11kV Motor with 6.6kV VFD – Star Delta Solution

Application: Condensation Extraction Pump (CEP) in Super Critical Thermal Power Plant

Application:Condensation Extraction Pump (CEP) in Super Critical Thermal Power Plant.
Project Scope:EPC Project of Civil, Mechanical, Electrical and Instrumentation.
CustomerOne of the largest Integrated Greenfield Power Project in India.

One of the largest Integrated Greenfield Power Project in India. This is one of the first few Supercritical plants being constructed in the India. The Supercritical technologies are environment friendly and energy efficient technologies.


  • Reducing auxiliary power consumption and reducing carbon footprints.
  • Space for adding any new equipment/solution.
  • Ensuring reliability of 11kV old existing motors (China Make).
  • Pilot project of CEP retrofit using MV VFDs in India in Super Critical Thermal Plant.


For meeting the site challenges, a detailed feasibility has been conducted. It was an effort of more than 5-6 years for getting the feasibility approved and order has been placed with proposed solution.

Solution implemented with following:

  • It was an EPC project with total ownership of Ethan Power from feasibility, implementation, proven performance guarantee parameters to site handover.
  • Solution offered with a 6.6kv HT VFD with External Transformer for 11kV motor offering maximum benefits of energy efficiency of the solution.
  • Motor reconnected using Star-Delta Changeover for meeting the VFD mode as well as DOL mode of operation offering very relaxed operation for motor insulation. However, this depends upon motor condition/technical parameters but for this case star-delta was the optimum solution for ensuring long term life of motor.
  • A poof room solution with fire rated specs has been designed to meet the site requirement.
  • A skilled team has ensured no safety incident during entire execution.

Maximum benefits of energy efficiency have been achieved and auxiliary power consumption of plant has been reduced substantially.Complete project has been successfully handed over with contractual timelines. We have also secured a repeat order from this customer.

For further details, please get in touch with us.



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