CTT - Current Transformer Tester

The CTTx2 & CTTx5 are rugged and easy to use current transformer testers, that offer Automatic & Manual testing modes. These instruments are designed to deliver fast and reliable measurements.

Current transformer testing is an important part of the commissioning and maintenance of power systems. Protective relays can only operate adequately, under normal and fault conditions, if they receive the correct secondary current from the current transformers. Therefore accurate CY testing to evaluate their performance under all conditions is essential to assure reliable operation of the protection system.

The CTT will test the Current Transformer Ratio, Phase shift, Polarity, Excitation, Saturation, Winding resistance and Insulation resistance using the voltage method in compliance with ANSI/IEEE C57.13.1 & IEC 60044-1 standards, where voltage is applied to the secondary X terminals of the current transformer. The CTT Burden test injects a current into the secondary loop to verify the integrity of the current circuit and to determine its impedance & VA. This information is required to insure the CT will perform under all circumstances.

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