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Q. A 75-kVA, 230/115-V, 60-Hz transformer was tested with these results:
• Open-circuit test: 115 V, 16.3 A, 750 W
• Short-circuit test: 9.5 V, 326 A, 1200 W
Determine:
(a) The equivalent impedance in high-voltage terms.
(b) The voltage regulation at rated load, 0.8 power factor lagging.
(c) The efficiency at rated load, 0.8 power factor lagging, and at half-load, unity power factor.
(d) The maximum efficiency and the current at which it occurs.
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Increase in HT and LT Ratio It is well known that for high HT/LT ratio, the losses will be low. The losses for a given quantum of power supplied through a line are inversely p
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Examples of attribute data relevant for a power utility: Examples of attribute data relevant for a power utility are given below. • Consumer data such as categor
Q. A magnetic circuit is found to have an ac hysteresis loss of 10 W when the peak current is Im = 2 A. Assuming the exponent of Bm to be 1.5, estimate Ph for Im = 0.5A and 8A.
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I need help with some circuits.
If a permanent magnet creates the flux in a magnetic circuit, the flux exists without the need for a coil, so how does Amperes Law apply to this case? In this case the flux is
how can we increase insulation resistance of sheet
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