HV Electrical Course

Lesson 1 • HV System Classifications and Ranges

Defines HV, extra-high voltage, and ultra-high voltage thresholds per international standards. Enables students to categorise equipment and apply correct safety protocols.

Lesson 2 • Electrical Theory Review for HV

Covers voltage, current, resistance, and power relationships at high voltage levels. Establishes the theoretical baseline required for all subsequent HV topics.

Lesson 3 • Electrical Fields and Insulation Basics

Explains electric field distribution and dielectric behaviour in HV environments. Connects field theory to insulation selection and equipment design.

Lesson 1 • HV Hazard Identification

Identifies electrical, arc flash, and induced voltage hazards present in HV work zones. Forms the risk-awareness foundation for all practical HV tasks.

Lesson 2 • Emergency Response for HV Incidents

Trains response to electric shock, arc flash burns, and HV fire scenarios. Integrates emergency procedures with site safety plans.

Lesson 3 • Lockout/Tagout and Isolation Procedures

Covers energy isolation, lockout/tagout application, and verification of de-energisation. Directly prevents accidental re-energisation during HV maintenance.

Lesson 4 • Personal Protective Equipment for HV

Details PPE selection, ratings, and inspection procedures for HV electrical work. Ensures students choose and use correct protection for each voltage class.

Lesson 1 • Instrument Transformers: CTs and VTs

Explains current transformer and voltage transformer construction, accuracy classes, and burdens. Links instrument transformer performance to protection relay accuracy.

Lesson 2 • Disconnectors and Earthing Switches

Covers the role of disconnectors and earthing switches in isolating HV equipment safely. Distinguishes their function from circuit breakers in switching sequences.

Lesson 3 • Circuit Breakers in HV Systems

Examines SF6, vacuum, and air-blast circuit breaker technologies and their operating principles. Provides the basis for understanding fault interruption in HV networks.

Lesson 4 • Protection Coordination and Selectivity

Applies time-current grading and zone coordination to ensure selective fault clearance. Students can evaluate and adjust protection schemes for HV networks.

Lesson 1 • On-Load Tap Changers and Voltage Control

Covers OLTC mechanism, control logic, and maintenance requirements for voltage regulation. Links tap changer operation to system voltage stability.

Lesson 2 • Transformer Vector Groups and Connections

Explains delta, star, and zigzag winding connections and their vector group designations. Prepares students to parallel transformers and analyse zero-sequence current paths.

Lesson 3 • Transformer Protection and Monitoring

Addresses Buchholz relay, differential protection, and thermal monitoring for HV transformers. Integrates protection devices with transformer condition assessment.

Lesson 4 • Transformer Equivalent Circuit and Parameters

Develops the equivalent circuit model and derives key parameters from open- and short-circuit tests. Enables performance prediction under load and fault conditions.

Lesson 1 • HV Cable Construction and Selection

Reviews XLPE, EPR, and fluid-filled cable constructions and selection criteria for HV projects. Provides the technical basis for specifying cables in design and procurement.

Lesson 2 • HV Cable Acceptance and Diagnostic Testing

Applies VLF withstand, partial discharge, and tan-delta testing to verify cable system integrity. Interprets test results to accept or reject installed cable systems.

Lesson 3 • Cable Installation Methods and Practices

Covers trenching, duct installation, pulling tension limits, and bending radius requirements. Ensures cables are installed without mechanical damage or insulation stress.

Lesson 4 • HV Cable Terminations

Details indoor and outdoor termination assembly, creepage requirements, and sealing methods. Connects termination quality to long-term cable system reliability.

Lesson 1 • Surge Arresters and Overvoltage Protection

Explains metal oxide surge arrester operation and placement for transient overvoltage protection. Links arrester characteristics to insulation coordination of substation equipment.

Lesson 2 • Substation Control and SCADA Integration

Introduces substation automation, IED communication, and SCADA connectivity for HV substations. Prepares students to understand modern digital substation architectures.

Lesson 3 • Substation Types and Bus Configurations

Compares AIS, GIS, and hybrid substations and evaluates single, double, and ring bus arrangements. Connects bus configuration choice to reliability and maintenance flexibility.

Lesson 4 • DC Auxiliary and Battery Systems

Covers substation DC supply, battery sizing, and charger design for protection and control loads. Ensures students understand the critical role of DC systems in substation reliability.

Lesson 1 • Fault Location and System Restoration

Uses impedance-based and travelling-wave methods to locate faults and restore HV system supply. Integrates fault location with switching procedures and restoration planning.

Lesson 2 • Power System Stability Concepts

Explains transient, voltage, and frequency stability and their impact on HV system operation. Connects stability concepts to protection relay settings and system design.

Lesson 3 • Symmetrical Components Theory

Introduces positive, negative, and zero sequence networks for unbalanced fault analysis. Provides the mathematical framework used in all subsequent fault calculation work.

Lesson 4 • HV Equipment Diagnostic Techniques

Applies insulation resistance, power factor, and dissolved gas analysis to assess HV equipment health. Enables condition-based maintenance decisions for transformers and switchgear.

Lesson 1 • Preventive Maintenance Programmes

Designs time-based and condition-based maintenance schedules for HV transformers, switchgear, and cables. Reduces unplanned outages through systematic inspection and servicing.

Lesson 2 • HV Energisation Procedures

Executes step-by-step energisation sequences for transformers, cables, and switchgear safely. Applies switching authority and communication protocols during live energisation.

Lesson 3 • Asset Management and Life Extension

Applies condition assessment data to prioritise HV asset replacement and refurbishment decisions. Connects maintenance outcomes to long-term capital planning and risk management.

Lesson 4 • Commissioning Planning and Documentation

Develops commissioning plans, test schedules, and acceptance criteria for HV installations. Establishes the documentation framework that governs all commissioning activities.