Partial discharge detecting device

Application Number: 00108688
Application Date: 2000.05.17
Publication Number: 1274087
Publication Date: 2000.11.22
Priority Information: 1999/5/18 JP 137723/99
International: G01R29/00;G01R31/12
Applicant(s) Name: Mitsubishi Denki K. K.
Inventor(s) Name: Tomoyasu Keisuke
Patent Agency Code: 31100
Patent Agent: sun jingguo
Abstract The present invention provides a partial-discharge detecting device. The partial-discharge detecting device is provided with the followings: an apparatus 1, which detects electromagnetic waves in accordance with the partial discharge generated due to the deterioration of insulation in electric power facility; an apparatus 3, which detects a peak value of an electric signal that is the electromagnetic wave detected by the means 1; the first comparator 4, which compares the peak value detected by the apparatus 3 with the first predetermined value and outputs a signal when the peak value is larger than the first predetermined value; the signal generation circuits 11, 4a, which generate and output a signal for detecting a synchronization condition of electric power supplied to the electric power facility and the signal outputted by the first comparator 4 based on the signal outputted by the first comparator 4; an apparatus 5, which judges the occurrence of partial discharge based on the detected synchronization condition; and an apparatus 6, which outputs an alarm.