Electric Motor Control
10th Edition
ISBN: 9781305177611
Author: Herman
Publisher: Cengage
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Chapter 40, Problem 2SQ
To determine
Explain the purpose of interlock (M) in the DC control circuit.
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A 60 Hz, 230 kV, 275 km long, uncompensated three-phase transmission line consists of three
conductors bundled by phase, such that each conductor in the line is of the ACSR Falcon type.
The
separation between each bundled conductor is d = 45 cm and the separation between each
phase of the line is 2.4 m.
Calculate:
"The parameters R, L, C of the line in Q2/km; µH/m and nF/m. And the total values of ZL and YC
in Q and S, respectively, and in polar coordinates."
Generalized constants A, B, C and D of the line, according to the type of transmission line.
Present the results in rectangular coordinates.
If a three-phase wye load draws 3/4 of the nominal current of the 300 MW system with FP =
0.85 lagging and at 230 kV, calculate:
(a) Current at the load in KA
(b) Voltage at the source in KV,
(c) Current at the source in kA and
(d) power at the source in MVA.
Obtain the results per phase.
Transmission line voltage regulation percentage
Determine the required EMT size for the following combination of conductors:18. Four 8 AWG Type THW and four 12 AWG Type THW:19. Three 350 kcmil and one 250 kcmil Type XHHW conductors and a 4 AWG bare conductor:20. In a nonmetallic-sheathed (Type NM) cable installation, a 10⁄3 with equipmentgrounding conductor is installed in a metal octagonal box to supply two 12⁄2 withequipment grounding conductor branch-circuit cables. What is the minimum sizebox? The box contains internal cable clamps
Chapter 40 Solutions
Electric Motor Control
Ch. 40 - What are the two basic functions of synchronous...Ch. 40 - Prob. 2SQCh. 40 - If all of the control circuits are ACand DC is not...Ch. 40 - When the rotor and stator fields lock into step,...Ch. 40 - Prob. 5SQCh. 40 - Prob. 6SQCh. 40 - In Figure 402, approximately what is the...Ch. 40 - Why are the AC ammeter and DC meter necessary in...Ch. 40 - Prob. 9SQ
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- For problems 8 and 9, determine the correct box size for each of the following conditions:8. Two nonmetallic sheathed cables with two 12 AWG conductors, an equipment groundingconductor, and a switch in a metal box without a plaster ring.9. A raceway run serving a series of luminaires, connected to a total of three circuits. Theluminaires are supplied by 120 volts from a 3-phase, 4-wire system. Each box will containtwo circuits running through the box and a third circuit connected to a luminaire, which issupported by a luminaire stud in the box. Use 12 AWG Type THHN conductors.arrow_forward28. The minimum size raceway for the following conductors is: a. Three, 250 kcmil conductors with XHHW insulation b. One, 3⁄0 AWG conductor with XHHW insulation c. One, 4 AWG conductor with XHHW insulation29. The minimum size raceway for the following conductors is: a. Twelve, 6 AWG conductors with THHN insulation b. Nine, 8 AWG conductors with THHN insulation c. Eighteen, 10 AWG conductor with THHN insulation d. One, 10 AWG equipment grounding conductor with THHN insulation30. The minimum size wireway for the following with parallel conductors is: a. Two sets of three, 250 kcmil conductors with XHHW insulation b. Two, 3⁄0 AWG conductors with XHHW insulation c. 1, 4 AWG conductor with XHHW insulation d. The conductors terminate on three power distribution blocks. Each one has adimension of 4 in. wide and 3 in. high:arrow_forwardbox fill calculationsarrow_forward
- Two trade size 3 raceways enter a pull box directly across from each other. No other raceways enter the box. What are the minimum dimensions of the box?11. Length ______________________12. Width ______________________13. Depth ______________________Two trade size 3 raceways enter a pull box at right angles to each other. No other racewaysenter the box. What are the minimum dimensions of the box?14. Length ______________________15. Width ______________________16. Depth ______________________arrow_forwardnot use ai pleasearrow_forwardFor Questions 21, 22, and 23, two 3-in. raceways enter a pull box, one through a side and theother in the back. Four 500 kcmil, type THHN conductors will be installed in the raceway.No other raceways enter the box. What are the minimum dimensions of the pull box 21. Length ________________22. Width ________________23. Depth ________________arrow_forward
- For Questions 24, 25, 26, and 27, determine the answers using the information shown in the drawing. Trade size 2 conduit Trade size 2 conduit Trade size 3 conduit Trade size 3 conduit Trade size 2 conduit Trade size 2 conduit 24. Dimension a must be at least. 25. Dimension b must be at least the same conductors). inches. inches (the raceways contain inches. 26. Dimension c must be at least 27. Do you foresee any difficulties in installing the conductors in these raceways? Explain.arrow_forwardFor problems 1-4, select from the following list of raceway types. Check the letter(s) representing the correct response(s): a. electrical metallic tubing b. electrical nonmetallic tubing c. flexible metallic tubing d. rigid metal conduit e. intermediate metal conduit f. rigid nonmetallic conduit 1. Which raceway(s) may be used where cinder fill is present? ☐ a. ☐ b. ☐ c. ☐ d. ☐ e. 2. Which raceway(s) may be used in hazardous locations? ☐ a. b. ☐ c. ☐ d. 3. Which raceway(s) may be used in wet locations? ☐ a. ☐ b. ☐ c. ☐ d. ☐e. ☐ ☐ e. ☐ f. ☐ d. ☐ e. ☐ f. 4. Which raceway(s) may be used for service entrances? ☐ c. ☐ a. O b.arrow_forwardHANDWRITTEN SOLUTION NOT USING CHATGPT PLEASEarrow_forward
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