Short Circuit Concordance
Short Circuit
Section titled “Short Circuit”Concordance status: generated from processed OCR/PDF text. Treat these as source-location aids until each passage is checked against the scan.
667 hits
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13 sources
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95 sections
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Matched Aliases
Section titled “Matched Aliases”Short circuit, short circuit, short circuits, short-circuit, short-circuits
Source Distribution
Section titled “Source Distribution”| Source | Hits | Sections |
|---|---|---|
| Theory and Calculation of Electric Apparatus | 139 | 12 |
| Theory and Calculation of Transient Electric Phenomena and Oscillations | 99 | 11 |
| Theoretical Elements of Electrical Engineering | 72 | 15 |
| Elementary Lectures on Electric Discharges, Waves and Impulses, and Other Transients | 71 | 4 |
| Elementary Lectures on Electric Discharges, Waves and Impulses, and Other Transients | 66 | 4 |
| General Lectures on Electrical Engineering | 63 | 8 |
| Investigation of Some Trouble in the Generating System of the Commonwealth Edison Co. | 46 | 3 |
| Theory and Calculation of Electric Circuits | 46 | 10 |
| Theory and Calculation of Alternating Current Phenomena | 32 | 10 |
| Theory and Calculation of Alternating Current Phenomena | 13 | 7 |
| Theory and Calculation of Alternating Current Phenomena | 11 | 6 |
| Engineering Mathematics: A Series of Lectures Delivered at Union College | 6 | 3 |
| Radiation, Light and Illumination | 3 | 2 |
Section Hits
Section titled “Section Hits”Representative Source Snippets
Section titled “Representative Source Snippets”Chapter 20: Single-Phase Commutator Motors - 87 hit(s)
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... f. in the revolving armature conductors, which gives the motor output; the armature reaction, that is, the mag- net k Mux produced by the armature current, distorts and weakens the field, and requires a shifting of the brushes to avoid Bparldag due to the short-circuit current under the commutator brushes, and where the brushes can not l>e shifted, as in a reversible motor. this necessitates the use of a strong field and weak armature to keep down the magnetic flux at the brushes. In the alternating- current motor the m ...Lecture 4: Single-Energy Transients In Alternating Current Circuits - 63 hit(s)
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... tray field (self-inductive reactance), etc., of the apparatus, resulting from the air gap in the magnetic circuit. 19. As instance of the use of the single-energy transient in engineering calculations may be considered the investigation of the momentary short-circuit phenomena of synchronous alter- nators. In alternators, especially high-speed high-power ma- chines as turboalternators, the momentary short-circuit current may be many times greater than the final or permanent short- circuit current, and this excess curr ...Lecture 4: Single-Energy Transients In Alternating Current Circuits - 58 hit(s)
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... tray field (self-inductive reactance), etc., of the apparatus, resulting from the air gap in the magnetic circuit. 19. As instance of the use of the single-energy transient in engineering calculations may be considered the investigation of the momentary short-circuit phenomena of synchronous alter- nators. In alternators, especially high-speed high-power mar chines as turboalternators, the momentary short-circuit current may be many times greater than the final or permanent short- circuit current, and this excess curr ...Chapter 14: Short-Circuit Currents Of Alternators - 48 hit(s)
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CHAPTER XIV. SHORT-CIRCUIT CURRENTS OF ALTERNATORS. 112. The short-circuit current of an alternator is limited by armature reaction and armature self-inductance; that is, the current in the armature represents a m.m.f. which with lagging current, as at short circuit, is demagnetiz ...Apparatus Section 17: Synchronous Machines: Short-circuit Currents of Alternators - 35 hit(s)
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XVII. Short-circuit Currents of Alternators 31. The short-circuit current of an alternator at full-load excitation usually is from two to five times full-load current, and even less in very large high-speed steam turbine alternators. It is w ...Chapter 15: Synchronous Rectifier - 31 hit(s)
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... cycle supply. Single-phase synchronous motors were started by such recti- fying commutators through which the field current passed, in series with the armature, and the first long-distance power trans- o Fio. 79. — Open-circuit rectifier. Fig. 80. — Short-circuit rectifier. mission in America (Telluride) was originally operated with single-phase machines started by rectifying commutator — the commutator, however, requiring frequent renewal. 139. The reversal of connection between the rectified circuit and the s ...Lecture 17: Arc Lighting - 27 hit(s)
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... curve I — then any tendency of the current to increase — as by a momentary drop of the arc resistance — would lower the required arc voltage, and so increase the cur- rent, at constant supply voltage, hence still further lower the arc voltage, etc., and a short circuit would result. Vice versa, a momentary decrease of arc current, by requiring more volt- age than is available, would still further decrease the current, increase the required voltage, etc., and the arc would extin- guish. Therefore only such apparatus is ...Chapter 6: Magnetism - 26 hit(s)
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... mechanical forces. In the large appara- tus, operating in the modern, huge, electric generating systems, these mechanical forces due to magnetic fields may, however, especially imder abnormal, though not infrequently occurring, conditions of operation (as short-circuits), assume such formi- dable values, so far beyond the normal mechanical strains, as to re- quire consideration. Thus generators and large transformers on big generating systems have been torn to pieces by the magnetic mechanical forces of short-circuits, c ...Report Section 2: Recommendations - 17 hit(s)
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... the size of the system and especially due to the increasing interconnection of substations by tie cables. While such interconnection materially increases the economy in the use of the cables, it also increases the severity and extent of local troubles such as short circuits. Further- more, many of the controlling devices are not new any more. While it is economically not feasible to replace or remodel the con- trolling devices every few years with every advance of the art, it probably is economically feasible to do so with regar ...Chapter 22: Armature Reactions Of Alternators - 17 hit(s)
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... usts itself only gradually to the change of circuit conditions, at a rate of speed depending upon the constants of the field-exciting circuit, etc. The extreme case hereof takes place when suddenly short- circuiting an alternator; at the first moment the short-circuit current is limited only by the self-inductance, and the magnetic field still has full strength, the field-exciting current has greatly increased by the e.m.f. generated in the field circuit by the arma- ture reaction. Gradually the field-exciting current ...Chapter 9: Inductive Discharges - 17 hit(s)
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... circuit section of high inductance and small resistance and negligible capacity and conductance, as a generating station, with a circuit of distributed capacity and inductance, as a transmission line. The extreme case of such a discharge would occur if a short circuit at the busbars of a gen- erating station opens while the transmission line is connected to the generating station. Let r = the total resistance and L = the total inductance of the inductive section of the circuit; also let g = 0, C= 0, and L0 = inductan ...Report Record 4: Record of Four Troubles - 16 hit(s)
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... rs stated to be 1.75 ohms each, between Fisk A and Quarry Street, and between Quarry Street and Fisk B, and six tie cables of negligible reactance and about .3 ohms joint resistance between Fisk B and the Northwest Station. 1.) Sept. 18th, 19193:47 P. M. a) A short circuit close to the busbars of B section of Fisk Street held on for several seconds, before it was opened. As there 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 N ...Report Section 3: Discussion of Recommendations - 13 hit(s)
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... uld greatly reduce the frequency of troubles or keep them out of the generating system by isolating or localizing them by the feeder reactors, it obviously is not possible to absolutely guard against the occasional troubles in the generating sys- tem, such as short circuits. But as soon as the trouble is cleared as by the opening of the circuit breakers, in a second or a few seconds, the system should immediately return to normal, and to begin to pick up again the load which the short circuit dropped. The most serious feature of ...Chapter 8: Low Frequency Surges In High Potential Systems - 12 hit(s)
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... ful in their weakening action on the insulation and the possibility of their starting a low frequency surge. The former ones only are considered in the present chapter. Their causes may be manifold, — changes of circuit conditions, as starting, opening a short circuit, existence of a flaring arc on the system, etc. In the circuit from the generating system to the capacity of the transmission line or the underground cables, we have always r2 < —j-; that is, the phenomenon is always oscillatory, and (_/ equations (2 ...Lecture 8: Generation - 10 hit(s)
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... armature reaction considered, but which is increased to allow for the self-induction. The last way (armature reaction), is used in designing machines; the second way (synchronous reactance) in calcula- tions with machines and systems. In the momentary short circuit current of alternators, however, the armature reaction and the self-induction must be considered separately, since they act differently. In the moment of short circuiting an alternator, the self- induction acts immediately in limiting the current, but no ...Chapter 14: Phase Conversion And Single-Phase Generation - 9 hit(s)
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... ^ im. X Fia. 68. — Resist ance-inductance monocyclic square, regulation curve. For: q = 0, that is, non-inductive load, the voltage diagram is a curve shown by circles in Fig. 67, for 0, 2, 4, 6, 8 and 10 amp. load, the latter being the maximum or short-circuit value. For q = p, or a load of 45° load, the voltage diagram is the straight line shown by crosses in Fig. 67. That is, in this case, the monocyclic voltage, eB, is in quadrature with the supply voltage, 220 ELECTRICAL APPARATUS f,;it ;ill toads, ...Lecture 14: Alternating Current Railway Motor - 8 hit(s)
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... the turn short circuited under the brush by its rotation through the magnetic field. As this field, however, is alternating, an e. m. f. is induced in the short circuited turn by the alternations of the lines of magnetic force enclosed by it, and causes a short circuit current and in that way, sparking. This e. m. f., being due to the alternation of the enclosed field flux, is independent of the speed of rotation ; it also exists with the motor at a standstill, and is a maximum in the armature turn under the brush, as t ...Apparatus Section 5: Alternating-current Transformer: Short-circuit Current - 8 hit(s)
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V. Short-circuit Current 120. If a short circuit occurs at the secondary terminals of a transformer, and the power supply at the primary is sufficient to maintain the primary terminal voltage, the primary and second- ary currents of the t ...