METHOD FOR MEASURING PARTIAL DISCHARGE

PROBLEM TO BE SOLVED: To prevent a drop in impedance in a high frequency band by eliminating saturation of a high frequency iron core mounted on a short-circuiting jumper line in measuring partial discharge. SOLUTION: Fixing jigs 104a, 104b of an insulation connection 102 provided between main cables 101a, 101b are short-circuited by a short-circuiting jumper line 105 whose end is grounded by a ground line 108 or is not grounded, metallic foil electrodes 110a, 110b are stuck to a surface of the insulation connection 102, and detection impedance 111 is connected to the electrodes for measuring partial discharge. At this time, high frequency iron cores 106, 109 with a gap are mounted on the short-circuiting jumper line and the ground line 108. Thus even if commercial frequency current flows in a metallic sheath circuit, saturation in magnetic flux may not occur, so that a sufficiently high impedance value can be obtained in a frequency band for measuring partial discharge.