This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1921 Excerpt: ... of static condensers is very commonly expressed as being equal to j Loss in kw. Kva..input. This expression is useful as a convenient figure of merit, but it does not give the real efficiency. The true efficiency of a condenser may be defined as the ratio of the energy restored to the circuit during the quarter.period ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1921 Excerpt: ... of static condensers is very commonly expressed as being equal to j Loss in kw. Kva..input. This expression is useful as a convenient figure of merit, but it does not give the real efficiency. The true efficiency of a condenser may be defined as the ratio of the energy restored to the circuit during the quarter.period in which the condenser is discharging, to the energy received to charge the condenser during the previous quarter.period. As defined thus, the efficiency has a real physical meaning. Let p = loss, in watts Pc = input, in volt.amp. / = frequency, in cycles per sec. Then the duration of the charging quarter. period = 1 4/sec. The maximum rate at which energy is received during charging = Pc watts; and the mean rate = 2pcjit watts. Hence, the energy stored at maximum voltage = 2Pcj4: vf watt sees. The energy lost per sec.. i.e. per 2/ complete cycles of charge and discharge = p watt.sec. = pj2f watt.sec. per cycle. Hence, the true efficiency =1-wjLf =1-7TplPy An " efficiency " of 99.5 per cent., as commonly expressed, corresponds to a true efficiencv of 98.43 per cent. In practice, it is sufficient to know the value of the loss in kw. per kva..input, and there is no need to introduce considerations as to the value of the efficiency. Influence of Supply Frequency on Dimensions of Static Condensers. It has already been shown that the capacity required per kva. varies inversely with the frequency at which the condenser operates. As a result, the cost of static condensers to effect a given compensation in the wattless component of the current is much less with high than with low frequencies. Static Condenser Installations. In this country there is now an appreciable number of cases in which static condensers have been installed for the purp...
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All Editions of Power Factor Correction: Explaining the Meaning and Importance of Power Factor, and Describing Methods for the Improvement of Power Factor
