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Electrical Equipment Its Selection And Arrangement With Special Reference to F

Cover Electrical Equipment Its Selection And Arrangement With Special Reference to F
Electrical Equipment Its Selection And Arrangement With Special Reference to F
Harold Warner Brown
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The meaning of 60 minutes phase displacement is that the secondary current is 1 degree (1/360 of a cycle) ahead of the primary. If the primary has a lagging current, this dis- placement tends to make a wattmeter or watt-hour meter reading too high, whereas the ratio error tends to make it top low; so that the two errors tend to neutralize each other.
The effect of phase displacement on wattmeter and watt-hour meter indications is as follows: 1. 00 f 0. 02 of 1 0. 90 The error per cent, introduc
...ed per \ 0. 85 of 1 0. 80 degree of phase displacement is } 1. 3 0. 70 1. 7 With a lagging current having a power factor of Fig. 92 shows ratio and phase displacement curves of a trans- former such as was used in Figs. 89 to 91, under various condi- tions of loading, with various instruments connected to the transformer secondary. Fig. 93 is similar to Fig. 92, but refers to a transformer of 10 volt-amp, secondary capacity.
1 For example, where charges for electric energy are made from the meter readings.


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