Electrical Measurements

Cover Electrical Measurements
Electrical Measurements
Laws, Frank A. (Frank Arthur), 1867-1936
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The ad- vantage is that if the dis- tance between the electrodes Fir Humi-dity Per cent A i p / // ' / // u / 2 // / J/f 7 n '/f / j '// I //, // / y/, / /// $/ /> y/ M x It I/ w / i f\ / j 3 5 10 15 20 25 30 35 40 45 50 55 G( Spacing in cm . 148. Showiner effect of hnmirlil 0. 354 is less than three times the on the action of a needle-point spark radius of the spheres, the gap corona does not form before the gap breaks down. The erratic effects due to broken down air around the electrodes are ...thus avoided. Humidity has no influence on the results.
An additional advantage is that the length of the gap is much reduced; with spheres 25 cm. In diameter, the spark- ing distance for 200 kv. Is about 13 cm. Against about 52 cm. For the' needle-point Note : A variation of 1 cm. In thickness and g a P width of wooden parts is permissible rpn i ^ 1/ln e, . , The sphere gap is especi- FIG. 149. Spark gap with spherical electrodes. Ally adapted for measuring 264 ELECTRICAL MEASUREMENTS extra high voltages, above 50 kv.


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