 HomeNewsMetering current transformer ratio selection-Database

Metering current transformer ratio selection-Database

2023-02-07

Probe current voltage pin 420*4450 head diameter 5.0 over current current and voltage pin

inductance

Determination of rated voltage Determination of rated voltage Determination of rated voltage Determination of rated voltage The rated voltage UN of the Current Transformer should be compatible with the voltage UL of the line under test,ie UN≥UL.Determining the rated ratio of the rated ratio The determining of the rated ratio is determined by determining the rated primary current I1 according to the primary load connected to the current transformer,ie:I1=P1/UNcosψwhere UN-current mutual inductance Rated voltage of the device,kV;P1--the primary power load connected by the current transformer,kVA;cosψ--the average power factor,generally calculated as cosψ=0.8.

In order to ensure the accuracy of the measurement,the primary current during normal operation should be selected to be about 60%of its rated value,at least not less than 30%.The rated ratio of the current transformer is determined by the ratio of the rated primary current to the rated secondary current.Determination of rated secondary load Determination of rated secondary load Determination of rated secondary load Determination of rated secondary load If the secondary load connected to the transformer exceeds the rated secondary load,its accuracy level will decrease.In order to ensure the accuracy of the measurement,it is generally required that the secondary load S2 of the current transformer must be within the range of 25%to 100%of the rated secondary load S2N,ie:0.25S2N≤S2≤S2N rated power factor of the rated power factor Determination of the rated power factor Determination of the rated power factor The current factor of the rated secondary load of the current transformer should be 0.8~1.0.

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