used for phase-fault primary and backup protection on sub-transmission lines. They are also used for the protection of transmission lines where high-speed automatic reclosing is not necessary to maintain stability and where the short-time delay for end-zone faults can be tolerated.

Overcurrent relays have been used generally for ground-fault primary and backup protection, but there is also a growing trend toward distance relays for ground faults.

Course Summary

  • Distance Protection Concepts
  • Relay Characteristic Angle and Fault Characteristics
  • Plain Impedance Relay
  • Directional Impedance Relay
  • Mho Relay
  • Offset Mho Relay
  • Zone 1, 2 and 3 Relay Settings
  • Distance Protection Settings Network Diagram


  • Basics of electrical concepts

Who Is This Course For

  • Practicing power system engineers
  • Substation engineers
  • Maintenance staff
  • Electrical engineering students planning on pursuing a career in power engineering
  • Power System Protection Engineers

Downloadable course materials

After purchasing the course, students can download the following documents:

  1. Distance relays fundamentals (PDF)
  2. Fundamentals of line protection with distance relays (PDF)
  3. Ground Fault Protection of Overhead Transmission Lines - Focus On Distance Relays (PDF)
  4. Testing And Commissioning Guideline For Numerical Distance Protection Relay (PDF)

About Instructor

Muhammad Kashif

Muhammad Kashif Shamshad is an Electrical Engineer and has more than 17 years of experience in operation & maintenance, erection, testing project management, consultancy, supervision, and commissioning of Power Plant, GIS, and AIS high voltage substations ranging up to 500 kV HVAC & ±660kV HVDC  more than 10 years experience is with Siemens Saudi Arabia. He completed over 20 high voltage substation projects, Operation & Maintenace of Substation & Power plants in Pakistan and Saudi Arabia for different electric utilities including Saudi Electricity Company (SEC), Saudi Aramco, SABIC, Marafiq, National Transmission & Despatch Company (NTDC), WAPDA, and K-Electric. Also, he led testing and commissioning teams to implement electrical infrastructure projects for many types of industrial clients (Steel, Petrochemical, etc.) in both countries, Pakistan and Saudi Arabia.

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Course Includes

  • 46 Lessons
  • Course Certificate
  • Lifetime Access