| 摘要 |
PURPOSE:To make it possible to certainly detect even initial abnormality without stopping the supply f a current, by performing judgement by simultaneously measuring the surface temps. of an electric wire at a position separated by 10- 50cm from the connection part of the electric wire in the longitudinal direction and at a position nearer to the side of said connection part. CONSTITUTION:A position separated by 10-50cm from the end part of a connection sleeve 2 as the connection part of an overhead transmission line 1 is set to B and a position separated by 10cm or less to A. When the surface temps. of the transmission line 1 are simultaneously measured by supplying a current to said line 1, the temp. at the point B becomes high when a connection state is normal while that at the point A becomes high when abnormal and, therefore, potentials, which are obtained by two temp.-voltage converters 5 supported so as to be spaced apart to each other at a predetermined interval in a temp. difference measuring part 3, are compared by a potentiometer 6 and temps. at two points are simultaneously measured. By this method, temp. difference is accurately detected and the abnormality of the connection part of the transmission line can be certainly detected even at a separated position. |
