Please Log in or Register for more.

Explain the principle of ON-OFF control and phase control of AC voltage controller with suitable circuit and waveforms.

3.5k views

1 Answer

Answer :

 
✔️✔️Best answer

The integral cycle control (on-off control) and phase angle control are the two types of AC voltage controller.

The principle of ON-OFF control:

The on-off control is also called an integral cycle control. The on-off control is shown in the figure for single phase full wave AC voltage controller. To avoid the fluctuations at the output the turning on and off operation should be fast. The power semiconductor switches are used in integral cycle control. In integral cycle control, the switch is turned on for the certain number of complete cycle and the switch is turned off for the certain number of cycles. The integral cycle control is not very popular. Because it introduces sub-harmonics in line current. Integral cycle control is used for heating applications and speed control of AC motors.

image


Phase control of AC voltage controller:

Phase angle control is the type of AC voltage controller. The power flow can be control by firing angle control. In phase control, the switch is on for some period of each cycle.

image

 

Like 0 like

On off ac voltage controller with rl load

Please log in or register to answer this question.

Related Questions


The SCR would be turned OFF by voltage reversal of applied anode-cathode ac supply frequency of A) 10 kHz B) 10 Hz C) 5 kHz D) 5 Hz 

Show More

185 views 0 answers







Explain the pulse width modulation technique for control of AC output voltage.

Show More

101 views 0 answers







Explain three phase half wave controller or three phase unidirectional controller.
Last Answer : Three phase half wave controller or unidirectional controller:

Show More

239 views 1 answer







Explain Three Phase Bidirectional Delta Connected Controller.
Last Answer : Three Phase Bidirectional Delta Connected Controller:

Show More

483 views 1 answer







Explain three phase full wave controller.
Last Answer : Three phase full wave controller: Three phase full wave controller is also called as the three-phase bidirectional controller. Let the load is star connected so at each phase there are antiparallel connected SCRs. ... conduct at the same time and the third phase will be open.

Show More

266 views 1 answer













Draw the waveform of three phase AC supply voltage.

Show More

212 views 0 answers







Explain series switching control of AC load. Single phase resistance load - Integral half cycle control Phase control - Resistance load

Show More

65 views 0 answers








Last Answer : GTO can be turned on by providing positive pulse to the gate terminal and it can be turn off by providing negative pulse to gate terminal.

Show More

102 views 1 answer







Draw the structural diagram of GTO. Explain briefly the switching behavior of GTO with the help of appropriate voltage and current waveform.
Last Answer : Gate Turn Off Thyristor (GTO) Conventional Thyristor can be turned on with gate terminal but can not turn off from gate terminal. But in case of Gate Turn Off Thyristor (GTO), we can turn it on and off ... subdivided as storage period (Ts), fall period (Tp) and tail period (Tt).

Show More

1.7k views 1 answer







What is a phase control thyristor?

Show More

153 views 0 answers













Explain with neat circuit diagrams the procedures to perform no load and blocked rotor tests on three phase induction motor.

Show More

127 views 0 answers







Define pinch off voltage and drain resistance of FET.
Last Answer : 1 . Pinch-off Voltage: It is the value of the drain to source voltage VDS at which the drain current ID reaches its constant saturation value. Any further increase in VDS does not have any ... drain to source voltage to the change in drain current. It is also called AC/dynamic drain resistance.

Show More

120 views 1 answer







What is meant by pinch off voltage in MOSFET?

Show More

102 views 0 answers







Explain power in single phase AC circuit.

Show More

82 views 0 answers







The speed of a three-phase induction motor is controlled by variable voltage variable frequency control (i.e. keeping V/f constant). As the frequency is reduced, the slip at maximum torque  (1) Decreases (2) Increases (3) Remains constant (4) None of the above
Last Answer : The speed of a three-phase induction motor is controlled by variable voltage variable frequency control (i.e. keeping V/f constant). As the frequency is reduced, the slip at maximum torque Increases 

Show More

227 views 1 answer







speed control methods of three phase induction motor?
Last Answer : Speed control of three phase induction motor

Show More

363 views 2 answers







Write short notes on 3 phase AC system.

Show More

120 views 0 answers







An unshielded moving iron voltmeter is used to measure the voltage in an AC circuit. The stray DC magnetic field having a component along the axis will be  (1) unaffected (2) decreased (3) increased (4) either decreased or increased depending on the direction of the DC field
Last Answer : An unshielded moving iron voltmeter is used to measure the voltage in an AC circuit. The stray DC magnetic field having a component along the axis will be either decreased or increased depending on the direction of the DC field

Show More

334 views 1 answer







Temperature controller using SCR
Last Answer : Temperature controller using SCR The temperature control circuit is used to regulate the temperature. Figure shows the temperature control circuit using thermostat as temperature detector and SCR as ... half-cycle and heater gets connected to source to produce heat and raise the temperature.

Show More

412 views 1 answer








Last Answer : The armature voltage control of D.C. motor provides constant torque drive.

Show More

91 views 1 answer







What is the difference between a line voltage and low voltage control system?

Show More

117 views 0 answers







Explain how sinusoidal AC voltage is generated by using simple one loop generator.
Last Answer : An electric current produced by means of electrical machine is known as generator which converts mechanical energy into electrical energy. When conductor cuts the magnetic flux, emf induced in it. (Faraday' ... upon position of armature. The nature of emf is alternating as shown by the waveform. 

Show More

1.4k views 1 answer







Analyze the effect of supply voltage on performance of LED as regards current, Lumen output, efficacy and life. 
Last Answer : 1) Effect on Current:- In LED current depends upon supply voltage, if voltage get changes then current also change but this change in current will be control by resistors which are connected in series.  2) ...   4) Effect on Life:- If supply voltage is not stable then life of LED get reduced. 

Show More

106 views 1 answer







With the help of N-channel JFET describe the effect of input voltage VGS on output current ID.
Last Answer : Working of N channel FET: * When a voltage is applied between the drain and source with a DC supply (VDD), the electrons flows from source to drain through narrow channel ... where the channel gets completely blocked and the drain current becomes zero is called pinch- off voltage. 

Show More

224 views 1 answer







what is the minimum voltage required to turn on a diode ?
Last Answer : 0.7 v sil and 0.3 v for gr

Show More

156 views 1 answer







Draw single phase full wave mid-point converter for inductive load. Draw input and output waveforms for it. 
Last Answer : Circuit Diagram: Waveforms:

Show More

531 views 1 answer







For a balanced three phase star connected load for which line voltage is 230V and per phase resistance and reactance is 6 Ohm and 8 Ohm respectively. Calculate: 1) phase voltage 2) line current 3) power factor 4) total power absorbed

Show More

203 views 0 answers







Write the relation between phase and line current, phase and line voltage for Star connection.
Last Answer : Line voltage is equal to root three times of phase voltage and line and phase currents are equal in star connection

Show More

374 views 2 answers







What is line voltage and phase voltage? Draw balanced three phase star connected system. Show all the voltages and currents.

Show More

125 views 0 answers







A single core cable is designed to work for a single phase system with a peak voltage of 220 kV. The maximum permissible stress in the dielectric is not to exceed 20 kV/mm. For economical size, the overall core diameter of the cable is (A) 28.2 mm (B) 26.4 mm (C) 24.4 mm (D) 22.0 mm
Last Answer : A single core cable is designed to work for a single phase system with a peak voltage of 220 kV. The maximum permissible stress in the dielectric is not to exceed 20 kV/mm. For economical size, the overall core diameter of the cable is 22.0 mm

Show More

755 views 1 answer







In an alternator at lagging power factor the generated voltage per phase as compared to that at unity power factor?
Last Answer : In an alternator, at lagging power factor the generated voltage per phase as compared to that at unity power factor must be more than terminal voltage.

Show More

524 views 1 answer







What is the difference between line and phase voltage?
Last Answer : Line voltage  is  voltage  between two  phases R &Y  (415 v)  while  phase  voltage  is  the  voltage  between  one  phase and  a neutral  B &  N   (240 v).

Show More

207 views 1 answer







Why the read of 3 phase voltage is 440?
Last Answer : The  read  of  a  phase  voltage  should be approximatly  240v. This  is  because  line  voltage  equals  to quberoot of  phase  voltage.

Show More

96 views 1 answer







What is the voltage in 3 phase line?
Last Answer : between 430 to 440 v

Show More

283 views 4 answers







Total instantaneous power supplied by a 3-phase ac supply to a balanced R-L load is
Last Answer : Total instantaneous power supplied by a 3-phase ac supply to a balanced R-L load is constant

Show More

1.3k views 1 answer







Is the power line voltage available in our homes a dc or an ac voltage?
Last Answer : The power line voltage available in our homes is AC. Mobile dwellings are the most commonly DC-supplied homes and even then they tend to include AC supply for heavier loads.

Show More

5.2k views 1 answer







A Unified Power Flow Controller (FACTS controller) is a voltage source converter based (A) Inter-phase power controller (B) Static Compensator (C) Combination of series and shunt compensators (D) Solid-state series compensator
Last Answer : A Unified Power Flow Controller (FACTS controller) is a voltage source converter based Combination of series and shunt compensators

Show More

110 views 1 answer







The voltage of the single phase supply to residential consumers is (a) 110 V (b) 210 V (c) 230 V (d) 400 V
Last Answer : (c) 230 V

Show More

14 views 1 answer








Last Answer : The stator of phase shifting transformer for use in conjunction with an A.C. potentiometer usually has a two-phase winding.

Show More

173 views 1 answer







Constant voltage transmission entails the following disadvantage (a) large conductor area is required for same power transmission (b) short-circuit current of the system is increased (c) either of the above (d) none of the above
Last Answer : (b) short-circuit current of the system is increased

Show More

12 views 1 answer







Which of the following is the demerit of a 'constant voltage transmission system' ? (a) Increase of short-circuit current of the system (b) Availability of steady voltage at all loads at ... of carrying increased power for a given conductor size in case of long-distance heavy power transmission
Last Answer : (a) Increase of short-circuit current of the system

Show More

19 views 1 answer







How is the GTO turned off? A) By using a commutation circuit B) By applying reverse gate pulse C) By using a latch-up circuit D) By reverse anode current pulse 
Last Answer : How is the GTO turned off? A) By using a commutation circuit B) By applying reverse gate pulse C) By using a latch-up circuit D) By reverse anode current pulse 

Show More

241 views 1 answer








Last Answer : SCR turned off when the anode current falls below holding current.

Show More

924 views 1 answer







In AC.S.R. conductors, the insulation between aluminium and steel conductors is (a) insulin (b) bitumen (c) varnish (d) no insulation is required
Last Answer : (d) no insulation is required

Show More

9 views 1 answer







Draw and explain pneumatic proportional controller.
Last Answer : Explanation : Basic : Proportional control is one in which the process input is change in direct proportion to the error(t) controls the output so that the manipulated variable and the error has proportional relation. ... the MV and SP reference value called as error Given as :  Error = SP - MV

Show More

120 views 1 answer







Explain Keypad controller.
Last Answer : Keypad Controller: It's a device which interfaces between the computer and keyboard. That is a input device and used for transfer the data to connected device.

Show More

305 views 2 answers







What is the purpose of auxiliary controller in substation?
Last Answer : The systems of substation auxiliaries ensure operation of substations providing internal consumers of substations with operating direct and alternating currents. Any breakdown (loss) of auxiliary systems ... whole substation, as well as serious problems during its subsequent putting into operation.

Show More

93 views 1 answer







Define Integral controller. State their advantages
Last Answer : Advantages of integral control action: 1) Improves steady state response 2) Removes offset error in the process variable. 3) Eliminates steady state error

Show More

94 views 1 answer






Show More⇦ PreviousNext ⇨