| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a saturation detector determining whether an instrument current transformer is saturated or not without setting a reference value of a voltage or an excitation current at which the transformer is saturated. <P>SOLUTION: A saturation detector 1 of an instrument current transformer comprises: a second instrument current transformer 3 having a primary side connected to an electric circuit 4 which has a saturation magnetic flux level smaller than that of a first instrument current transformer 2 having a primary side connected to the electric circuit 4; and determination means for determining whether the first instrument current transformer 2 is saturated or not by comparing a secondary-side output waveform of the first instrument current transformer 2 with a secondary-side output waveform of the second instrument current transformer 3. <P>COPYRIGHT: (C)2012,JPO&INPIT |
