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. 1919 Excerpt: ...of the line in Prob. 51 consists of motors and lamps operating in parallel. The lamps take altogether 100 kw. non-inductive. Calculate how many amperes are delivered to the motors, and at what power factor. Prob. 54-6. If the lamp load of Prob. 53 is suddenly removed from the line while the motors continue at the same ...
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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. 1919 Excerpt: ...of the line in Prob. 51 consists of motors and lamps operating in parallel. The lamps take altogether 100 kw. non-inductive. Calculate how many amperes are delivered to the motors, and at what power factor. Prob. 54-6. If the lamp load of Prob. 53 is suddenly removed from the line while the motors continue at the same current input, calculate: (a) What voltage at the station end of the line would now be required in order to keep the voltage at the motors unchanged at its former value of 2200 volts? (6) To what value will the voltage at the motors rise if the station voltage remains at the value calculated in Prob. 51? Prob. 56-6. (a) If to a load having a power factor of 0.60 a non-inductive load of 20 per cent of this amount (kv-a.) be added, what is the resultant power factor? (6) If to a load having a power factor of 0.90 a non-inductive load of 20 per cent of this amount (kv-a.) be added, what is the resultant power factor? (c) What conclusions can you draw from a comparison of the results of parts (a) and (6)? CHAPTER VII POLYPHASE CIRCUITS Thus far we have considered single-phase alternatingcurrent power only. Because of the several decided advantages which polyphase systems possess, they are in general use where large quantities of power are utilized. It is necessary, therefore, to make a special study of these systems. 55. Distinction Between Single-phase and Polyphase Systems. Single-phase. In a single-phase system power is obtained from a single set of armature or transformer windings or the equivalent. This system is much like a direct-current system. The power may be distributed as in a direct-current system, by two or three wires. When three wires are used, the voltage between one outside wire and the neutral is in phase with the voltage betwee...
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Add this copy of Essentials of Alternating Currents to cart. $61.87, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2010 by Nabu Press.
Add this copy of Essentials of Alternating Currents to cart. $68.07, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2016 by Palala Press.
