Apparatus Section 15: Synchronous Machines: Fluctuating Cross Currents in Parallel Operation
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Source Metadata
Section titled “Source Metadata”| Field | Value |
|---|---|
| Source | Theoretical Elements of Electrical Engineering |
| Year | 1915 |
| Section ID | theoretical-elements-electrical-engineering-section-36 |
| Location | lines 9918-10123 |
| Status | candidate |
| Word Count | 1491 |
| Equation Candidates In Section | 0 |
| Figure Candidates In Section | 0 |
| Quote Candidates In Section | 0 |
Opening Source Excerpt
Section titled “Opening Source Excerpt”XV. Fluctuating Cross Currents in Parallel Operation 27. In alternators operated from independent prime movers, it is not sufficient that the average frequency corresponding to the average speed of the prime movers be the same, but still more important that the frequency be the same at any instant, that is, that the frequency (and thus the speed of the prime mover) be constant. In rotary prime movers, as turbines or electric motors, this is usually the case; but with reciprocating machines, as steam engines, the torque and thus the speed of rotation rises and falls periodically during each revolution, with the frequency of the engine impulses. The alternator con- nected with the engine will thus not have uniform frequency, but a frequency which pulsates, that is, rises and falls. The amplitude of this pulsation dependsSource-Located Theme Snippets
Section titled “Source-Located Theme Snippets”Radiation / light
Section titled “Radiation / light”XV. Fluctuating Cross Currents in Parallel Operation 27. In alternators operated from independent prime movers, it is not sufficient that the average frequency corresponding to the average speed of the prime movers be the same, but still more important that the frequency be the same at any instant, that is, that the frequency (and thus the speed of the prime mover) be constant. In rotary prime ...Impedance / reactance
Section titled “Impedance / reactance”... rs out of synchro- nism with each other, especially when the conditions are favorable to a cumulative increase of this effect by what may be called mechanical resonance (hunting) of the engine governors, etc. They depend upon the synchronous impedance of the alternators and upon their phase difference, that is, the number of poles and the fluctuation of speed, and are specially objectionable when operating synchronous apparatus in the system. 28. Thus, for instance, if two 80-pole altern ...Field language
Section titled “Field language”... the problem of parallel operation is made more difficult by the more jerky nature of the gas-engine ^ 73._Phase displacement between impulse. In such machines, alternators to be synchronized, therefore, squirrel-cage wind- ings in the field-pole faces are commonly used, to assist synchron- izing by the currents induced in this short-circuited winding, on the principle of the induction machine. From Fig. 73 it is seen that the e.m.f. OEr or EiE2, which causes the cross current ...Dielectricity / capacity
Section titled “Dielectricity / capacity”... of its mean posi- tion by 1/4 per cent, of 20 or 1/20 pole, that is, 180/20 = 9 elec- trical space degrees. If the armature of the other alternator at this moment is behind its average position by 9 electrical space degrees, the phase displacement between the alternator e.m.fs. is 18 electrical time degrees; that is, the alternator e.m.fs. are represented by OEi and OEZ in Fig. 71, and when running in parallel the e.m.f. OEf = E\E^ is short circuited through the synchronous impedanc ...Chapter-Local Concept Hits
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Modern Engineering Reading Prompts
Section titled “Modern Engineering Reading Prompts”- Radiation / light: Compare the chapter’s radiation vocabulary with modern electromagnetic radiation, spectral frequency, wavelength, absorption, and illumination engineering.
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