Application of Variable Speed Drives and Rotating Machines

Theory and Calculations

• Three phase theory and calculations
• Newton’s second law of motion
• Single phase and three phase rectifiers

Electrical Machines and Transformer Reactances

• Synchronous machines and reactances
• Asynchronous machines and insulation systems
• Types of driven equipment and their torque demand curves
• Asynchronous machine performance and calculations

Introduction to Power Electronics

• Types of electronic switches
• Performance of IGCTs, IGBTs, Mosfets, gate turn off thyristors, transistors, thyristors
• Characteristics and losses of main types
• Variable outputs from AC and DC circuits
• Commutation and PWM switching
• Star modulation and assembly of rotating vectors
• Direct torque control by flux vector resolution

Application of AC Variable Speed Drives

• Overview and application examples
• Safe working on HV drive systems
• Options and types of available drives
• Dimensioning of drives
• Selection of motor and converter
• Satisfying torque speed curves

Interface with Utility Companies

• Switchgear ratings and short circuit levels
• Interconnection to utility power systems
• Demonstration of power system analysis programme
• Short circuit levels and total harmonic distortion
• Measurement of harmonics

Harmonics and Solutions

• Harmonics and reduction methods
• Transformer connections
• Active filters

Specification of AC Variable Speed Drive Systems

• Specifications and data sheets
• ATEX (hazardous areas with VSDs)
• Specification and sizing of transformers and cables
• ‘K’ ratings of transformers
• Motor voltage transients and VSDs
• Typical applications, problems to solve and critical limits
• EMC and cables

Installation and Commissioning

• Diagnostic and troubleshooting
• Pitfalls and problems
• Motor voltage transients and VSDs
• Ventilation of converters and motors
• Bearings
• Safety precautions when testing

Programme may be subject to amendment.