Learn How to Depict Switchgear and Substation Single-Line Diagrams

Learn how to depict single-line, three-line diagrams and graphic electrical components that figure on them. Learn switchgear and substation elements like a circuit breaker, isolator, earth-switch, power transformer, CTs/VTs, arrestor, etc. 16 lessons in 3h 37 minutes total course length.

Course Description

This course will teach you single-line and three-line diagrams, their differences and graphic electrical components that figure on them. You will learn various elements that represent equipment like a circuit breaker, isolator, earth switch, power transformer, voltage and current transformer, lightning arrestor, auxiliary transformer, etc.

You will also learn important switchgear parts like busbar system, mimic, control cubicle, cable compartment, local/remote control, interlocking (isolator/circuit breaker, isolator/earth switch, busbar isolator/busbar earth-switch), etc.

The course continues with explaining incoming and outgoing feeder philosophy and some switchgear theory like continuous and short-circuit rating of the equipment, ANSI codes, current transformer polarity, etc.

Finally, we will review the ACDB single-line diagram with interlocking, and 132/11kV single-bus and double-bus single-breaker scheme SLD, as well as relay and metering SLD.

The one-line diagram is most commonly used in power flow studies. Standardized schematic symbols are used to depict electrical elements such as circuit breakers, transformers, capacitors, bus bars, and conductors. Only one conductor is displayed, rather than each of the three phases being represented by a distinct line or terminal.

When starting a new project or defining the scope of work, the single line diagram is the most critical document to consider and produce. In addition, a one-line diagram is necessary when preparing a shutdown/maintenance procedure statement.

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:

  1. The essentials of AC and DC power distribution systems for students (PDF)
  2. Design of 33kV switchyard (equipment, SLD, and layout) for small hydro-power plant (PDF)
  3. Design overview and analysis of 11/0.415 kV, 500 kVA power substation in Nigeria (PDF)
  4. Practical training report on 220/66/11 kV substation (PDF)
  5. Substation single bus scheme with bus section circuit breakers and interlockings (PDF)
  6. Technical specification for construction of 33/11 kV 2×31.5 MVA power substations (PDF)
  7. Training report on 400/220/132 kV switchyard in India: Design and engineering (PDF)
  8. Current and voltage measurements using Rogowski coil in MV air-insulated switchgear (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

  • 24 Lessons
  • Course Certificate
  • Lifetime Access