| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To determine deterioration in a connection tube regardless of a value of current flowing in an electric wire and the connection tube. <P>SOLUTION: In induced voltage measurement, an induced voltage, which is excited by a current component existing on a plane vertical to an axial direction of the electric wire 10 in a plurality of places including at least a compression connection tube 21 on the periphery of the electric wire 10, is measured simultaneously while an AC current flows in the compression connection tube 21 and the electric wire 10. The induced voltage measurement is performed when deterioration in the compression connection tube 21 is determined, and the deterioration in the compression connection tube 21 is determined based on a phase difference of respective induced voltages obtained by the induced voltage measurement in the deterioration determination and a reference value, thus determining the deterioration in the compression connection tube 21 regardless of the value of current flowing in the compression connection tube 21 and the electric wire 10. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
