Hello, readers welcome to new post. Here we will discuss Difference Between Current Transformer (CT) & Potential Transformer (PT). The transformer is a device that is used for changing the voltage from high to low or low to high. The transformer used for high to low volts is called step down and the other is called to step up which converts low to high.
There are different types of transformers are used with small level transformers called instruments, like a current transformer and a potential transformer. The current transformer is used for current measuring and the potential transformer is used for volts measure. Here we will discuss different points to find the differences between the Current Transformer (CT) & Potential Transformer (PT). So let gets start Difference Between the Current Transformer (CT) & Potential Transformer (PT).
Difference Between Current Transformer (CT) & Potential Transformer (PT)
What is the Current Transformer
- A current transformer is a category of transformer used for decrement and increment in the ac current. It generates the current in the secondary windings that is directly proportional to the primary current
- The current transformer is called the instrument transformer. It is used to for decrement the current and volts to a smaller level.
- This transformer separates the measuring circuits from the high volts of the main circuits.
- This transformer output is equal to the current flowing at the primary side and gives very less load to the primary side
- It is used in power system generation point industries and substations.
- This transformer comes with primary windings core and secondary windings.
- This transformer is created to sustain the ratio among the current at primary and secondary circuits according to the defined value.
- There is no effect of the CT connection at the main circuit
- In CT is silicon steel ring core is used having numerous turns.
- The conductors have current passes in the ring of CT.
- CT is used in series combination to the circuit
- It has less turns than the pt at primary and larger at secondary
- It can measure the current up to five amps
- Its input is current and has a constant value
- It has two main types wound and core
- Its impedance is less
What is a Potential Transformer (PT)
- The potential transformer is used to protect and measure the potential of the system. It is used to measure the larger ac volts of the system.
- It is a step-down transformer that has a larger turn at the primary and less at the secondary.
- There is the use of a low-range voltmeter for measuring the volts through PT.
- It comes with shell-type construction to give good results.
- It gives good protection to its users since it is connected to the ground.
- Its primary is linked to high volts, and the less range voltmeter of AC nature is linked to the secondary of PT.
- The relation among the line volts and voltmeter volts is given as line volts denoted as Vp and voltmeter volts as VS.
VP/VS=NP/NS
- It is created with steel having a high flux density.
- It is connected in parallel combination.
- Volts areng is one ten can be measured through it.
- Its two types are electromagnetic and capacitor voltage.
Current Transformer vs. Potential Transformer
Current Transformer
- The instrument transformer is used for reducing the high current of the power system to a lower value that can be measured with a device called a current transformer.
- CT’s full form is the current transformer.
- CR reduces the larger current to save and measure value.
- It is a voltage step-up and current step-down transformer.
- Its other types are Wound Type CT, Toroidal CT, Bar Type CT, and Summation CT.
- It has fewer turns for primary and high for secondary. In normal uses, a single turn exists on the primary side of CT.
- The primary winding is connected with a series to the power line where the current is measured.
- It comes with a high transformation ratio called the CT ratio.
- During working, the secondary winding is not open and can damage the transformer.
- Primary winding conductors are thick and have high current carrying. The secondary winding conductors are thin and have low current.
- Its secondary winding rating is one amper or five amper.
- The core of this transformer is made with the use of silicon steel laminations.
Potential Transformer
- It is an instrument transformer type that reduces high voltage to low voltage for measuring levels.
- It is used for denoting potential transformers.
- It decreases the value of high voltage to a safe and measuring value.
- Its main function is to step down voltage and step up current.
- The two types of potential transformers are electromagnetic PT and capacitive PT.
- Its primary winding has high turns, and its secondary winding has fewer turns.
- The primary winding of this transformer was made in parallel with power lines, and voltage was measured.
- It comes with a low transformation ratio called the PT ratio.
- It has an open secondary winding when working.
- The transformer and conductor used for primary winding are thin, and the secondary has thick conductors.
- For industries, 110 volts are at the secondary voltage rating of the transformer.
- Potential transformer accuracy based on load, such as if many voltmeters connected with secondary winding will have error results
- Its core is made with quality steel and works for low flux densities.
That is all about the Difference Between Current Transformer (CT) & Potential Transformer (PT) all paramerts has been explained if you have any further query ask in the comments. See you in next post.
