Technological know-how basics guide used to be built to aid nuclear facility working contractors supply operators, upkeep group of workers, and the technical employees with the mandatory basics education to make sure a uncomplicated knowing of electric conception, terminology, and alertness- The instruction manual comprises details on alternating present (AC) and direct present (DC) idea, circuits, vehicles, and turbines; AC strength and reactive parts; batteries; AC and DC voltage regulators; transformers; and electric try tools and measuring units. this knowledge will supply group of workers with a beginning for figuring out the fundamental operation of assorted forms of DOE nuclear facility electric gear.
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Extra info for U.S. Department of Energy. Fundamentals Handbook. Electrical Science
Turns ratio c. Impedance ratio d. 2 DESCRIBE the differences between a wye-connected and delta-connected transformer. 3 Given the type of connection and turns ratios for the primary and secondary of a transformer, CALCULATE voltage, current, and power for each of the following types: a. ∆-∆ b. ∆-Y c. Y-∆ d. 4 STATE the applications of each of the following types of transformers: a. Distribution b. Power c. Control d. Auto e. Isolation f. Instrument potential g. Instrument current Rev. 0 Page v ES-13 Transformers Intentionally Left Blank ES-13 Page vi Rev.
The transformer windings may be connected to form a 3φ bank in any of four different ways (Figure 5). Figure 5 3φ Transformer Connections Figure 5 shows the voltages and currents in terms of applied line voltage (V) and line current (I), where the turns ratio (a) is equal to one. Voltage and current ratings of the individual transformers depend on the connections (Figure 5) and are indicated by Table 1 for convenience of calculations. Rev. 0 Page 9 ES-13 TRANSFORMER THEORY Transformers TABLE 1: Voltage and Current Ratings of Transformers Primary Transformer Connection (Primary to Secondary) Volt.
Delta Connection . . . . . . . . . . . . . . . Wye Connection . . . . . . . . . . . . . . . Combinations of Delta and Wye Transformer Connections Transformer Losses and Efficiency . . . . . . . . Transformer Operation Under No-Load . . . . . . . Coil Polarity . . . . . . . . . . . . . . . . Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .