THE TWO AREA TESTING CURRENT TRANSFORMER DEVICE HAVING AUTOMATIC TRANSFER ACCORDING TO CURRENT TESTING AREA

摘要

PURPOSE: Two area testing current transformer device having an automatic transfer according to current testing area are provided to extract an advantage from area which divided into a general CT and an air CT to optimize the advantage. CONSTITUTION: A general CT(100) includes a steel corer. The steel core measures the current of an electric line. An air-core CT(200) does not include a steel core. The air-core CT does not include the iron core. The general CT switch unit(300) opens the output of the general CT. The air CT switch unit(400) opens the output of the air CT. A microprocessor(600) receives the output current of the general CT and detects the current value of a wire line. If a set current is abnormal, the microprocessor switches the general CT switch and the air CT switch to enable the output of the air CT.