A 120VAC_RMS, 60Hz line is connected to an SCR with a firing angle of 19 degrees....
A 120VAC_RMS, 60Hz line is connected to an SCR with a firing angle of 19 degrees. What is the RMS voltage at the SCR output? Can you accurately plot the SCR-output-line voltage? ans:1
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A 120VAC_RMS, 60Hz line is connected to an SCR with a firing angle of
19 degrees....
Questions 1 to 3 relate to a three-phase SCR rectifier supplied from a 415 Vrms, 50 Hz ac source. For a 100 Ω resistive load, determine the peak, minimum and average load current for SCR firing angle...
Questions 1 to 3 relate to a three-phase SCR rectifier supplied from a 415 Vrms, 50 Hz ac source. For a 100 Ω resistive load, determine the peak, minimum and average load current for SCR firing angles of: (a) a-0° (5.87 A, 5.08 A, 5.6 A) (b) α = 45° (5.67 A, 1.52 A, 3.96 A) (c) α-70° (4.5 A, 0 A, 2.0 A) How will your answers change if a very large inductance (zero resistance) is added in series...
A Single-phase halfwave controlled rectifier is used for a heating system whose rated power is 15kW at 220V. The SCR is connected to a 220 VAC system. 1. Determine the rated equivalent resistance of the heater 2. Determine the maximum that the rectifie
A Single-phase halfwave controlled rectifier is used for a heating system whose rated power is 15kW at 220V. The SCR is connected to a 220 VAC system. 1. Determine the rated equivalent resistance of the heater2. Determine the maximum that the rectifier can provide to the heater3. When the SCR is fired at angle of p/3, determinea. Waveform of the voltages across the load, the SCRb. Waveform of the currents flow through the SCR, drawn by the load and supplied...
If the load reactance is now changed to a very large series inductance, calculate the firing angle required to achieve a DC output load current of 20A. with rload =10ohm and 1.76ohm reactance connect...
If the load reactance is now changed to a very large series
inductance, calculate the
firing angle required to achieve a DC output load current of
20A.
with rload =10ohm and 1.76ohm reactance connected to it
Question 2 (20 Marks): A 3-phase SCR bridge feeds a load comprising a 10Ω resistor and 1.7662 reactance connected in series, from a 3-phase 415V, 50Hz AC supply. a) For a firing angle of a (i.e. diode operation), calculate the average DC output (6...
Assuming that the voltage across the 10kW load has an angle of O degrees and the...
Assuming that the voltage across the 10kW load has an angle of O degrees and the network has a frequency of 60Hz, please determine the following: 4. a) b) Phasor for the current in the 10kW load c) d) Phasor for the current flowing into the primary of the transformer Phasor for the current flowing in the line impedance (i.e. the 0.1? resistor and 531?? inductor). Phasor for the voltage vs Provide RMS values for all magnitudes. ?kw lo kw...
1. A full-bridge three-phase SCR rectifier supplies an L-R load from a 208 V line-to-line 60...
1. A full-bridge three-phase SCR rectifier supplies an L-R load from a 208 V line-to-line 60 Hz source. The load draws 25 kW when the SCR phase delay angle is 60°. What is the pulse number for this rectifier circuit? Plot the load power as a function of delay angle for 0° < α 75°
1) A projectile is fired into the air with a firing angle of 45 degrees. It...
1) A projectile is fired into the air with a firing angle of 45 degrees. It is observed that it has a range of 125 m. At what initial velocity did it fire? a) 45 m / s b) 35 m / s c) 1227 m / s d) 40 m / s
A foreign excitation motor is powered by a downcomer recuperative with a firing angle of 30 degrees, which is powered by...
A foreign excitation motor is powered by a downcomer recuperative with a firing angle of 30 degrees, which is powered by a 400V and 50Hz network and by a voltage downshift cutter. The drum resistance is 0.4Ω, the resistor 120Ω and the motor voltage constant 1.827V/A-rad/sec. Average drum current is 200A and excitation voltage 300V. The drum current is uninterrupted and without ripple. If the limiters (clippers) operating cycle is 65% calculate: 1) the power absorbed by the source 2)...
WW 1502 100uF 60mH 0000 V =170sin 3777 f =60Hz A 60mH inductor is connected in...
WW 1502 100uF 60mH 0000 V =170sin 3777 f =60Hz A 60mH inductor is connected in series with a 15 resistor, a 100 uF capacitor, and a sinusoidal voltage source, v(t) = 170sin(377t). What is the rms current? O 0.60 A 3.94 A o 7.76 A 8.01 A O 11.0 A
I. A balanced three-phase positive sequence wye-connected 60Hz source voltage has line-neutral voltage of V, 1000 V. It is connected to a three- phase wye connected load whose impedance is z 50+j...
I. A balanced three-phase positive sequence wye-connected 60Hz source voltage has line-neutral voltage of V, 1000 V. It is connected to a three- phase wye connected load whose impedance is z 50+j37.7 2 a. Find line currents ia ib, ic and line-line voltages Vab, Vbo Vac b. Find the total complex power delivered to the load. c. Find delta-connected capacitor bank needed to bring the PF to 0.95 (lagging) of system. d. Re-calculate currents la, ib, io with Case c....
I. A balanced three-phase positive sequence wye-connected 60Hz source voltage has line-neutral voltage of V, 1000 V. It is connected to a three- phase wye connected load whose impedance is z 50+j...
I. A balanced three-phase positive sequence wye-connected 60Hz source voltage has line-neutral voltage of V, 1000 V. It is connected to a three- phase wye connected load whose impedance is z 50+j37.7 2 a. Find line currents ia ib, ic and line-line voltages Vab, Vbo Vac b. Find the total complex power delivered to the load. c. Find delta-connected capacitor bank needed to bring the PF to 0.95 (lagging) of system. d. Re-calculate currents la, ib, io with Case c....
Questions 1 to 3 relate to a three-phase SCR rectifier supplied from a 415 Vrms, 50 Hz ac source. For a 100 Ω resistive load, determine the peak, minimum and average load current for SCR firing angles of: (a) a-0° (5.87 A, 5.08 A, 5.6 A) (b) α = 45° (5.67 A, 1.52 A, 3.96 A) (c) α-70° (4.5 A, 0 A, 2.0 A) How will your answers change if a very large inductance (zero resistance) is added in series...
If the load reactance is now changed to a very large series
inductance, calculate the
firing angle required to achieve a DC output load current of
20A.
with rload =10ohm and 1.76ohm reactance connected to it
Question 2 (20 Marks): A 3-phase SCR bridge feeds a load comprising a 10Ω resistor and 1.7662 reactance connected in series, from a 3-phase 415V, 50Hz AC supply. a) For a firing angle of a (i.e. diode operation), calculate the average DC output (6...
Assuming that the voltage across the 10kW load has an angle of O degrees and the network has a frequency of 60Hz, please determine the following: 4. a) b) Phasor for the current in the 10kW load c) d) Phasor for the current flowing into the primary of the transformer Phasor for the current flowing in the line impedance (i.e. the 0.1? resistor and 531?? inductor). Phasor for the voltage vs Provide RMS values for all magnitudes. ?kw lo kw...
1. A full-bridge three-phase SCR rectifier supplies an L-R load from a 208 V line-to-line 60 Hz source. The load draws 25 kW when the SCR phase delay angle is 60°. What is the pulse number for this rectifier circuit? Plot the load power as a function of delay angle for 0° < α 75°
WW 1502 100uF 60mH 0000 V =170sin 3777 f =60Hz A 60mH inductor is connected in series with a 15 resistor, a 100 uF capacitor, and a sinusoidal voltage source, v(t) = 170sin(377t). What is the rms current? O 0.60 A 3.94 A o 7.76 A 8.01 A O 11.0 A
I. A balanced three-phase positive sequence wye-connected 60Hz source voltage has line-neutral voltage of V, 1000 V. It is connected to a three- phase wye connected load whose impedance is z 50+j37.7 2 a. Find line currents ia ib, ic and line-line voltages Vab, Vbo Vac b. Find the total complex power delivered to the load. c. Find delta-connected capacitor bank needed to bring the PF to 0.95 (lagging) of system. d. Re-calculate currents la, ib, io with Case c....
I. A balanced three-phase positive sequence wye-connected 60Hz source voltage has line-neutral voltage of V, 1000 V. It is connected to a three- phase wye connected load whose impedance is z 50+j37.7 2 a. Find line currents ia ib, ic and line-line voltages Vab, Vbo Vac b. Find the total complex power delivered to the load. c. Find delta-connected capacitor bank needed to bring the PF to 0.95 (lagging) of system. d. Re-calculate currents la, ib, io with Case c....
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