• Home
  • Courses
  • Machines
    • Transformer
    • AC Motors
      • Induction Motor
      • Synchronous Motor
    • DC Motor
    • DC Generator
  • Power System
    • Circuit Breaker
    • Switchgear
    • Substation
    • Control System
    • Measurement
  • Electronics
  • Blog
  • Contact
    • Contact Us
    • Privacy Policy
Have any question?
[email protected]
RegisterLogin
StudyElectrical.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
  • Blog
  • Contact
    • Contact Us
    • Privacy Policy

Transformer

Basic Types of Current Transformers

  • Categories Transformer
Construction of High Voltage Current Transformer

Current Transformers (CT’s) are instrument transformers that are used to supply a reduced value of current to meters, protective relays, and other instruments.

Current Transformers provide isolation from the high voltage primary, permit grounding of the secondary for safety, and step-down the magnitude of the measured current to a value that can be safely handled by the instruments.

Current transformers can be divided into two major types, 

  1. Single-turn (bar) primary and 
  2. Multi-turn wound primary.

Single Turn (Bar) Primary CT

In the single turn primary current transformer, primary conductor may form part of the current transformer assembly, in which case it must be suitably insulated to withstand the system voltage to earth where it passes through the c.t. core and secondary windings.

The majority of single-turn primary current transformers make use of an insulated conductor provided as part of other equipment such as bushings of switchgear or power transformers, and the current transformer is merely a ring core with a toroidally wound secondary winding.

Multi Turn Wound Primary CT

In Multi-turn Wound Primary current Transformer, the primary winding is also constructed inside the current transformer body.  

Construction%2Bof%2BCurrent%2BTransformer1
Multi Turn Wound Primary CT

The primary winding is usually of a single turn. Wound Primary Current transformers are used in applications which require small current transformation ratios.  They are more accurate and have a higher burden capacity.  The wound primary is usually designed with toroidal cores for high efficiency. 

These current transformer are used in High Voltage applications such as electrical substations, power stations etc.

Wound primary current transformers may have the primary and secondary windings arranged concentrically, the secondary winding invariably being the inner winding since it is advantageous to keep the resistance of this winding as low as possible, or, in designs intended primarily for operating instruments, meters and simple overcurrent relays, the primary and secondary windings may be disposed on different limbs of the core. 

Such an arrangement results in minimum weights of windings, and the flux leakage effect resulting from this loose coupling reduces the phase error and limits the secondary current produced by high primary overcurrents.

Related Articles

  • Differences between Power Transformer and Distribution Transformer
    Power Transformer and Distribution Transformer

    The power transformer and distribution transformer are an important part of an electrical power distribution…

  • all day efficiency of transformer
    All Day Efficiency of Transformer

    The ratio of output in kWh to the input in kWh of a transformer over…

  • Tulip contacts of Vacuum Circuit Breaker
    Basic Types of Switchgear Components

    Before learning about different switchgear components, let us understand what is switchgear. The apparatus used…

  • Current Transformer construction
    Current Transformers - Windings and Rated Insulation Levels

    A current transformer is an instrument transformer in which the current ratio is within the…

  • Current
    What Are Current, Resistance and Voltage?

    Voltage, current, and resistance are three properties that are fundamental to almost everything you will…

  • Why 2BCT 2Bsecondary 2Bshould 2Bnot 2Bopen
    Why Current Transformer (CT) Seconday Should not be Open ?

    Amazed why secondary of current transformer should not be open? If it is left open…

  • Share:
author avatar
Electrical Engineer

Previous post

Capacitor Start Single Phase Induction Motor - Working and Characteristics
October 26, 2015

Next post

Functional Characteristics of Protective Relaying
November 11, 2015

You may also like

percentage_reactance transformer
Percentage Reactance in Power System (Transformer, Generator or Reactor)
16 January, 2023
transformer-winding
Transformer Windings: Types and Design
22 November, 2022
Three Phase Transformer
Three-Phase Transformer – Basics and Connection Methods
22 November, 2019

Leave A Reply Cancel reply

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

Search Here

From Blog

dc motor starter need working
Need of a Starter (3 & 4 Point) in DC Motors
14Nov2018
ladder diagram
What is Ladder Diagram and How to Draw a Ladder Diagram?
21Aug2017
Gas insulated switchgear parts
Introduction to Gas Insulated Substations / Switchgears (GIS)
05Dec2017
Differences between Power Transformer and Distribution Transformer
Power Transformer and Distribution Transformer
12May2014

Categories

  • Alternator
  • Arduino
  • Basic Electrical
  • Battery
  • Books
  • Cables
  • Capacitor
  • Career
  • Circuit Breaker
  • Control System
  • DC Generator
  • DC Motor
  • Drives
  • Electric Vehicles
  • Electrical Circuits
  • Electrical Machines
  • Electrical Relays
  • Electrical Safety
  • Electronics
  • Embedded System
  • Exams
  • Generation
  • Guest Post
  • HVDC
  • Instrumentation
  • Interview Questions
  • Locomotives
  • Measurement
  • Microcontroller
  • Objective Questions
  • PCB
  • PLC
  • Power System
  • Problems and Solution
  • Projects
  • Resistor
  • Signals and Systems
  • Single Phase Motors
  • Substation
  • Switchgear
  • Synchronous Motor
  • Three Phase Induction Motor
  • Transformer
  • Transmission Line
  • Uncategorized

Copyright © 2021 Study Electrical, Inc.

© StudyElectrical.Com 2021

Login with your site account

Lost your password?

Not a member yet? Register now

Register a new account

Are you a member? Login now