Power Factor Concordance
Power Factor
Section titled “Power Factor”Concordance status: generated from processed OCR/PDF text. Treat these as source-location aids until each passage is checked against the scan.
671 hits
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11 sources
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101 sections
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Matched Aliases
Section titled “Matched Aliases”power factor, power-factor, wattless component, wattless current
Source Distribution
Section titled “Source Distribution”| Source | Hits | Sections |
|---|---|---|
| Theory and Calculation of Electric Apparatus | 206 | 14 |
| Theory and Calculation of Alternating Current Phenomena | 133 | 18 |
| Theory and Calculation of Alternating Current Phenomena | 89 | 14 |
| Theoretical Elements of Electrical Engineering | 83 | 24 |
| Theory and Calculation of Electric Circuits | 54 | 5 |
| Theory and Calculation of Alternating Current Phenomena | 39 | 12 |
| Theory and Calculation of Transient Electric Phenomena and Oscillations | 35 | 5 |
| Engineering Mathematics: A Series of Lectures Delivered at Union College | 18 | 2 |
| General Lectures on Electrical Engineering | 11 | 4 |
| Investigation of Some Trouble in the Generating System of the Commonwealth Edison Co. | 2 | 2 |
| Radiation, Light and Illumination | 1 | 1 |
Section Hits
Section titled “Section Hits”Representative Source Snippets
Section titled “Representative Source Snippets”Chapter 20: Single-Phase Commutator Motors - 64 hit(s)
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... resistance, which represents the power loss. In addition thereto, in the alternating-cur rent motor voltage is consumed by the inductance, which is wattless or reactive and therefore causes a lag of current behind the vol- tage, that is, a lowering of the power-factor. While in the direct- current motor good design requires the combination of a strong field and a relatively weak armature, so as to reduce the armature reaction on the field to a minimum, in the design of the alter- iiatiiig-current motor considerations o ...Chapter 4: Induction Motor With Secondary Excitation - 50 hit(s)
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... ating magnetizing current is a wattless reactive current, the result is, that the alternating-current input into the induction motor is always lagging, the more so, the larger a part of the total current is given by the magnetizing current. To secure good power-factor in an induction motor, the magnetizing current, that i«, the current which produces the magnetic field flux, must be kept as small as possible. This means as small an air gap between stator and rotor as mechanic- ally permissible, and as large a number of ...Chapter 14: Constant-Potential Constant-Current Trans Formation - 42 hit(s)
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... n series with this circuit. The impedance of this circuit then is Z = r + jxof and, absolute, and thus the current, / = ^* = -^ (1) ^ r + jxo and the absolute value is eo Co the phase angle of the supply circuit is given by (2) and the power factor. tan ^0 = - (3) T cos ^0 = -• (4) z ^ ^ If in this case, r is small compared with Xq, it is ,-^£o _-l (5) Xo ' ^* xM¥" or, expanded by the binomial theorem. V • • • \xj hence, : (6) 6o I = — Xo 2xo2^8xo* -r . . . ...Chapter 16: Induction Motor - 28 hit(s)
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... e the motor is in operation. 256 ALTERNATING-CURRENT PHENOMENA. Since, necessarily, ri<*, ''<•< and since the starting current is, approximately, 7 =f , we have, Ta < would be the theoretical torque developed at 100 per cent efficiency and power factor, by E.M.F., E0, and current, /, at synchronous speed. Thus, T0<T00, and the ratio between the starting torque T0, and the theo- retical maximum torque, T^, gives a means to judge the perfection of a motor regarding its starting torque. This ratio, T0 ...Chapter 23: Review - 24 hit(s)
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... change of the inductivity of the load, hasmade njGfl compounding unsuitahie for the modern high-power altcrnu- ton. Condenser Motor. — 77. Single-phase induction motor with condenser in tertiary circuit on stator, for producing shirting torque and high power-factor. The space angle between pri- mary and tertiary stator circuit usually is 45° to 60°, and often a three-phase motor is used, with single-phase supply on one phase. and condenser on a Becond phase. With the small amount of capacity, sufficient for power-fa ...Chapter 14: Dielectric Losses - 20 hit(s)
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... dielectric fields, but is so small, that it usually is overshadowed by the other losses. In alternating dielectric fields in solid materials, such as in condensers, coil insulation, etc., a loss is commonly observed which gives an approximately constant power-factor of the elec- tric energizing circuit, over a wide range of voltage and of fre- quency, from less than a fraction of 1 per cent, up to a few per cent. 150 DIELECTRIC LOSSES 151 Constancy of the power-factor with the frequency, means that the loss is ...Chapter 24: Synchronous Motor - 20 hit(s)
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... e determined only in the case of the particular conditions of the installation under consideration. 227. H. Phase Characteristics of the Synchronous Motor. While an induction motor at constant impressed voltage is fully determined as regards to current, power-factor, efficiency, etc., by one independent variable, the load or output; in the synchronous motor two independent variables exist, load and field-excitation. That is, at constant impressed voltage the current, power-factor, etc., of a synchronous motor can at ...Chapter 2: Long-Distance Transmission Line - 20 hit(s)
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... — K<> ~IY (29) and hence, substituted in (22), / = and E = -° U~a/ (cos /?Z + y sin /?/) + Cs +aZ (cos /M - j sin /?Z) (30) 11. As an example, consider the problem of delivering, in a three-phase system, 200 amperes per phase, at 90 per cent power factor lag at 60,000 volts per phase (or between line and neutral) and 60 cycles, at the end of a transmission line 200 miles in length, consisting of two separate circuits in multiple, each consisting of number 00 B. and S. wire with 6 feet distance between the ...Apparatus Section 2: Induction Machines: Polyphase Induction Motor - 15 hit(s)
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... im- pressed e.m.f. EQ) enters in the equation of current, magnetism, etc., as a simple factor, in the equations of torque, power input and output, and volt-ampere input as square, and cancels in the equation of efficiency, power-factor, etc., it follows that the current, magnetic flux, etc., of an induction motor are propor- tional to the impressed e.m.f., the torque, power output, power input, and volt-ampere input are proportional to the square of the i ...Chapter 11: Phase Control - 15 hit(s)
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... ltage, e, is greatest if the current, /, is in phase with the voltage, e — less if the current is not in phase. Inductive reactance in series with the receiving circuit, e, at constant impressed e.m.f., eo, causes the voltage, e, to drop less with a unity power-factor current, 7, but far more with a lagging current, and causes the voltage, e, to rise with a leading current. While series resistance always causes a drop of voltage, series inductive reactance, x, may cause a drop of voltage or a rise of voltage, dependi ...Chapter 19: Induction Generators - 15 hit(s)
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... rom zero at synchronism up to a maximum point, and then decrease again, while the current constantly increases. 174. The induction generator differs essentially from the ordinary synchronous alternator in so far as the induction generator has a definite power-factor, while the synchronous alternator has not. That is, in the synchronous alternator the phase relation between current and terminal voltage entirely depends upon the condition of the external circuit. The in- duction generator, however, can operate only if ...Chapter 24: Symbolic Representation Of General Alternating Waves - 15 hit(s)
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... hus, regarding the wattless power as a whole, in the general alternating circuit no distinction can be made be- tween lead and lag, since some harmonics may be leading, others lagging. The apparent power, or total volt-amperes, of the circuit is, The power factor of the circuit is, The term "inductance factor," however, has no mean- ing any more, since the wattless powers of the different harmonics are not directly comparable. The quantity, ,...._ ... wattless power has no physical significance, and is not ...Apparatus Section 4: Induction Machines: Induction Generator - 14 hit(s)
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... load has obviously to be considered, that is, in the equations the reactance x0 has to be replaced by the reactance XQ (1 — s), otherwise the equa- tions remain the same. FIG. 187. — Induction generator load curves. 3. POWER-FACTOR OF INDUCTION GENERATOR 155. The induction generator differs 'essentially from a syn- chronous alternator (that is, a machine in which an armature revolves relatively through a constant or continuous magnetic field) by having ...Chapter 27: Symbolic Representation Of General Alternating Waves - 14 hit(s)
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... he general alternating circuit no distinction can be made between lead and lag, since some harmonics may be leading, others lagging. The apparent power, or total volt-amperes, of the circuit is P, = EI = JX2n-i{ej" + e„i022n-i(4i' + *V^'). \ 1 1 The power-factor of the circuit is, P^ 1 P =w = \ 1 1 The term "inductance factor," however, has no meaning any more, since the reactive powers of the different harmonics are not directly comparable. The quantity go = Vl — p^ , ,.,..„ , . reactive power has ...Chapter 19: Alternating- Current Motors In General - 13 hit(s)
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... ENT MOTORS 301 (II is the synchronous motor of the electrical industry. (2) and (3) are used occasionally to produce synchronous rotation without direct-current excitation, and of very great steadiness of the rate of rotation, where weight efficiency and power- factor are of secondary importance. (4) is used to some extent as frequency converter or alternating-current generator. (2) and (3) are occasionally observed in induction machines, and in the starting of synchronous motors, as a tendency to lock at some interme ...Chapter 1: Speed Control Of Induction Motors - 12 hit(s)
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... o calculate the motor characteristics for this varying resist- ance, r'l, we use the feature, that a change of the secondary re- sistance of the induction motor changes the slip, s, in proportion to the change of resistance, but leaves the torque, current, power- factor, torque efficiency, etc., unchanged, as shown on page 322 of "Theoretical Elements of Electrical Engineering." We .thus calculate the motor for constant secondary resistance, n, but otherwise the same constants, in the manner discussed on page 318 of "The ...Chapter 12: Frequency Converter Or General Alternating Current Transformer - 11 hit(s)
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... terminal voltage, tu with a four-cycle synchronous generator as exciter of the 60-cycle synchronous-induction generator, driven as frequency converter at 56 cycles. 1. For non-inductive load, or I, - i. (Curve I.) 2. For inductive load of 80 per cent, power-factor, or /i * 7(0.8 - 0.6 j). (Curve U.J 3. For anti-inductive load of 80 per cent, power-factor, or /, = 7(0.8 + O.Gj). (Curve III.) SYNCHRONOUS INDUCTION GENERATOR 205 For the constants: e„ - 2000 volts, Z, = 1 + 0.5 j, Zx = 0.1 + 0.3 j, Z„ = 0.5 + ...Apparatus Section 3: Induction Machines: Single -phase Induction Motor - 10 hit(s)
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... re Fig. 181 with Fig. 176 and to note the lesser drop of speed (due to the relatively lower secondary SLIP, S"= FIG. 182. — Three-phase induction motor on single-phase circuit, s curves. resistance) and lower power-factor and efficiencies, especially at light load. The maximum output is reduced from 3 X 7000 = 21,000 in the three-phase motor to 9100 watts in the single-phase motor. Since, however, the internal losses are less in the singl ...