Apparatus Section 5: Alternating-current Transformer: Short-circuit Current
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Source Metadata
Section titled “Source Metadata”| Field | Value |
|---|---|
| Source | Theoretical Elements of Electrical Engineering |
| Year | 1915 |
| Section ID | theoretical-elements-electrical-engineering-section-102 |
| Location | lines 18398-18460 |
| Status | candidate |
| Word Count | 370 |
| Equation Candidates In Section | 0 |
| Figure Candidates In Section | 0 |
| Quote Candidates In Section | 0 |
Opening Source Excerpt
Section titled “Opening Source Excerpt”V. Short-circuit Current 120. If a short circuit occurs at the secondary terminals of a transformer, and the power supply at the primary is sufficient to maintain the primary terminal voltage, the primary and second- ary currents of the transformer are limited by its impedance only. Thus, if r = P + j* is the impedance voltage, as fraction of full-load voltage, the short- circuit current of the transformer is 1 1 of the full-load current, thus usually is very large. In the three instances illustrated in Figs. 157, 159 and 160, with f = 0.02 + 0.02 j, hence f =0.028 0.01 + 0.04 j 0.04 0.01 + 0.08 j 0.08 the short-circuit current thus is 36, 25 and 12.5 times full-load current, respectively. As seen, with the exception of very low reactance transformers,Source-Located Theme Snippets
Section titled “Source-Located Theme Snippets”Impedance / reactance
Section titled “Impedance / reactance”... . If a short circuit occurs at the secondary terminals of a transformer, and the power supply at the primary is sufficient to maintain the primary terminal voltage, the primary and second- ary currents of the transformer are limited by its impedance only. Thus, if r = P + j* is the impedance voltage, as fraction of full-load voltage, the short- circuit current of the transformer is 1 1 of the full-load current, thus usually is very large. In the three instances illustrated in F ...Complex quantities
Section titled “Complex quantities”... secondary terminals of a transformer, and the power supply at the primary is sufficient to maintain the primary terminal voltage, the primary and second- ary currents of the transformer are limited by its impedance only. Thus, if r = P + j* is the impedance voltage, as fraction of full-load voltage, the short- circuit current of the transformer is 1 1 of the full-load current, thus usually is very large. In the three instances illustrated in Figs. 157, 159 and 160, with f ...Radiation / light
Section titled “Radiation / light”... becoming increasingly important. This means a construction providing for considerable internal reactance. As the regulation of large power transformers is of no serious impor- tance, the desirability of low reactance, which exists in the small lighting and general distribution transformers, does not exist in large power transformers, and modern practice tends toward the use of internal reactance of 4 to 8 per cent., to secure reasonable mechanical safety.Chapter-Local Concept Hits
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Section titled “Modern Engineering Reading Prompts”- Impedance / reactance: Translate historical opposition terms into modern impedance, admittance, conductance, susceptance, and complex-plane notation.
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Section titled “Ether-Field Interpretive Boundary”- Radiation / light: Radiation and wave language can invite ether-field comparison, but source wording, modern radiation theory, and speculative synthesis must stay separated.
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