By Noel M. Morris (auth.)
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Extra resources for Electrical Principles III
9) For a given value offrequency and offtux density, the value of Po is approximately constant over the working current range of the transformer. For this reason they are sometimes referred to as constant losses. 3). 4 TRANSFORMER EFFICIENCY The instantaneous per unit efficiency of a transformer for a particular load is given by the expression . 1 a, respectively. 6 lagging. If the transformer delivers full load at unity power factor for 8 hours per day, and it is energised but unloaded for the remainder of the day, calculate the all-day efficiency.
MACHINES the terminal voltage varies with the load current, the series-wound generator is unsuitable for use as a general-purpose generator. 7d). 7). The series and shunt windings are both wound on the main poles of the machine. In cumulative-compound machines the magnetic flux produced by the series and shunt fields are additive. Included in this group are over-compound, level-compound and under-compound machines; the degree of compounding obtained depends on the number of turns of wire on the series winding.
1) In a generator it results in a reduced output voltage (the shaft speed is assumed to remain constant). (2) In a motor it results in increased speed (the supply voltage is assumed to remain constant). c. f. in the armature winding. If the induced voltage is high enough it can lead to flashover between adjacent commutator segments, possibly leading to a complete flashover between the brushes. 5). f. mJ. mJ. mJ. The net result is that the average flux density remains reasonably constant despite large changes in armature current.