Electrical Transformers and Rotating Machines
4th Edition
ISBN: 9781305494817
Author: Stephen L. Herman
Publisher: Cengage Learning
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Question
Chapter 8, Problem 9RQ
To determine
The secondary line current.
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Chapter 8 Solutions
Electrical Transformers and Rotating Machines
Ch. 8 - How many transformers are needed to make an...Ch. 8 - Two transformers rated at 100 kVA each are...Ch. 8 - Prob. 3RQCh. 8 - Assume that a line voltage of 2400 volts is...Ch. 8 - Prob. 5RQCh. 8 - How much current is flowing through the secondary...Ch. 8 - How much current is flowing through the primary...Ch. 8 - Prob. 8RQCh. 8 - Prob. 9RQCh. 8 - How much current is flowing in the secondary...
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- A load impedance of 52 Ω is connected to the secondary winding of the transformer in question 3. How much current will flow in the secondary?arrow_forwardAn alternator with a line voltage of 2400 V supplies a delta-connected load. The line current supplied to the load is 40 A. Assuming the load is a balanced three-phase load, what is the impedance of each phase?arrow_forwardA 480-volt three-phase load is rated at 34.5 kVA. It is to be supplied with variable three-phase voltage. Because the load is continuous, the transformers ratings are to be increased by 1.25% of the rated load. Three variable autotransformers are used to supply this load. Refer to Table 4-2 and determine the standard size of each transformer that should be used to make this connection.arrow_forward
- If the secondary of the transformer in question 5 supplies a current of 9.6 amperes to a load, what is the primary current? (Disregard excitation current.)arrow_forwardRefer to the transformer shown in Figure 5-13 to answer the following questions. What is the turns ratio of the winding between points B and E as compared to the winding between points D and E? Figure 5-13 Autotransformer practice problems.arrow_forwardIf a single-phase load is connected across the two line conductors and neutral of the transformer in question #2, and one line has a current of 80 amps and the other line has a current of 68 amps, how much current is flowing in the neutral conductor?arrow_forward
- 1. Two compound generators are operated in parallel. If generator A has a series-field resistance of 0.0015 ohm and is adjusted to take 20 percent of the line load while generator B with a series field resistance of 0.001 ohm takes the remainder of the load. Determine the current flow in the two series fields and the equalizer when the load is 250 kw at 230 volts.arrow_forwardWhat is the total current from the voltage source in Figure 6-64 for each switch position? Figure 6-64 15 V + +₁₁ +₁ R₁ 1.0 ΚΩ +₁ R₂ 1.8 ΚΩ www +₁₁ R3 2.2 ΚΩ www R4 2.7 ΚΩarrow_forwardDon't Use Chat GPT Will Upvotearrow_forward
- A 10kW, 120V-DC series generator has an armature resistance of 0.1 ohms and a series field resistance of 0.05 ohms. Assuming that it is delivering rated current at rated speed, find the a) armature current and b) induced emf. (Write only the value without the unit) la = Blank 1 A Ea = Blank 2 V (Round-off to 2 decimal places)arrow_forwardA shunt generator supplies a 26kW load at 235V through cables of resistance, R = 112mQ. If the field winding resistance, Rf =560 and the armature resistance, Ra =47MQ. Determine the following below: The terminal voltage is, The e.m.f. generated in the armature is,arrow_forwardA 3-phase, 50 Hz, 3000 V motor develops 600 H.P. (447·6 kW), the power factor being 0·75 lagging andthe efficiency 0·93. A bank of capacitors is connected in delta across the supply terminals and powerfactor raised to 0·95 lagging. Each of the capacitance units is built of five similar 600-V capacitors.Determine the capacitance of each capacitor.arrow_forward
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