| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a current transformer and an instrument for measuring an alternating current electric energy, which are installed in a narrow place, easily correct a phase difference and a current transformation ratio, and allow precise and wide-ranged measurement. <P>SOLUTION: This current transformer 10 has a storage part 15 for storing a correction value as to the phase difference and the current transformation ratio between a preliminarily measured current and a secondary side current. This current transformer 10 has also a current component output terminal 16 for outputting a current component signal based on the secondary side current, and the phase difference and the correction value stored in the storage part 15. A measuring instrument main body 20 has a current component input terminal 21 which is connected disconnectably to the current component output terminal 16, and inputs the current component signal, the phase difference and the correction value. The measuring instrument main body 20 has also a computing part 23 for phase-correcting the input current component signal, based on the input phase difference, and for calculating the electric energy, based on the phase-corrected current component signal, a voltage and the input correction value. <P>COPYRIGHT: (C)2007,JPO&INPIT |
