METHOD FOR MEASURING PARTIAL DISCHARGE FROM WINDING OF ROTARY MACHINE

摘要

PROBLEM TO BE SOLVED: To quantitatively and accurately measure the partial discharge from the winding of a rotary machine even during the course of the operation of the rotary machine by realizing high-accuracy charge calibration by a simple method. SOLUTION: At the time of performing a periodic inspection on a rotary machine by stopping the operation of the machine, the response characteristic of a measuring instrument 25 to injected quantities of charges is grasped by injecting pluses having already known quantities of charges into the winding in the slot of the stator section of the machine and detecting partial discharge signals generated in an insulating section with the instrument 25. When the partial discharge from the winding is measured while the machine is operated, a pulse generator 11 is connected to the instrument 25 and the output pulse of the generator 11 is adjusted so that the detecting signal of the instrument 25 may become the same as that detected during the periodic inspection. Then the quantity of partial discharge from the insulating section of the winding is measured in terms of the quantity of charges by using the detecting signal of the instrument 25 to the output pulse as calibrating charges.