Report Record 4: Record of Four Troubles
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Source Metadata
Section titled “Source Metadata”| Field | Value |
|---|---|
| Source | Investigation of Some Trouble in the Generating System of the Commonwealth Edison Co. |
| Year | 1919 |
| Section ID | commonwealth-edison-generating-system-trouble-section-03-record |
| Location | PDF pages 16-27, lines 1139-2164 |
| Status | pdf-text-extracted-candidate |
| Word Count | 4341 |
| Equation Candidates In Section | 0 |
| Figure Candidates In Section | 0 |
| Quote Candidates In Section | 0 |
Opening Source Excerpt
Section titled “Opening Source Excerpt”II RECORD Four troubles were studied, occurring respectively on September 18th, 1919, 3:47 P.M. September 18th, 1919, 5:27 P.M. October 22nd, 1919, 12:20 P.M. May 19th, 1919, 7:25 A.M. The generating system is divided into four sections, connected in tandem, with the A section of Fisk Street, and the Northwest Station as the two ends of the chain, and with power limiting reactors 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 noSource-Located Theme Snippets
Section titled “Source-Located Theme Snippets”Ether references
Section titled “Ether references”... ep with each other at practically zero voltage for a considerable time, about a quarter of an hour. Apparently, the synchronizing power between the station sections is lower than desirable, and the speed con- trol of the alternators not such as to bring them promptly so close together in speed as to drop into step. d) The tandem or chain connection of the stations has the disad- vantage that if an intermediary station, as Fisk B or Quarry Street, even momentarily drops out of synchronism by a short circuit, the system is cut in two. Ring connection of the sta ...Impedance / reactance
Section titled “Impedance / reactance”... connected in tandem, with the A section of Fisk Street, and the Northwest Station as the two ends of the chain, and with power limiting reactors 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 ...Radiation / light
Section titled “Radiation / light”... an amplitude apparently of 1,000 to 2,000 volts, most severe in Fisk A, where the trouble originated, of an irregular period of about 1 second per beat. d) The tie line reactor B, got very hot. e) The drop of voltage and the voltage fluctuation lasted for 18 minutes, with only slight decrease. Then they suddenly disappeared and normal voltage returned. f) During the disturbance, the frequency of the system fluctuated by about two cycles, that is 8%, and three machines in Fisk A where the trouble originated tripped their excess speed governors and cut off ste ...Transients / damping
Section titled “Transients / damping”... ference between the machine reverses, and the ma- chines thus oscillate against each other, while the interchange current between the machines fluctuates between a maximum value at maximum phase difference, and zero or a minimum value when machines are in phase. If there were no damping effects, this oscillation would con- tinue with constant amplitude. Due to the damping effects exerted mainly by the lag of the field flux behind the resultant field excitation (the armature reaction component of the synchronous impedance), the amplitude of the oscillation stead ...Chapter-Local Concept Hits
Section titled “Chapter-Local Concept Hits”| Concept Candidate | Hits In Section | Status |
|---|---|---|
| Synchronism | 26 | pdf-text-extracted-candidate |
| Synchronous machines | 21 | pdf-text-extracted-candidate |
| Short circuit | 14 | pdf-text-extracted-candidate |
| Synchronizing power | 6 | pdf-text-extracted-candidate |
| Power limiting reactor | 5 | pdf-text-extracted-candidate |
| Tie cable | 2 | pdf-text-extracted-candidate |
| Hunting pulsation | 1 | pdf-text-extracted-candidate |
Chapter-Local Glossary Hits
Section titled “Chapter-Local Glossary Hits”| Term Candidate | Hits In Section | Status |
|---|---|---|
| synchronizing power | 6 | pdf-text-extracted-candidate |
| power limiting reactor | 5 | pdf-text-extracted-candidate |
| tie cable | 2 | pdf-text-extracted-candidate |
| hunting pulsation | 1 | pdf-text-extracted-candidate |
| power limiting reactance | 1 | pdf-text-extracted-candidate |
Equation Candidates
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Figure Candidates
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Hidden-Gem Quote Candidates
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Modern Engineering Reading Prompts
Section titled “Modern Engineering Reading Prompts”- Ether references: Verify exact wording before drawing conclusions. Ether language must be separated from later interpretive systems.
- Impedance / reactance: Translate historical opposition terms into modern impedance, admittance, conductance, susceptance, and complex-plane notation.
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- Transients / damping: Separate the temporary term from the final steady-state term and compare with differential-equation response language.
- Dielectricity / capacity: Check whether the passage treats capacity, condensers, displacement, or dielectric stress as field storage rather than only circuit algebra.
Ether-Field Interpretive Boundary
Section titled “Ether-Field Interpretive Boundary”- Ether references: If Steinmetz mentions ether, quote only the verified source words first; any broader ether-field synthesis belongs in a labeled interpretive layer.
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- Transients / damping: Transient collapse, impulse, and surge behavior can be compared with alternative field language, but only as a clearly marked reading.
- 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.
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