Series of capacitors developed in NOVIK Research and Production Corp. (Fig.

The progress in high-voltage capacitors is connected with using of all-film insulation. In process of fabrication of such capacitor there arise the problem of its impregnation. Analysis showed that for each polymer material it is necessary to select proper impregnating liquid. Process of wetting may be controled by means of surface active agents (surfactants) introduced into liquid. Impregnation of good quality provides high electric strength of insulation. In the case of surfactants application it can be also recieved due to change of near-electrode and bulk processes in insulation. Proper selection of surfactants can increase breakdown stress of polypropylene and polyethylene terephtalate by 3 0 4 0 % with simultaneouse increase of service life by 1...3 orders.

The paper describes investigations of elementary processes, taking place in deionized water under strong electric fields. Special methods of diagnostics using Mach-Zehnder interferometer as well as chronograpfy of the processes with high space and time resolution on electronic-optical transducer have enabled to registrate the process of electrostriction pressure setting within the gap in the weak non-uniform field and the mechanism of deionized water electric strength breaking, occuring under comparatively low electric fields and basing on the near-cathode processes.

The results of investigation of prebreakdown processes in deionized water are shown. In experiments is detected process of settin of electrostriction pressure in wave regime. In d e i o d water is registered mechanism of breaking of electric strength, which is based on near cathode processes.

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