Synchronous machines Concordance
Synchronous machines
Section titled “Synchronous machines”Concordance status: generated from processed OCR/PDF text. Treat these as source-location aids until each passage is checked against the scan.
141 hits
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10 sources
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52 sections
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Matched Aliases
Section titled “Matched Aliases”Synchronous machines, synchronous-machines
Source Distribution
Section titled “Source Distribution”| Source | Hits | Sections |
|---|---|---|
| Theoretical Elements of Electrical Engineering | 44 | 22 |
| Investigation of Some Trouble in the Generating System of the Commonwealth Edison Co. | 34 | 3 |
| Theory and Calculation of Electric Circuits | 18 | 5 |
| Theory and Calculation of Electric Apparatus | 16 | 8 |
| General Lectures on Electrical Engineering | 10 | 3 |
| Theory and Calculation of Alternating Current Phenomena | 7 | 3 |
| Engineering Mathematics: A Series of Lectures Delivered at Union College | 4 | 2 |
| Theory and Calculation of Transient Electric Phenomena and Oscillations | 3 | 2 |
| Elementary Lectures on Electric Discharges, Waves and Impulses, and Other Transients | 3 | 2 |
| Elementary Lectures on Electric Discharges, Waves and Impulses, and Other Transients | 2 | 2 |
Section Hits
Section titled “Section Hits”Representative Source Snippets
Section titled “Representative Source Snippets”Report Record 4: Record of Four Troubles - 22 hit(s)
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... are no power limiting reactors between Fisk B and North- west Station, and the six tie cables between these stations are of very low resistance, the Northwest Station was just as seriously affected as Fisk B, and indeed acted like a part of Fisk B. b) All the synchronous machines on Fisk Street B, and on North- west Station dropped out, and many synchronous machines on Fisk A and Quarry Street: 44 synchronous machines on Fisk B and 18 on Northwest are recorded as shut down. Of 26 machines on Fisk A, 12 dropped out and 14 stayed in; of ...Chapter 13: Reactance Of Synchronous Machines - 10 hit(s)
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CHAPTER XIII REACTANCE OF SYNCHRONOUS MACHINES 119. The synchronous machine — ^alternating-current generator, synchronous motor or synchronous condenser — consists of an armature containing one or more electric circuits traversed by alternating currents and synchronously revolving relative to a uni ...Mathematical Appendix 5: Appendix: Synchronous Operation - 7 hit(s)
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... io = 3900 A. p = 8300KW. so =-82%. As seen, the calculated value of the terminal voltage of Quarry Street, 6600, agrees as closely with the observed value of 6800 V. as can be expected from such approximated calculations, especially when considering that some synchronous machines had been lost by Quarry Street in the substations, and the load thereby reduced, which would result hi an increase of voltage. As the total impedance of Fisk Street A is about 1.1, and it is connected to Quarry Street by x=1.75, the voltage of Fisk Street A s ...Apparatus Section 1: Synchronous Machines: General - 6 hit(s)
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I. General 3. The most important class of alternating-current apparatus consists of the synchronous machines. They comprise the alternating-current generators, single-phase and polyphase, the synchronous motors, the phase compensators, the phase con- verters, the phase balancers, the synchronous boosters and the exciters of induction gen ...Report Section 3: Discussion of Recommendations - 5 hit(s)
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... ower be- tween the station sections. Thus if in a station section as Fisk Street A, which is connected by one power limiting reactor to the rest of the system, full load of 60,000 KW is suddenly thrown off as by a short circuit at the busbars dropping out the synchronous machines in the substations while full steam supply is still on, the synchronizing power coming over the power limiting reactor is insufficient to hold the station in step, and the station breaks synchronism and speeds up. Whether synchronous operation is preserved or ...Lecture 9: Hunting Of Synchronous Machines - 5 hit(s)
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NINTH LECTURE HUNTING OF SYNCHRONOUS MACHINES C"^ROSS currents can flow between alternators due to dif- ferences in voltage, that is, differences in excitation; ■—^ and due to differences in phase, that is, differences in position of their rotors. Cross currents due to differences in excitation a ...Apparatus Introduction 21: Introduction - 5 hit(s)
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... and between electric and mechanical power. 1st. Commutating machines, consisting of a magnetic field and a closed-coil armature, connected with a multi-segmental commutator. 121 122 ELEMENTS OF ELECTRICAL ENGINEERING 2d. Synchronous machines, consisting of a undirectional mag- netic field and an armature revolving relatively to the mag- netic field at a velocity synchronous with the frequency of the alternating-current circuit connected thereto. . 3d. Rectifying ap ...Chapter 35: Balanced Symmetrical Polyphase Systems - 5 hit(s)
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... voltage, eo = 52,100 X \/3 = 90,000 volts; voltage drop in line, = 11.1 per cent. 305. Balanced polyphase systems thus can be calculated as single-phase systems, and this has been done in man}^ preceding chapters, as in those on the induction machines, synchronous machines, etc., that is, apparatus which is usually operated on polyphase circuits. BALANCED SYMMETRICAL POLYPHASE SYSTEMS 453 Only in dealing with those phenomena which are resultants of all the phases of the polyphase system, in the resolution of the polypha ...Lecture 6: Higher Harmonics Of The Generator Wave - 4 hit(s)
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... ccur between the line capacity and the circuit inductance. The origin and existence of higher harmonics therefore bears investigation in transformers, transmlission lines and cable systems. ORIGIN OF HIGHER HARMONICS Higher harmonics may originate in synchronous machines, as generators, synchronous motors and converters, and in transformers. These two classes of higher harmonics are very different. The former have constant potential character; the latter, con- stant current character; their cure and prevention there- f ...Apparatus Section 9: Synchronous Machines: Magnetic Characteristic or Saturation Curve - 4 hit(s)
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... r knee, and a saturated part beyond the knee. Gener- ally the change from the unsaturated to the over-saturated por- tion of the curve is more gradual; thus the knee is less pronounced in the magnetic characteristic of the synchronous machines, since the different parts of the magnetic circuit approach saturation successively. The dependence of the terminal voltage upon the field excita- tion, at constant full-load current through the amature into a 148 ELEMENT ...Chapter 7: Numerical Calculations - 3 hit(s)
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... tems, calculating the discharge capacity of lightning arres- ters, etc., the magnitude of the quantity is often sufficient. In 254 ^ ENGINEERING MATHEMATICS. calculating the critical speed of turbine alternators, or the natural period of oscillation of synchronous machines, the same applies, since it is of importance only to see that these speeds are sufficiently^ remote from the normal operating speed to give no trouble in operation. (b) Approximate calculation, requiring an accuracy of one or a few per cent only; a larg ...Apparatus Section 8: Synchronous Machines: Characteristic Curves of Synchronous Motor - 3 hit(s)
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... current I and power-factor p. As iron loss is assumed 3000 watts, as friction 2000 watts. Such curves are called load characteristics of the synchronous motor. 18. In Fig. 68 are shown, with constant power output = PO, SYNCHRONOUS MACHINES 145 i (Ep — ir), and the same constants, r = 0.1, XQ = 5, E = 1000, and with the nominal counter-generated voltage E0, that is, field excitation FQ, as abscissas, the values of current / for the four conditions, ...Apparatus Section 17: Synchronous Machines: Short-circuit Currents of Alternators - 3 hit(s)
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... time — occasionally several seconds — elapses before the armature reaction becomes effective. At short circuit, the magnetic field flux is greatly reduced by the demagnetizing action of the armature current, and the gen- SYNCHRONOUS MACHINES 161 erated e.m.f. thereby reduced from the nominal value EQ to the virtual value Ez; the latter is consumed by the armature self- inductive impedance z, or self-inductive reactance, which is practically the same in most c ...Chapter 16: Reaction Machines - 3 hit(s)
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CHAPTER XVI REACTION MACHINES 147. In the usual treatment of synchronous machines and induction machines, the assumption is made that the reactance, x, of the machine is a constant. While this is more or less approximately the case in many alternators, in others, especially in machines of large armature reaction, the reactance, x, is ...Chapter 24: Conclusion - 3 hit(s)
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... -used types of apparatus have been discussed in the preceding, and a comprehensive list of them is given in Chapter XXIII, together with their definitions and short characterization. While electric machines are generally divided into induction machines, synchronous machines and commutating machines, this classification becomes difficult in considering all known apparatus, as many of them fall in two or even all three classes, or are intermediate, or their inclusion in one class depends on the particular definition of this cl ...Chapter 11: Instability Of Circuits: Induction And Syn Chronous Motors - 3 hit(s)
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... d to speed and electric supply, is rare. It has been observed, especially in single-phase motors, in cases of considerable oversaturation of the magnetic circuit. Oscillatory instability, however, is typical of the synchronous machine, and the hunting of synchronous machines has probably been the first serious problem of cimiulative oscillations in electric circuits, and for a long time has limited the industrial use of syn- chronous machines, in its different forms: (a) Difficulty and failure of alternating-current generato ...Lecture 10: Continual And Cumulative Oscillations - 2 hit(s)
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... nstrumental in the energy supply to other systems of continual oscillation. Thus, for instance, the hysteresis cycle between synchronizing force and position displacement supplies the energy of the con- tinual or cumulative oscillation, called hunting, in synchronous machines, as alternators, synchronous motors and converters. The mechanism, by which the hysteresis cycle supplies the energy of continual oscillations, has been investigated in the case of the hunting of synchronous machines,* but is still practically un- known i ...Apparatus Section 3: Synchronous Machines: Armature Reaction - 2 hit(s)
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... a synchronous motor with the magnetic attractions and repulsions between field and armature). In this case the armature current neither magnetizes nor demag- netizes the field as a whole, but magnetizes the one side, demag- SYNCHRONOUS MACHINES 131 netizes the other side of each field pole, and thus merely distorts the magnetic field. 9. If the armature current lags behind the nominal generated e.m.f., it reaches its maximum in a position where the armature ...