Learn to Read and Analyze Circuit Breaker Schematics and Control Wiring Diagrams

This is an intermediate to advance level course dedicated to schematics and control wiring diagrams of high-voltage and medium-voltage circuit breakers (applicable to power substations, switchyards, power plants, etc.). 39 lessons in 7h 14min total course length.

Coures Description

This is an intermediate to advance level course dedicated to schematics and control wiring diagrams of high-voltage and medium-voltage circuit breakers. The course starts with explaining circuit breaker cubicle schematics and control wiring diagrams and continues with discussing each circuit in detail.

Wiring diagrams (panel wiring diagrams, control wiring diagrams) provide a road map of the connections between circuit breakers and other devices (disconnectors, CTs, VTs, etc.) to facilitate assembly, debugging, and testing. It’s very important to fully understand every detail you can find on these schematics.

After completing this course, you will be able to easily read and analyse the control and protection schematics of any substation or power plant (GIS, LCC, Switchyard, etc.).

In this course we will discuss the following topics:

  1. Seal In Circuit
  2. Tripping and closing coil characteristics
  3. Tripping and closing coil save circuit
  4. Trip Command Duration and Resetting of Trip Command
  5. GIS Components
  6. Circuit breaker pumping action
  7. Anti Pumping Circuit and Relay
  8. What is Pole Discrepancy
  9. Pole Discrepancy Circuit and Relay
  10. Pole Discrepancy Relays Operation Philosphies
  11. Pole Discrepancy Vs Breaker Failure
  12. Circuit Breaker Failure
  13. Circuit Breaker Close Block Function
  14. Circuit Breaker Failure Relay Initiation Circuit
  15. Circuit Breaker Save Coil Feature
  16. Circuit Breaker Failure With Current and without current feature
  17. Busbar Protection Basic Functionality
  18. Gas Insulated Switchgear
  19. Gas Insulated Switchgear Single Line Diagram
  20. SF6 Lockout Circuit
  21. SF6 LockOut in Tripping Circuit
  1. Circuit Breaker Auxiliary Contacts
  2. Spring Auxiliary Contacts
  3. Circuit Breaker Counter and Its Circuit
  4. Spring Charge Mechanism Circuit
  5. Operation ranges for AC and DC Voltages of Switch Gear
  6. Operation Circuit for Three Position Switch
  7. Early Make Late Break Contacts Vs Normal contacts
  8. Current Transformer Circuit
  9. Voltage Transformer Circuit
  10. Circuit Breaker Interlocks and operation circuit
  11. Line Isolator Interlocking
  12. Line Isolator Interlock Circuit
  13. Busbar Isolator Interlocks and circuit
  14. Busbar Isolator Earth Switch, Line Isolator Switch and High-Speed Earth Switch
  15. Interlock of Busbar Earth Switch and VT three-position switch
  16. Intermidiate Position Alarm Circuit
  17. Discrepancy Switch Circuit
  18. Supply Supervision, Loop Supervision, MCB Trip Supervision

Who Is This Course For

  1. Practicing power system engineers
  2. Substation engineers
  3. Maintenance staff
  4. Electrical engineering students planning on pursuing a career in power engineering
  5. Power System Protection Engineers


  • Knowledge of basic electrical principles
  • A basic understanding of electrical engineering

Downloadable course materials

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

  1. HV Device Drawings:
    1. ZEBA01-SHVS-703849.pdf
    2. ZEBC01-SHVS-703849-A.pdf
    3. ZEBC02-SHVS-703849.pdf
    4. ZEBC03-SHVS-703849.pdf
    5. ZEBP01-SHVS-703849.pdf
    6. ZEBP02-SHVS-703849.pdf
    7. ZEQA01-SHVS-703849.pdf
    8. ZEQC31-SHVS-703849.pdf
    9. ZEQZ01-SHVS-703849.pdf
  2. LCC Drawings:
    1. =E00-SHVS-703849.pdf
    2. =E01-SHVS-703849.pdf
    3. =E02-SHVS-703849.pdf
    4. =E03-SHVS-703849.pdf
  3. The basics of power system protection that every engineer should know about.pdf
  4. A practical handbook for relay protection engineers.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.

15 Courses

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Course Includes

  • 40 Lessons
  • Course Certificate
  • Lifetime Access