Impedance Concordance
Impedance
Section titled “Impedance”Concordance status: generated from processed OCR/PDF text. Treat these as source-location aids until each passage is checked against the scan.
1324 hits
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13 sources
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154 sections
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Matched Aliases
Section titled “Matched Aliases”impedance, impedances
Source Distribution
Section titled “Source Distribution”| Source | Hits | Sections |
|---|---|---|
| Theory and Calculation of Alternating Current Phenomena | 313 | 28 |
| Theory and Calculation of Electric Apparatus | 255 | 12 |
| Theory and Calculation of Alternating Current Phenomena | 243 | 23 |
| Theory and Calculation of Alternating Current Phenomena | 170 | 19 |
| Theoretical Elements of Electrical Engineering | 160 | 30 |
| Theory and Calculation of Transient Electric Phenomena and Oscillations | 59 | 18 |
| Theory and Calculation of Electric Circuits | 45 | 7 |
| Engineering Mathematics: A Series of Lectures Delivered at Union College | 22 | 3 |
| Investigation of Some Trouble in the Generating System of the Commonwealth Edison Co. | 22 | 2 |
| Elementary Lectures on Electric Discharges, Waves and Impulses, and Other Transients | 14 | 4 |
| Elementary Lectures on Electric Discharges, Waves and Impulses, and Other Transients | 13 | 4 |
| General Lectures on Electrical Engineering | 7 | 3 |
| Radiation, Light and Illumination | 1 | 1 |
Section Hits
Section titled “Section Hits”Representative Source Snippets
Section titled “Representative Source Snippets”Chapter 17: The Alternating-Current Transformer - 45 hit(s)
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... transformer depends upon the primary e.m.f., which dependence can be represented by an admittance, the "primary admittance," Fo = g^i — jbo, of the transformer. The resistance and reactance of the primary and the secondary circuit are represented in the impedance by Zo = To + jxo, and Zi = ri + jxi. Within the limited range of variation of the magnetic density in a constant-potential transformer, admittance and impedance can usually, and with sufficient exactness, be considered as constant. Let no = number ...Chapter 5: Single-Phase Induction Motor - 44 hit(s)
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... hus is proportional to the quadrature flux. At synchronism, the quadrature magnetic flux produced by the armature currents becomes equal to the main magnetic flux produced by the impressed single-phase voltage (approximately, in reality it is less by the impedance drop of the exciting current in the armature conductors) and the magnetic disposition of the single-phase induction motor thus becomes at synchronism iden- tical with that of the polyphase induction motor, and approxi- mately so near synchronism. The ma ...Chapter 16: Induction Motor - 42 hit(s)
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... em ; if r^ = secondary resistance per circuit, rt = a2 r{ = secondary resistance per circuit reduced to primary system ; if x± = secondary reactance per circuit, xt = a2 x\ = secondary reactance per circuit reduced to primary system ; if £/ = secondary impedance per circuit, z1 = azz\ = secondary impedance per circuit reduced to primary system ; that is, the number of secondary circuits and of turns per secondary circuit is assumed the same as in the primary system. In the following discussion, as secondary q ...Chapter 19: Alternating- Current Motors In General - 39 hit(s)
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... it, r', consumes an e.n r'(, in phase with the current, and the total or effective resistance of the circuit is, therefore, r = r' + r", and the total e.m.f. consumed by the circuit, or the impressed e.m.f.. is: E = (r+jx)I = Z{, .where : Z = r + jx = impedance, in vector denotation, z = Vr* + i* = impedance, in absolute terms. If an electric circuit is in inductive relation to another electa circuit, it is advisable to separate the inductance, L, of the cir- ALTERNATING-CURRENT MOTORS 303 cuit in two parts ...Chapter 4: Induction Motor With Secondary Excitation - 37 hit(s)
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... As illustration is shown in Fig. 20 the load curve of a typical 100-hp. 60-cycle 80-polar induction motor (90 revolutions per minute) of the constants: Impressed voltage: ea = 500. Primary exciting admittance: Ya = 0.02 — 0.6 j. Primary self-inductive impedance: Zu = 0.1 + 0.3j. Secondary self-inductive impedance: Zi = 0.1 + 0.3 j. INDUCTION MOTOR 53 As seen, at full-load of 75 kw. output, the efficiency is 80 per cent., which is fair for a slow-speed motor. But the power-factor is 55 per cent., the ap ...Chapter 12: Frequency Converter Or General Alternating Current Transformer - 33 hit(s)
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... air gap in the magnetic circuit, to permit movability between primary and secondary, and thus they require a higher magnetizing current than the closed magnetic circuit stationary transformer, and this again results in general in a higher self- inductive impedance. Thus, the frequency converter and in- duction motor magnetically represent transformers of high ex- citing admittance and high self-inductive impedance. 104. The mutual magnetic flux of the transformer is pro- duced by the resultant m.m.f. of both elect ...Chapter 20: Single-Phase Commutator Motors - 33 hit(s)
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... he secondary circuit, as shown by the transformer diagram, Fig. 166. Herefrom it follows that: In the inductively compensated series motor, 2, the quad- rature flux is very small and practically negligible, as very little voltage is consumed in the low impedance of the secondary cir- cuit, C; whatever flux there is, lags behind the main flux. 346 ELECTRICAL APPARATUS In the inductively compensated series ipotor with secondary excitation, or inverted repulsion motor, 3, the quadrature flux, $1, is quite la ...Chapter 24: Synchronous Motor - 32 hit(s)
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... hod, we may in the following, as an example of the graphical method, treat the action of the synchronous motor graphically. Let an alternator of the e.m.f., Ei, be connected as synchron- ous motor with a supply circuit of e.m.f., Eo, by a circuit of the impedance, Z. If £"0 is the e.m.f. impressed upon the motor terminals, Z is the impedance of the motor of generated e.m.f., Ei. If Eq is the e.m.f. at the generator terminals, Z is the impedance of motor and line, including transformers and other intermediate appa ...Chapter 14: The Alternating-Current Transformer - 32 hit(s)
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... transformer depends upon the primary E.M.F., which dependance can be rep- resented by an admittance, the " primary admittance," °f tne transformer. Fig. 105. The resistance and reactance of the primary and the secondary circuit are represented in the impedance by Z0=r0- jx0, and Zl=rl- j xl . Within the limited range of variation of the magnetic density in a constant potential transformer, admittance and impedance can usually, and with sufficient .exactness, be considered as constant. Let n0 = number of ...Apparatus Section 3: Induction Machines: Single -phase Induction Motor - 27 hit(s)
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... main magnetic flux plus the current producing in the secondary the exciting current of the cross magnetic flux. In reality it is slightly less, especially in small motors, due to the drop of voltage in the self-inductive impedance and the drop of quadrature mag- netic flux below the impressed primary magnetic flux caused thereby. In the secondary at synchronism this secondary exciting current is a current of twice the primary frequency; at any other ...Chapter 13: Ths Alternating^Cnrrent Traxsfobmer - 26 hit(s)
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... s upon the primary K.M.K., which dcpendance can be rc|> resented by an admittance, the " primary admittance," Y^=^ g^ ■\- j b^, of the transformer. rig. 9B. The resistance and reactance of the primary and the secondary circuit are represented in the impedance by ^u = r^ —j^ut and Z| = r, —Jx\- Within the limited range of variation of the magnetic density in a constant [iotential transformer, admittance and impedance can usually, and with sufficient exactness, be considered as constant. Let «„ = number of pr ...Chapter 19: Synchronous Motor - 25 hit(s)
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... we may in the following, as an instance of the graphical method, treat the action of the synchronous motor diagrammatically. Let an alternator of the E.M.F., E±, be connected as synchronous motor with a supply circuit of E.M.F., EQ, by a circuit of the impedance Z. If E0 is the E.M.F. impressed upon the motor termi- nals, Z is the impedance of the motor of induced E.M.F., E±. If E0 is the E.M.F. at the generator terminals, Z is the impedance of motor and line, including transformers and other intermediate appar ...Chapter 16: Il - 24 hit(s)
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... we may in the following, as an instance of the graphical method, treat the action of the synchronous motor diagrammatically. Let an alternator of the E.M.F., E^, be connected as synchronous motor w^ith a supply circuit of E.M.F., E^y by a circuit of the impedance Z, If E^ is the E.M.F. impressed upon the motor termi- nals, Z is the impedance of the motor of induced E.M.F., E^. If E^ is the E.M.F. at the generator terminals, Z is the impedance of motor and line, including transformers and other intermediate appar ...Chapter 6: Induction-Motor Regulation And Stability - 23 hit(s)
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... us, if the voltage at the primary terminals of the motor transformer is constant, and such as to give the rated motor voltage at full-load, at no- load the voltage at the motor terminals is higher, but at overload lower by the voltage drop in the internal impedance of the trans- formers. If the voltage is kept constant in the center of distri- bution, the drop of voltage in the line adds itself to the imped- ance drop in the transformers, and the motor supply voltage thus varies still more between no-load and overlo ...Mathematical Appendix 5: Appendix: Synchronous Operation - 21 hit(s)
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... / (1) and the resultant voltage in the circuit between the alternators then is : e = ei e 2 = E cos \ (<f> co) cos (</>+ co) [ = 2E sin co sin (2) and the interchange currentwbeteen the alternators is: 2E . i = sin co sin (<j> a) (3) where: z = r2+x 2 is the impedance of the circuit between the two alternators, and the phase angle a is given by: x tan a = - r and: r= resistance x = reactance of the circuit between the alternators (including their internal resistances and reactances). [[END_PDF_PAGE:28]] [[PDF_PAGE:29]] Re ...Chapter 20: Single-Phase Induction Motors - 21 hit(s)
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... duced either by some outside e.m.f., as in the monocyclic starting device, or by displacing the circuits of two or more primary coils from each other, either by mutual induc- tion between the coils — that is, by using one as secondary to the other — or by impedances of different inductance factors connected with the different primary coils. 178. The starting devices of the single-phase induction motor by producing a quadrature magnetic flux can be subdivided into three classes: 1. Phase-Splitting Devices. Two or m ...Chapter 35: Balanced Symmetrical Polyphase Systems - 20 hit(s)
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... ms, each e.m.f. and its current can be considered separately as constituting a single-phase system, that is, the polyphase system can be resolved into n equal single-phase systems, each of which consists of one conductor of the polyphase system, with zero impedance as return circuit. Hereby the investigation of the polyphase system resolves itself into that of its constituent single-phase system. So, for instance, the polyphase system shown in Fig. 208, at balanced load, can be considered as consisting of the equal ...Theory Section 17: Impedance and Admittance - 19 hit(s)
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17. IMPEDANCE AND ADMITTANCE 82. In direct-current circuits the most important law is Ohm's law, e -i or e r ir, or r = -.> where e is the e.m.f. impressed upon resistance r to produce current i therein. Since ...