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Calibration of uniform-field spark-gaps for high-voltage measurement at power frequencies

Calibration of uniform-field spark-gaps for high-voltage measurement at power frequencies

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A calibration is given for spark-gap electrodes designed to ensure that the spark path lies in a uniform field, and it is shown that for all three sizes of electrodes investigated, covering a range of 9 to 315 kV (peak), the sparkover voltages are within 0.2% of the values given by the empirical lawV=24.22S+6.082SkV (peak) at 20°C and atmospheric pressure of 760 mm Hg, where S is the electrode spacing in centimetres.All observations were made with vertical gaps having the lower electrode connected to earth, and comparative data were obtained for a sphere gap with electrodes 25 cm in diameter. The effects of surrounding objects and of faulty alignment of the electrodes were determined experimentally, and on the basis of these results a number of recommendations are made, giving the limits within which the spark-over voltage is defined by the above equation.

Inspec keywords: voltmeters; spark gaps

Subjects: Voltage measurement

http://iet.metastore.ingenta.com/content/journals/10.1049/ji-2.1947.0052
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