current transformer and potential transformer theory pdf

Current Transformer And Potential Transformer Theory Pdf

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Electrical Sensors: Potential Transformers (PTs) and Current Transformers (CTs)

Hence the secondary of current transformer is never left open. Accuracy class: Metering needs high accuracy at load current while Protection need not have that high accuracy. Safety Factor: It determines the multiplicity of load current at which the CT saturates. Metering CT should have lesser value so that it saturates before the meters can get damaged due to some abnormality. Protection should have high value since its main purpose desires the CT to withstand high fault currents to be sensed back to the relays. The primary is typically the main power line conductor, which passes directly through the toroidal core. M is designation for metering.

Recieve free updates Via Email! Home Electrical machines Power system Ask a question Contact electricaleasy. Share: Facebook Twitter Linkedin. Instrument Transformers How will you measure AC currents and voltages of very high magnitude? You will need the measuring instruments having higher range, which literally mean huge instruments. Or there's another way, using the transformation property of AC currents and voltages. You can transform the voltage or current down with a transformer whose turns ratio is accurately known, then measuring the stepped down magnitude with a normal range instrument.

Potential and Current Transformers

The electrical instruments are not directly connected to the meters or control apparatus of high voltage for safety purpose. The instrument transformers like voltage transformer and current transformer are used for connecting the electrical instruments to the measuring instruments. These transformers reduce the voltage and current from high value to the low value which can be measured by conventional instruments. The construction of the current and potential transformer is similar as both have the magnetic circuit in their primary and secondary winding. But they are different in the method of working. There are several types of differences between the voltage and the current transformer.

From these primary variables, we may determine impedance, reactance, resistance, as well as the reciprocals of those quantities admittance, susceptance, and conductance. Other sensors more common to general process measurements such as temperature, pressure, level, and flow are also used in electric power systems, but their coverage in other chapters of this book is sufficient to avoid repetition in this chapter. Two common types of electrical sensors used in the power industry are potential transformers PTs and current transformers CTs. Electrical power systems typically operate at dangerously high voltage. It would be both impractical and unsafe to connect panel-mounted instruments directly to the conductors of a power system if the voltage of that power system exceeds several hundred volts.

Free download application of potential transformer pdf. Potential Transformer PT Definition — The potential transformer may be defined as an instrument transformer used for the transformation of voltage from a higher value to the lower value. This transformer step down the voltage to a safe limit value which can be easily measured by the ordinary low voltage instrument like a voltmeter, wattmeter and watt-hour meters, etc. The potential transformers and accessories covered by this specification shall comply with the requirement of the latest edition of the following standards unless otherwise stated in this specification: IS: Part I-IV : Specification for Voltage Transformer. IS: Application guide for Voltage Transformers.


HV Current / Voltage Transformers CT & PT. LB Current Transformer. LB Current Transformer. JDC Figure of Electric Principle. +2.


Difference between Current Transformer and Potential Transformer

Skip to Main Content. A not-for-profit organization, IEEE is the world's largest technical professional organization dedicated to advancing technology for the benefit of humanity. Use of this web site signifies your agreement to the terms and conditions. Basic Theory and Practical Considerations in a Current Transformer Abstract: In this paper, a brief discussion about the theory and the governing fundamentals of a current transformer CT is presented. A classical modeling of the CT identifying the essential parameters is introduced and the basic formulas relating the CT voltage, current, burden, and their relationships have been discussed.

Current transformer

Transformers Engr.

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3 Comments

  1. Jade L.

    Current Transformers CT and Potential Transformers PT are used to measure the current and voltage in a circuit of the order of hundreds of amperes and volts respectively.

    31.03.2021 at 09:50 Reply
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