Lecture 5: Long Distance Transmission
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Source Metadata
Section titled “Source Metadata”| Field | Value |
|---|---|
| Source | General Lectures on Electrical Engineering |
| Year | 1908 |
| Section ID | general-lectures-electrical-engineering-lecture-05 |
| Location | lines 2562-3132 |
| Status | candidate |
| Word Count | 2599 |
| Equation Candidates In Section | 35 |
| Figure Candidates In Section | 1 |
| Quote Candidates In Section | 0 |
Opening Source Excerpt
Section titled “Opening Source Excerpt”FIFTH LECTURE V l>nte LONG DISTANCE TRANSMISSION mHREE-PHASE is used altogether for long distance transmission. Two-phase is not used any more, and direct current is being proposed, having been used abroad in a few cases : but due to the difficulty of generation and utilization, it is not probable that it will find any extended use, so that it does not need to be considered. FREQUENCY The frequency depends to a great extent on the character of the load, that is, whether the power is used for alternating current distribution — 60 cycles^-or for conversion to direct current — 25 cycles. For the transmission line, 25 cycles has the advantage that the charging current is less and the inductive drop is less, because charging current and inductance voltage are proportional to the frequency. VOLTAGE 11,000Source-Located Theme Snippets
Section titled “Source-Located Theme Snippets”Dielectricity / capacity
Section titled “Dielectricity / capacity”... ns. At very high voltages it is therefore necessary to have the system statically balanced or symmetrical, that is, have the same potential differences from all the conductors to the ground. Any electric circuit, and so also the transmission line, contains inductance and capacity, and therefore stores energy as electromagnetic energy in the magnetic field due to the cur- rent, and as electrostatic energy, or electrostatic charge, due to the voltage. LONG DISTANCE TRANSMISSION 69 If: e = voltage, C = capacity. i = current, L = inductance. the ...Impedance / reactance
Section titled “Impedance / reactance”... C. Of frequencies entirely independent of the generator, or of a frequency which originates in the circuit, that is, high frequency oscillations as arcing grounds, etc. If a capacity is in series with an inductance, as the line capacity and the line inductance, the capacity reactance and the inductive reactance are opposed to each other ; if they hap- pened to be equal they would neutralize each other, the current would depend on the resistance only and therefore be very large, and with this very large current passing through the inductance and capacity ...Radiation / light
Section titled “Radiation / light”... ission. Two-phase is not used any more, and direct current is being proposed, having been used abroad in a few cases : but due to the difficulty of generation and utilization, it is not probable that it will find any extended use, so that it does not need to be considered. FREQUENCY The frequency depends to a great extent on the character of the load, that is, whether the power is used for alternating current distribution — 60 cycles^-or for conversion to direct current — 25 cycles. For the transmission line, 25 cycles has the advantage that the charg ...Waves / transmission lines
Section titled “Waves / transmission lines”... d use, so that it does not need to be considered. FREQUENCY The frequency depends to a great extent on the character of the load, that is, whether the power is used for alternating current distribution — 60 cycles^-or for conversion to direct current — 25 cycles. For the transmission line, 25 cycles has the advantage that the charging current is less and the inductive drop is less, because charging current and inductance voltage are proportional to the frequency. VOLTAGE 11,000 to 13,200 volts and more recently, even 22,000 volts is most common for shorte ...Chapter-Local Concept Hits
Section titled “Chapter-Local Concept Hits”| Concept Candidate | Hits In Section | Status |
|---|---|---|
| Frequency | 11 | seeded |
| Ether | 5 | seeded |
Chapter-Local Glossary Hits
Section titled “Chapter-Local Glossary Hits”| Term Candidate | Hits In Section | Status |
|---|---|---|
| ether | 5 | seeded |
Equation Candidates
Section titled “Equation Candidates”| Candidate ID | OCR / PDF-Text Candidate | Source Location |
|---|---|---|
general-lectures-electrical-engineering-eq-candidate-0034 | volts is most common for shorter distances, as 10 to 20 miles, | line 2590 |
general-lectures-electrical-engineering-eq-candidate-0035 | up to distances of 50 to 60 miles. | line 2608 |
general-lectures-electrical-engineering-eq-candidate-0036 | at — 7| = 57% of full voltage. | line 2629 |
general-lectures-electrical-engineering-eq-candidate-0037 | LONG DISTANCE TRANSMISSION 65 | line 2644 |
general-lectures-electrical-engineering-eq-candidate-0038 | and costs 10% less; but copper has a permanent value, while | line 2681 |
general-lectures-electrical-engineering-eq-candidate-0039 | 2 d = distance between conductor centres. | line 2731 |
general-lectures-electrical-engineering-eq-candidate-0040 | LONG DISTANCE TRANSMISSION 67 | line 2750 |
general-lectures-electrical-engineering-eq-candidate-0041 | ^ = 100,000 | line 2774 |
Figure Candidates
Section titled “Figure Candidates”| Candidate ID | OCR / PDF-Text Candidate | Source Location |
|---|---|---|
general-lectures-electrical-engineering-fig-018 | c/ Fig. 18. In Fig. i8 let | line 2725 |
Hidden-Gem Quote Candidates
Section titled “Hidden-Gem Quote Candidates”| Candidate ID | Candidate Passage | Source Location |
|---|---|---|
| No chapter-local candidates yet | - | - |
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.
- Waves / transmission lines: Map Steinmetz’s wave and line language onto modern distributed constants, propagation velocity, standing waves, and reflections.
- Ether references: Verify exact wording before drawing conclusions. Ether language must be separated from later interpretive systems.
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.
- Waves / transmission lines: Standing/traveling wave passages may support richer field interpretations; the page keeps those readings separate from verified Steinmetz wording.
- Ether references: If Steinmetz mentions ether, quote only the verified source words first; any broader ether-field synthesis belongs in a labeled interpretive layer.
Promotion Checklist
Section titled “Promotion Checklist”- Open the full source text and the scan or raw PDF.
- Verify the chapter boundary and surrounding context.
- Promote exact quotations only after checking the source image.
- Move mathematical candidates into canonical equation pages only after formula typography is corrected.
- Move diagram candidates into the diagram archive only after image extraction, crop verification, and manifest creation.
- Keep Steinmetz wording, modern translation, and ether-field interpretation in separate labeled layers.