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

Comparison Chart

Basis for ComparisonCurrent TransformerPotential Transformer
DefinitionTransform the current from high value to low value.Transform the voltage from high value to the low value.
Circuit Symbolcurrent-transformer-circuit-diagram-1potential-transfomer-circuit-diagram
CoreUsually built up with lamination of silicon steel.It is made up of with high-quality steel operating at low flux densities
Primary WindingIt carries the current which is to be measuredIt carries the voltage which is to be measured.
Secondary WindingIt is connected to the current winding of the instrument.It is connected to the meter or instrument.
ConnectionConnected in series with the instrumentConnected in parallel with the instrument.
Primary CircuitHas a small number of turnsHas a large number of turns
Secondary CircuitHas a large number of turns and cannot be an open circuit.Has a small number of turns and can be an open circuit.
Range5A or 1A110v
Transformation RatioHighLow
BurdenDoes not depends on the secondary burdenDepends on the secondary burden
InputConstant currentConstant Voltage
Full line currentThe primary winding consists of the full line current.The primary winding consists of the full line voltage.
TypesTwo types ( Wound and Closed Core )Two types (Electromagnetic and Capacitor voltage)
ImpedanceLowHigh
ApplicationsMeasuring current and power, monitoring the power grid operation, for operating protective relay,Measurement, power source, operating protective relay,

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