• Home
  • Courses
  • Machines
    • Transformer
    • AC Motors
      • Induction Motor
      • Synchronous Motor
    • DC Motor
    • DC Generator
  • Power System
    • Circuit Breaker
    • Switchgear
    • Substation
    • Control System
    • Measurement
  • Electronics
  • Books
  • Blog
  • Forums
  • Contact
    • Contact Us
    • About
    • Privacy Policy
RegisterLogin
StudyElectrical.ComStudyElectrical.Com
  • Home
  • Courses
  • Machines
    • Transformer
    • AC Motors
      • Induction Motor
      • Synchronous Motor
    • DC Motor
    • DC Generator
  • Power System
    • Circuit Breaker
    • Switchgear
    • Substation
    • Control System
    • Measurement
  • Electronics
  • Books
  • Blog
  • Forums
  • Contact
    • Contact Us
    • About
    • Privacy Policy

Power System

  • Home
  • Blog
  • Power System
  • Why Current Transformer (CT) Seconday Should not be Open ?

Why Current Transformer (CT) Seconday Should not be Open ?

  • Categories Power System, Electrical Machines, Transformer
Why 2BCT 2Bsecondary 2Bshould 2Bnot 2Bopen
Why%2BCT%2Bsecondary%2Bshould%2Bnot%2Bopen
Amazed why secondary of current transformer should not be open? If it is left open it may destroy the current transformer.
So it is very important that the secondary of Current Transformer should not be kept open.  The reason is quite interesting.

Either it should be shorted or must be connected in series with a low resistance coil such as current coils of watt meter, coil of ammeter etc.

Related: Why Transformers are Rated in kVA, Not in kW?

If it is left open, then current through secondary becomes zero hence the ampere turns produced by secondary which generally oppose primary ampere turns becomes zero. 

As there is no counter m.m.f., unopposed primary m.m.f. (ampere turns) produce high flux in the core. 

  • This produce excessive core losses, heating the core beyond limits. 
  • Similarly heavy e.m.f.s will be induced on the primary and secondary side. This may damage the insulation of the winding. 

This is danger from the operator point of view as well. It is usual to ground the C.T. on the secondary side to avoid a danger of shock to the operator. 

Hence never open the secondary winding circuit of a current transformer while its primary winding is energized. 

Thus most of the current transformers have a short circuit link or a switch at secondary terminals. When the primary is to be energized, the short circuit link must be closed so that there is no danger of open circuit secondary. 

  • Share:
author avatar

Previous post

Ideal Transformer and Practical Transformer

Next post

What Jobs Electrical Engineers Do? | Roles and Responsibilities

Leave A Reply Cancel reply

Your email address will not be published. Required fields are marked *

Login with your site account

Connect with

Login with Facebook Login with Google Login with LinkedIn

logo


Lost your password?

Not a member yet? Register now

Recent Articles

  • 7 FE Electrical and Computer Practice Problems with Solutions
  • Sinusoids and Phasors
  • 2 Important Distribution Transformer Testing Methods
  • What is welding cable? Where to buy cheap cable for my welding plant?
  • Facts Everyone Should Know About Trailer Wires
For Advertisements Contact
[email protected]

Copyright © 2020 Study Electrical, Inc.

© StudyElectrical.Com 2020

Connect with

Login with Facebook Login with Google Login with LinkedIn

logo

Login with your site account

Connect with

Login with Facebook Login with Google Login with LinkedIn

logo


Lost your password?

Not a member yet? Register now

Register a new account

Connect with

Login with Facebook Login with Google Login with LinkedIn

logo


Are you a member? Login now