Difference between current and voltage transformer pdf

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difference between current and voltage transformer pdf

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The electrical instruments are not directly connected to the meters or control apparatus of high voltage for safety purpose.

Difference Between Current Transformer (CT) & Potential Transformer (PT)

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. A CT has large number of turns on its secondary winding, but very few turns on its primary winding. The primary winding is connected in series with the load so that it carries full load current. A low voltage range ammeter A is connected across the secondary winding terminals. Secondary of the CT is practically short circuited since the ammeter resistance is very low. It should be remembered that secondary of the CT should not be made open as it draws heavy current and damages the primary winding of the CT.

Current Transformer Vs. Potential Transformer: Understanding the Differences

Electrical Academia. Current transformers CT are broadly employed in order to measure high magnitude currents. Such transformers basically step down lower the current which is to be measured, so that it can be measured with an average range ammeter. A CT generally possesses one or few primary turns. The primary side winding could be simply a conductor positioned in an empty hollow core. Whereas the secondary side possesses a large number of turns which are precisely wound for a particular turns ratio.

A current transformer CT is a type of transformer that is used to reduce or multiply an alternating current AC. It produces a current in its secondary which is proportional to the current in its primary. Current transformers, along with voltage or potential transformers, are instrument transformers. Instrument transformers scale the large values of voltage or current to small, standardized values that are easy to handle for measuring instruments and protective relays. The instrument transformers isolate measurement or protection circuits from the high voltage of the primary system. A current transformer provides a secondary current that is accurately proportional to the current flowing in its primary. The current transformer presents a negligible load to the primary circuit.

Premium Membership. Learn from experienced power engineers. The CTs current transformers and VTs voltage transformers are provided in the plants to reduce the voltage and current values of the plant to values such as to be able to be detected by measurement and protection devices. They also make the secondary measurement and protection circuits galvanically independent in relation to the primary power circuit, at the same time guaranteeing greater safety for operators a point of the secondary winding of the instrument transformer must always be connected to ground. For correct identification and removal of the fault it is necessary for all the components to operate correctly.


Current transformers (CT) are broadly employed in order to measure high magnitude currents. Voltage transformers (VTs) are essentially step down transformers.


Difference Between Current Transformer (CT) & Potential Transformer (PT)

Technical information on Kappa products Instrument transformers are used for measurement and protective application, together with equipment such as meters and relays. Their role in electrical systems is of primary importance as they are a means of "stepping down" the current or voltage of a system to measurable values, such as 5A or 1A in the case of a current transformers or V or V in the case of a voltage transformer. This offers the advantage that measurement and protective equipment can be standardized on a few values of current and voltage.

Difference between Current Transformer and Potential Transformer

Category: Electricity Specification: S-E rev. These specifications apply to instrument transformers which are intended to be used in revenue metering. Specifications for current transformers are applicable only for solid core devices.

Difference between Current Transformer and Potential Transformer

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. A CT has large number of turns on its secondary winding, but very few turns on its primary winding. The primary winding is connected in series with the load so that it carries full load current. A low voltage range ammeter A is connected across the secondary winding terminals. Secondary of the CT is practically short circuited since the ammeter resistance is very low. It should be remembered that secondary of the CT should not be made open as it draws heavy current and damages the primary winding of the CT.

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