• Skip to primary navigation
  • Skip to main content
  • Skip to primary sidebar

How Engineering Works

  • Home
  • About Us
  • Electrical Engineering
    • Interview Questions
  • Privacy Policy
  • Disclaimer
  • Contact Us
  • Blog

Why are there only 3-phase electrical power systems? why not 6-phase, 9-phase, 12-phase, or some other number of phases?

February 5, 2018 by Kanchan

DWQA Questions › Category: (EE) Power System › Why are there only 3-phase electrical power systems? why not 6-phase, 9-phase, 12-phase, or some other number of phases?
0 Vote Up Vote Down
Kanchan asked 5 years ago
1 Answers
0 Vote Up Vote Down
admin Staff answered 5 years ago

A three phase system can transmit three times the power of single phase with only one extra conductor. Three phase achieves this utilization because in a balanced scenario, i.e. where each phase experiences the same load, the sum of the currents in the any two conductors at any time is equal to the current in the other conductor. Therefore no return or ground wire is required.

This maximum copper utilization cannot be achieved with a greater or lesser number of phases. Also three phase provides a rotating magnetic field that can enable an induction motor to self start. Other  phase numbers can do this as well, but three is sufficient.

Primary Sidebar

Related Questions

  • Where is the return path for three phase current? asked by
  • What are the functions of panels and fire fighting equipment in a substations? asked by admin
  • Why starting motor is required in a gas turbine power plant? asked by admin
  • What is the application of reactive power? asked by

INTERVIEW QUESTIONS

MCQ or Objective


Recommended Post

Electric potential difference or voltage

MCQs on Transmission and Distribution

Electrical Engineering Whatsapp Groups

MCQs on Electrical Circuit Theory

Mechanical Engineering MCQ’s

Categories

  • Electrical Articles (19)
  • Electrical MCQ (75)
  • Electrical Questions (11)
  • Interviews Questions (7)
  • IQ Test (1)
  • Uncategorized (12)



Join Our Whatsapp Group


About Us | Privacy Policy | Disclaimer


Copyright@ Since-2017