Difference Between Current Transformer and Potential Transformer

What is Current Transformer?

Current transformers, also alternatively known as “CTs,” are those transformers responsible for altering voltage by multiplying or reducing currents. They are used to measure currents in alternative circuits. A CT is usually used as a backup or secondary current-producing mechanism that matches the primary current-producing machine by measuring it. In other words, current transformers are devices responsible for secondary currents that match the primary current by measuring it.

/5

Science Quiz

Test your knowledge about topics related to science

1 / 5

After a chemical reaction, the properties of the products are __________.

2 / 5

DNA carries the instructions for an organism to grow. DNA stands for.....

3 / 5

A bond that occurs between metals and nonmetals is called a/an _______________.

4 / 5

A bond that occurs between nonmetals and nonmetals is called a/an _________.

5 / 5

The substances that enter a chemical reaction are called __________.

Your score is

0%

Current transformers, however, are of three types:

  • Window
  • Bar
  • Wound

A current transformer that has winding wrapped around a core is called a “window,” while the one having a bar that is solid through the window and is permanently a “bar” is called a “bar.” Alternatively, a current transformer having separate primary and secondary units is called a wound. In current transformers, usually the number of turns needed to measure the current is small. However, the transformer ratio in a current transformer is usually high. The current transformer is dependent on its own output and doesn’t usually rely on any secondary output. 

What is Potential Transformer?

Potential transformers, also known as voltage transformers, are types of devices connected in parallel to alternative devices. Potential transformers act as a mediator that is responsible for balancing the voltage ratio as measured. They usually provide a minimal load for the supply. The function of potential transformers is usually to measure and protect the power system. Alternatively, they are used to reduce the higher voltage to a lower level. Potential transformers are also alternatively known as “step-down transformers” due to their job or responsibility of toning down the voltage.

Potential transformers are of two types:

  • Metering voltage transformers
  • Protection voltage transformer

Some functions of potential transformers are that:

  • Potential transformers are responsible for reducing the voltage flow from a higher voltage to a lower voltage.
  • Potential transformers are also used to convert a higher voltage current into a standard voltage.
  • To safeguard electricians from high voltages.

Difference Between Current Transformer and Potential Transformer

  1. Current transformers, also alternatively known as “CTs,” are those transformers responsible for altering voltage by multiplying or reducing currents while potential transformers, also known as voltage transformers, are types of devices responsible for reducing the voltage flow from a higher voltage to a lower voltage.
  2. Current transformers are divided into three types that is Window, Bar and Wound while potential transformers are divided into two types that is Metering voltage transformer and Potential voltage transformer.
  3. The transformation ratio of a current transformer is high compared to that of a potential transformer which is low.
  4. The number of windings in a current transformer is low in number to that of a potential transformer which has a comparatively higher number of windings.
  5. Current transformers are independent units and doesn’t depend on any secondary units while potential transformers to fully operate they need a backup of primary unit.

Comparison Between Current Transformer and Potential Transformer

Parameter of ComparisonCurrent TransformerPotential Transformer
DefinitionCurrent transformers are those transformers responsible for altering voltage by multiplying or reducing currents.Potential transformers are types of devices responsible for reducing the voltage flow from a higher voltage to a lower voltage.
TypesCurrent transformers are of three types namely Window, Bar and Wound.Potential transformers are of two types: Metering voltage transformers and Protection voltage transformer.
Transformation ratioCurrent transformers has high transformation ratio.Potential transformers has low transformation ratio.
DependencyCurrent transformers are not dependent on secondary units.Potential transformers are dependent on secondary units.
Input valueCurrent transformers require a constant flow of currents.Potential transformers require a constant flow of voltage.
MaterialCurrent transformers are designed with silicon steel.Potential transformers are designed with top notch steel.
WindingThe number of windings is low in current transformers.The number of windings is high in potential transformers.
FunctionCurrent transformers are given with the responsibility of maintaining current flow.Potential transformers are given with the responsibility of maintaining voltage flow.
Alternative namesAlternatively known as CT.Alternatively known as voltage transformer.

References

  1. https://ieeexplore.ieee.org/abstract/document/108902/
  2. https://digital-library.theiet.org/content/journals/10.1049/pi-2.1953.0089
One request?

I’ve put so much effort writing this blog post to provide value to you. It’ll be very helpful for me, if you consider sharing it on social media or with your friends/family. SHARING IS ♥️