A computer controlled system for high voltage studies

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This thesis describes the design and operation of apparatus to repeatedly impulse test Sr6-ir1sulated gaps in order to examine the questions of basic performance of gas insulation. The distinctive feature of impulse voltage testing is that a rapidly rising voltage is applied to a system and results in either a breakdown or a withstand. applied to gaseous insulahts, 'impulse voltage measurements When produce a wide statistical spread of results so that a large number of votlage applications is necessary to est ablish reasonable confidence limits on the distribution. This can be ime-conSUming. Microcomputer technology allows a flexible answer to be given to this concept and such a system is described here with particular emphasis on low-cost solution. rirst, the thesis reviews the mechanisms controlling the volt-time behaviour of SF6 under impulse conditions. A description of impulse test requirements is then given. Thethesis then describes in detail a system which is capable of CQn~olling the high voltage outPUt from a Brandenburg generator. The system Uses a digital to-analogue converter along with a standard interface connected to a Sinclair-ZX Spectrum microcomputer bus.A further circuit is designed to monitor the outPUt volfuge in digital form, it Uses an analogue-to-digital converter controlled by the computer via the same standard interface.