Abstract: An oil-impregnated capacitor produced by infiltrating a liquid impregnant containing at least one organometallic compound, represented by organic silane compounds, having a hydrolyzable group represented by alkoxy groups and acyloxy group and an organic functional group represented by vinyl group, epoxy group, mercapto group, methacrylo group, chlorine atom and peroxide group. It shows good characteristics when used under high stress conditions, in particular, at a high temperature and a high voltage.

Abstract: A corona discharge detection apparatus particularly suited for use in detecting corona signals mixed with noise which is in synchronism with a cycle of a power supply such as corona discharge which occurs in a flyback transformer of a television receiver. The noise and the corona signals are converted to a digital signal and the digital signals in two cycles are subtracted one from the other and the resulting digital signal is converted to an analog signal for observation. In this manner, a corona signal which has not been detected by a phase technique can now be detected.

Abstract: There is provided a device for detecting corona discharges generated in a high voltage generator which is operated by high frequency pulses, for example in a high voltage transformer which is used in the horizontal deflection circuit of a television receiver.