It is possible to measure pulsed high voltages with the help of two spheres of equal radius placed on the same axis. In which case the approximate impulse voltage value that can be measured with such a system with diameters of 500 mm and known spacing between them is 2.5 cm, is given correctly. (Ambient conditions are neglected and take Ed = 30 kV / cm2 k = 0.9) a) 68,65114 kV b) 81.30081 kv c) 97,08737 kv d) 65,35947 kv e) 57.48835 kv f) 46.21612 kv

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Power Measurement

According to Blondel's theorem, the total power is measured with one less number of wattmeters than the number of wires present in the system. So, a single-phase and two-wire system will require one wattmeter and a single-phase and the three-wire system will require two wattmeters, and a three-phase and the three-wire system will also require two wattmeters and a three-phase and the four-wire system will require three wattmeter devices. The wattmeter is a device that measures power using one voltage and one current input as shown in the above figure. Multiple current or voltage input pair cables are used by many power analyzers and digital storage oscilloscopes (DSOs) for measuring watts, in effect within a single instrument acting as multiple wattmeters. It is possible to measure three-phase and four-wire power with one correctly specified power analyzer.