Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 48, Problem 15SQ
To determine
Explain whether all the motors rotate in the same direction when it is connected to the appropriate phase sequences (L1, L2, and L3) to their appropriate terminals on the motor (T1, T2, and T3).
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Look at the photo and answer the following questions
it Is a 6 pole, non-salient pole design, 3 phase ac generator, 10 volts induced in each coil.
1. What is the total voltage induced in each of the three phase belts?
2. What is the line voltage between L1&L2?
3. What is the line voltage between L2&L3?
4. What is the line voltage between L1&L3?
15. Should the brushes of a loaded generator be placed in the neutral plane ?
(DC GENERATOR QUESTION)
Draw the power circuit and control circuit of a Direct On Line Motor Starter fo a three-phase motor. Add 4 pilot lights (PL) in the control circuit; red PL for running forward, orange PL for running in reverse, green for not running and yellow for overload.1. List the components used.
2. Procedures.
Chapter 48 Solutions
Electric Motor Control
Ch. 48 - In Figure 482, what is the purpose of normally...Ch. 48 - Can a time-delay relay be used satisfactorily in a...Ch. 48 - Prob. 3SQCh. 48 - Prob. 4SQCh. 48 - Prob. 5SQCh. 48 - What is the purpose of the lockout relay or safety...Ch. 48 - What happens if the reverse push button is closed...Ch. 48 - Prob. 8SQCh. 48 - Prob. 9SQCh. 48 - In Figure 487, is it necessary to push the stop...
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- Three squirrel-cage motors are connected to a 480-volt three-phase feeder. The nameplates list the following: Motor 1: HP 10, SF 1.25, Full-load amps 13.1, NEMA Code B Motor 2: HP 25, SF 1.10, Full-load amps 32.8, NEMA Code B Motor 3: HP 15, SF 1.00, Full-load amps 19.6, NEMA Code B The main feeder conductors and conductors to each motor are to be copper, with THWN insulation. The main feeder and each of the motors are protected by dual-element time delay fuses. Determine the conductor size for each motor and the conductor size for the feeder supplying all motors, the overload heater size of each motor using the chart in Figure 34-8, the NEMA and IEC starter sizes for each motor, the fuse size to protect the circuit for each motor, and the fuse size to protect the main feeder.arrow_forwardThere is a 70 km long transmission line whose series resistance and shunt capacity are neglected. The series reactance of the line is x=0.4 ohm/km. The voltage at the receiving end of the line is 154 000 volts. The voltage on the generator side is 162 500 volts. If 500 A current is drawn from the line, what are the values of the active and reactive powers on the generator side?arrow_forward1) 1.what are relationships between voltage level, line loss, transmitted power /distance, and cost of primary electrical equipment? 2.What is grounding system? How many items will be affected by the selection of grounding system? 3.list all the mode of grounding system 4.please draw a phase diagram of a non-ground AC system and tell what are main aspects in normal operation?? If U phase is metallically grounded, what are main aspects of operation? 5.please draw a phase diagram of a AC system grounded by a arc suppression coil? If U phase is metallically grounded, what are the additional currents occurring? 6.What are full-compensation, under-compensation, and over-compensation of arc suppression coil ground AC system, and why first two options are not applicable in system selection?? please solve allarrow_forward
- Determine the following based on the wiring diagram illustrated in figure 8 on worksheet 5 if it is that of a 6-pole, non-salient pole, 60-Hz, 3-phase AC generator stator that has 10 volts induced in each coil. What is the line voltage between L1 & L2? - A-30V, B-180V, C-312V, D- none of the above. What is the line voltage between L2 & L3? -A-30V, B-180V, C-312V, D- none of the above. What is the line voltage between L1 & L3?-A-30V, B-180V, C-312V, D- none of the abovearrow_forwardWhich of the following is the busbar type where active power and busbar voltage are input data in power flow and reactive power and phase angle are calculated?a) Current busbarb) Oscillation busbarc) Voltage controlled busbard) Frequency controlled busbare) Suck busf) Load busbararrow_forward36.A 1000-kVA, 11-kV three-phase wye-connected synchronous generator supplies a 600-kW, 0.8 leading of load. The synchronous reactance is 24 Ω per phase and the armature resistance is negligible. Calculate the voltage regulation.arrow_forward
- . A commercial Building, 60hz, Three Phase System, 230V with total highest Single PhaseAmpere Load of 1,088 Amperes, plus the three-phase load of 206Amperes including thehighest rated of a three-phase motor of 25HP, 230V, 3Phase, 68Amp Full Load Current.Determine the Following through showing your calculations. The Size of THHN Copper Conductor (must be conductors in parallel, either 2 to 5sets),TW Grounding Copper Conductor in EMT Conduit.b. The Instantaneous Trip Power Circuit Breaker Sizec. The Transformer Sized. Generator Sizearrow_forwardQuestion 3a) The Electricity Company of Ghana (ECG) has noticed two different values of voltagebetween the No-load Voltage and the load Voltage aa the end of one of their distribution feeders. One is 80% and the 4other is 2%. Which of these two values would you recommend to ECG to use and why? b) An Electrical Power Generation Company has engaged you as their consultant for you to advise them on their Synchronous generators. During a peaking load situation which occurred between 5pm to 8pm, the generators experienced transient stability challenges that lead even to some of the generators shutting down. You have been called upon to provide five (5) engineering answers that would cause the problems.arrow_forwardReferring to Figure 9.3, if the generator phase voltage is 400 volts and the load is balanced with each legat 10 Ω, determine the line voltage, line current, generator phase current, load current and the voltage across each load leg.arrow_forward
- 3- What will be the current in the primary windings?i) When secondaries are not loaded ?ii) When secondaries are loaded ?arrow_forwardConsider a three-phase 13.8 kV, 25-MVA, Y-connected synchronous generator whose three-phase short-circuit losses are 52.8 kW at rated armature current. Calculate its armature resistance per phase. a-0.16 Ohm b-0.016 Ohm -1.016 Ohm: d- 603.2 A e-0.7 Ohm.arrow_forwardH BRIDGE USING 2 RELAYS DIAGRAM AND IDENTIFY THE PARTS.arrow_forward
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