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3T - Introduction to Motor Starting Analysis

3 Technical Hours
3T - Introduction to Motor Starting Analysis is available for purchase in increments of 1



Title: Introduction to Motor Starting Analysis


Contact Hours: 3 Hours Technical

Language: English

Format: Lecture (No Video)



The starting current of most AC motors is several times normal full load current. Both synchronous and induction motors can draw five to ten times full load current when starting them across the line. Motor-starting torque varies directly as the square of the applied voltage. If the terminal voltage drop is excessive, the motor may not have enough starting torque to accelerate up to running speed. Running motors may stall from excessive voltage drops, or under-voltage relays may operate. In addition, if the motors are started frequently, the voltage dip at the source may cause objectionable flicker in the lighting system.

By using motor-starting study techniques, these problems can be predicted before the installation of the motor. If a starting device is needed, its characteristics and ratings can be easily determined. A typical digital computer program will calculate speed, slip, electrical output torque, load current, and terminal voltage data at discrete time intervals from locked rotor to full load speed. Also, voltage at important locations throughout the system during start-up can be monitored. The study can help select the best method of starting, the proper motor design, or the required system design for minimizing the impact of motor starting on the entire system. 

The material in this course is presented with numerous diagrams, waveforms to help students understand how large motors are started in large industrial systems. 


In Introduction to Motor Starting Analysis course, you'll learn...

  • Basic theory behind Motor Starting Analyses
  • How starting and stopping large motors can affect industrial system performance
  • Motor starting techniques
  • Commercial software modelling techniques, simulation performance and interpretation of the results 


About The Author 

Velimir started his professional career in the Electrical Engineering Institute "Nikola Tesla" Belgrade as Project Engineer working on various distribution system planning projects. He moved to Middle East where he is involved in analysis and planning of the EHV and MV transmission and distribution networks as well as conceptual and detailed design, installation and commissioning of substations for major consultancies and local utility companies. He also got significant experience working for the major oil companies solving their complex operational issues helping them to improve overall production.

He modelled various phenomena in the power systems including steady state, dynamic, harmonic and fast transient responses. He has good knowledge in substation design, HV cable sizing and installation and earthing system design. He understands how projects are successfully managed throughout complete cycle. He has profound knowledge of power system modelling and analysis software tools, CAD design and GIS systems.     

He has rich experience working on projects in UK, Qatar, United Arab Emirates, Malaysia, Bahrain and Serbia. Velimir authored several technical papers that were published in IEEE proceedings. He is a member of IEEE Power Society and CIGRE.

He runs and operates Gridtect (www.gridtect.com) and can be reached via info@gridtect.com