What is rct in current transformer

FAQ | Mar 07,2023

RCT stands for “Ratio Correction Transformer,” which is a type of transformer used in conjunction with a current transformer (CT) to correct the errors in the CT’s turns ratio. The turns ratio is the ratio of the number of turns in the CT’s primary winding to the number of turns in its secondary winding, and it determines the magnitude of the current that can be measured by the CT.

The turns ratio of a CT can vary due to several factors, including manufacturing tolerances, the frequency of the measured current, and the level of the primary current. These variations can result in errors in the CT’s measurement accuracy. The RCT is designed to correct these errors by adjusting the CT’s turns ratio to the desired value.

The RCT is typically connected in series with the secondary winding of the CT and has its own secondary winding, which is connected to a burden resistor or a measuring instrument. The RCT’s turns ratio is designed to be adjustable, so that it can be calibrated to correct the CT’s turns ratio errors.

By using an RCT in conjunction with a CT, the measurement accuracy of the CT can be improved, which is especially important in applications where precise current measurements are required, such as in power generation, transmission, and distribution systems.

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