Medium Voltage Electrician Course

Lesson 1 • Electrical Power and Energy

Teaches real, reactive, and apparent power and their measurement. Enables accurate load analysis required for MV system design and maintenance.

Lesson 2 • Three-Phase System Basics

Introduces balanced three-phase generation and distribution concepts. Prepares students for MV switchgear and transformer work in later chapters.

Lesson 3 • AC Power Principles

Explains alternating current waveforms, frequency, and phase relationships. Directly applicable to three-phase MV distribution systems studied later.

Lesson 1 • Power Flow and Load Analysis

Explains how power flows from source to load and how demand affects system voltage. Introduces load flow concepts used in MV system planning.

Lesson 2 • MV Distribution Network Architecture

Describes radial, loop, and network distribution topologies used in MV systems. Students learn to read single-line diagrams representing these configurations.

Lesson 3 • Defining Medium Voltage Range

Establishes the voltage range classified as medium voltage and its industrial applications. Distinguishes MV from low-voltage and high-voltage systems.

Lesson 1 • Work Permits and Safety Documentation

Explains energized work permits, job hazard analyses, and safety briefings for MV tasks. Connects documentation requirements to regulatory compliance.

Lesson 2 • Personal Protective Equipment for MV

Specifies arc-rated clothing, insulating gloves, and face protection required at MV levels. Students select correct PPE based on incident energy analysis.

Lesson 3 • Lockout/Tagout for MV Systems

Covers the full energy control procedure for de-energizing MV equipment safely. Emphasizes verification steps unique to medium voltage levels.

Lesson 4 • Electrical Hazard Recognition

Identifies shock, arc flash, and arc blast hazards specific to MV environments. Hazard recognition is the prerequisite for all protective measures covered next.

Lesson 1 • Transformer Testing Procedures

Teaches insulation resistance, turns ratio, and power factor testing for MV transformers. Students interpret results against acceptance criteria to assess transformer health.

Lesson 2 • Transformer Construction and Operation

Explains core, winding, and insulation systems in oil-filled and dry-type MV transformers. Provides the physical basis for all maintenance and testing tasks.

Lesson 3 • Transformer Maintenance and Troubleshooting

Details oil sampling, cooling system checks, and bushing inspection routines. Students diagnose common faults including overheating, moisture ingress, and winding failure.

Lesson 1 • Fuses and Disconnect Switches

Covers MV fuse types, current-limiting characteristics, and disconnect switch operation. Students select and replace fuses and operate disconnects safely.

Lesson 2 • Switchgear Maintenance and Testing

Details contact resistance, insulation, and timing tests for MV circuit breakers. Students perform and document maintenance tasks to manufacturer and industry standards.

Lesson 3 • Switchgear Control and Interlocking

Covers control wiring, closing and tripping circuits, and mechanical interlocks in MV switchgear. Students trace control circuits and verify interlock function.

Lesson 4 • Switchgear Types and Configurations

Compares metal-clad, metal-enclosed, and pad-mounted switchgear used in MV systems. Students identify appropriate switchgear for given application requirements.

Lesson 1 • Cable Termination Methods

Details indoor and outdoor MV termination construction for stress control. Proper terminations prevent corona and tracking at cable ends.

Lesson 2 • Cable Splicing Techniques

Teaches heat-shrink, cold-shrink, and tape splice methods for MV cables. Students build splices that restore full electrical and mechanical integrity.

Lesson 3 • MV Cable Construction and Types

Explains conductor, insulation, shielding, and jacket systems in MV cables. Cable construction knowledge drives correct selection, handling, and testing decisions.

Lesson 4 • MV Cable Installation Practices

Covers pulling calculations, conduit fill, bending radius, and direct burial requirements. Correct installation prevents insulation damage that causes premature failures.

Lesson 1 • Differential and Distance Protection

Introduces transformer differential and line distance protection for MV applications. Students understand operating principles and basic commissioning checks.

Lesson 2 • Protection Coordination Studies

Teaches time-current curve plotting and selectivity analysis for MV feeder coordination. Students produce a coordination study that ensures selective fault isolation.

Lesson 3 • Overcurrent Protection Relays

Covers time-overcurrent, instantaneous, and directional overcurrent relay characteristics. Students calculate pickup and time-dial settings for feeder protection.

Lesson 4 • Ground Fault and Earth Protection

Explains residual, zero-sequence, and restricted earth fault protection schemes. Students apply ground fault protection to solidly and resistance-grounded MV systems.

Lesson 1 • Energization and Acceptance Testing

Guides step-by-step energization sequences and live acceptance tests for MV equipment. Students confirm voltage levels, phase rotation, and protection operation.

Lesson 2 • Repair, Restoration, and Lessons Learned

Covers repair verification, safe re-energization after faults, and post-incident review. Students document corrective actions and update maintenance records.

Lesson 3 • Pre-Energization Inspection and Testing

Details visual inspections, insulation tests, and control circuit checks before first energization. Students verify equipment readiness and document findings.

Lesson 4 • Systematic Fault Diagnosis

Applies structured diagnostic methods to locate and identify MV system faults. Students use symptom analysis, test data, and elimination to pinpoint root causes.