Electrical Transformers and Rotating Machines
4th Edition
ISBN: 9781305494817
Author: Stephen L. Herman
Publisher: Cengage Learning
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Question
Chapter 21, Problem 10RQ
To determine
The size of conductor for the branch circuit supply.
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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.
Question 4
A 228 V/ 111 V single-phase transformer has a core loss of 110 W and the no-load current is 0.7 A. The no load power factor is
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Question 5
A 2 kV / 229 V transformer has the secondary turns of 47. The number of Primary turns of a transformer is given by,
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Question 6
For the given power transfer, a delta system is associated with larger line currents and a star system is associated with a larger line voltage.
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Two shunt generators 1 and 2 are operating in parallel. The voltage of generator 1 falls from 240 V at no-load to 220 V at 200 A, while that of generator 2 falls from 245 V at no-load to 220 at 150 A. Determine the current which each generator supplies to n common load of 300 A and the bus-bar voltage at this load. The load characteristics of the generators may be taken as straight lines.
Chapter 21 Solutions
Electrical Transformers and Rotating Machines
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- Two transformers rated at 100 kVA each are connected in an open-delta connection. What is the total output power that can be supplied by this bank?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_forwardA 10 kVA transformer has a primary voltage rating of 240 volts and a secondary voltage rating of 480 volts. The transformer is connected to a circuit protected by a 100 ampere circuit breaker. The secondary is protected by a 25-ampere fuse. Does the primary require separate overcurrent protection?arrow_forward
- How does the National Electrical Code specify that the high leg of a four-wire delta connection be marked?arrow_forwardIf dual-element time delay fuses are to be used as the short circuit protective device, what size fuses should be used to protect the circuit in question #12? Five 5 HP, three-phase motors with NEMA code B are connected to a 240-volt line. The conductors are copper with type THWN insulation. What size conductor should be used to supply all of these motors?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_forward
- An 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_forwardName three factors that determine the amount of induced voltage.arrow_forwardIf 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_forward
- What size conductor should be used to connect the primary of the transformer described in question #6? Assume the conductor to be copper with type THW insulation.arrow_forwardwhat is the smallest gage size copper wire that will limit the conductor voltage drop to 5v when 120 vac is supplied to a 6-A loadarrow_forwardWhat is the peak voltage of a 120V RMS AC voltage?arrow_forward
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