Chapter 16: Load Balance Of Polyphase Systems
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Source Metadata
Section titled “Source Metadata”| Field | Value |
|---|---|
| Source | Theory and Calculation of Electric Circuits |
| Year | 1917 |
| Section ID | theory-calculation-electric-circuits-chapter-16 |
| Location | lines 29302-30428 |
| Status | candidate |
| Word Count | 2820 |
| Equation Candidates In Section | 0 |
| Figure Candidates In Section | 0 |
| Quote Candidates In Section | 0 |
Opening Source Excerpt
Section titled “Opening Source Excerpt”CHAPTER XVI LOAD BALANCE OF POLYPHASE SYSTEMS 163. The total flow of power of a balanced symmetrical poly- phase system is constant. That is, the sum of the instantaneous values of power of all the phases is constant throughout the cycle. In the single-phase system, however, or in a polyphase system with unbalanced load, that is, a system in which the different phases are unequally loaded, the total flow of power is pulsating, with double frequency. To balance an unbalanced polyphase system thus requires a storage of energy, hence can not be done by any method of connection or transformation. Thus mechanical momentum acts as energy-storing device in the use as phase bal- ancer, of the induction or the synchronous machine. Electrically, energy is stored by inductance and by capacity. The question then arises, whetherSource-Located Theme Snippets
Section titled “Source-Located Theme Snippets”Dielectricity / capacity
Section titled “Dielectricity / capacity”... s a storage of energy, hence can not be done by any method of connection or transformation. Thus mechanical momentum acts as energy-storing device in the use as phase bal- ancer, of the induction or the synchronous machine. Electrically, energy is stored by inductance and by capacity. The question then arises, whether by the use of a reactor, or a condenser, con- nected to a suitable phase of the system, an unequally loaded polyphase system can be balanced, so as to give constant power during the cycle. In interlinked polyphase circuits, such as the th ...Impedance / reactance
Section titled “Impedance / reactance”... Q cos (2 - a) + Q' cos (2 « - 2/3 - I) = (26) LOAD BALANCE OF POLYPHASE SYSTEMS 319 hence, & = Q (27) 2 - 2 18 - I = 2 - a - IT or, thus. /3 = f + I (28) 2 ^ ?' = ^ (29) e' = E' cos [0 - (I + I) ] (31) is the voltage, which, impressed upon a reactor of reactance, x = §Q (30) balances the power, P = P + cos .(2 - a) (24) of an unbalanced polyphase system. That is, e' = E' cos [* - (f + J) ] (31) impressed upon the reactance, x, gives the current, '■-^-[*-(i+T)] »^' and thus the power, p'-«eo.[*-(| + |)]cos[*-(J + %')] ...Radiation / light
Section titled “Radiation / light”... us values of power of all the phases is constant throughout the cycle. In the single-phase system, however, or in a polyphase system with unbalanced load, that is, a system in which the different phases are unequally loaded, the total flow of power is pulsating, with double frequency. To balance an unbalanced polyphase system thus requires a storage of energy, hence can not be done by any method of connection or transformation. Thus mechanical momentum acts as energy-storing device in the use as phase bal- ancer, of the induction or the synchronous machi ...Field language
Section titled “Field language”... n f (cos a + 1) and F(cos a — 1), where cos a is the power-factor of the single-phase load. Especially in alternators of very high armature reaction, as modern steam-turbine alternators, a pulsation of the armatiu^ reaction is very objectionable. It causes a pulsation of the field flux, leading to excessive eddy-current losses and consequent re- duction of the output. The use of a squirrel-cage winding in the 314 LOAD BALANCE OF POLYPHASE SYSTEMS 315 field pole faces of the single-phase alternator reduces the pulsation of the field flux, but als ...Chapter-Local Concept Hits
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Chapter-Local Glossary Hits
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| ether | 1 | seeded |
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Modern Engineering Reading Prompts
Section titled “Modern Engineering Reading Prompts”- Dielectricity / capacity: Check whether the passage treats capacity, condensers, displacement, or dielectric stress as field storage rather than only circuit algebra.
- Impedance / reactance: Translate historical opposition terms into modern impedance, admittance, conductance, susceptance, and complex-plane notation.
- Radiation / light: Compare the chapter’s radiation vocabulary with modern electromagnetic radiation, spectral frequency, wavelength, absorption, and illumination engineering.
- Field language: Read for whether field language is mechanical, geometrical, causal, descriptive, or simply a convenient engineering model.
- Magnetism: Track flux, reluctance, permeability, magnetizing force, and loss language against modern magnetic-circuit terminology.
Ether-Field Interpretive Boundary
Section titled “Ether-Field Interpretive Boundary”- Dielectricity / capacity: A Wheeler-style reading may emphasize dielectric compression, field stress, and stored potential, but this page treats that as interpretation unless Steinmetz explicitly says it.
- Radiation / light: Radiation and wave language can invite ether-field comparison, but source wording, modern radiation theory, and speculative synthesis must stay separated.
- Field language: Field-pressure or field-gradient interpretations can be explored here only after the explicit source passage and modern engineering translation are kept distinct.
- Magnetism: Centrifugal/divergent magnetic-field readings are interpretive overlays, not automatic historical claims.
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- Verify the chapter boundary and surrounding context.
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