| 摘要 |
PURPOSE:To test an internal fault of a laminated ceramic capacitor nondestructively by detecting a pulse voltage which corresponds to corona discharge occurring at the fault part. CONSTITUTION:In a detecting circuit A, a laminated ceramic capacitor 13 is applied to an AC voltage. Then, corona discharge occurs at a gap part of the capacitor 13 as a fault part due to void and layer peeling to obtain only a pulse voltage which corresponds to a corona discharging current through the matching circuit 21 of a measuring circuit B, connected to a resistance 14, an impedance matching coaxial cable, filter 23, etc., thereby displaying the number of generated pulse voltage per unit time on an indicator 25 such as an oscilloscope while using the peak value of corona pulses as a parameter. Thus, an internal fault of the laminated ceramic capacitor is tested nondestructively. |
