View What Is Current Transformer Images . A current transformer is a device that is used for the transformation of current from a higher value into a proportionate current to a lower value. A trip point between 1 and 5 amps can be established with a current switch. How Does A Current Transformer Measure The Actual Primary Current Of A 132kv Line Quora from qph.fs.quoracdn.net A current transformer is a device which is used for the transformation of current at a higher value to a lower value with respect to the earth potential. It is commonly used to increase or decrease the supply voltage without a change in the frequency of ac between circuits. Current transformers (cts) are used extensively throughout electrical distribution systems for measuring, metering, and protection applications. A current transformer (ct) is a type of transformer that is used to reduce or multiply an alternating c...