By Dana Bell
Air strength colours Vol 3:1945-47
Read Online or Download Air Force Colors Volume 3: Pacific & Home Front 1942-1947 - Specials series (6152) PDF
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Extra info for Air Force Colors Volume 3: Pacific & Home Front 1942-1947 - Specials series (6152)
Sample text
Are now almost universally used and generator output voltage can be controlled to within ± 1%. The regulators have negligible wattage loss and are unaffected by normal variations in ambient conditions. c. c. generators can be divided into three categories: 1. Direct self-excitation. 2. Indirect self-excitation. 3. Separately excited. c. 5). Correct field voltage depending on the load is supplied via a controlled rectifier. g. 2 s is obtainable. e. for machines of limited length. It is sometimes specified for higher ratings when fast response times are essential.
This implies that 600 A is being supplied to all the remaining feeders. If an overcurrent condition now arises on the first feeder which is not of sufficient magnitude to cause a significant depression of the busbar voltage, the remaining feeders will continue to draw load current. Consequently, the generator circuit breaker will always be carrying 600 A more than the feeder, and it would not be correct to compare the time-current characteristics of the two devices directly. 34 Protection and discrimination However, it is possible to allow for this condition by first drawing the actual feeder fuse or breaker characteristic and then constructing a second curve on which each point at a particular operating time is displaced by adding 600 A.
At unity power factor the voltage drop is caused by stator resistance and by distortion of the flux path. With lagging power factors there is a further loss of voltage caused by stator leakage reactance, and by the fact that a component of the stator magnetomotive force has a directly demagnetizing action. f. the greater these effects will become. 8 power factor will be of the order of 65-75%, assuming constant excitation. f. conditions. f. f. gets worse more and more excitation is required, thus increasing the amount of heat dissipated in the field windings.
