What is mean by forced commutation of thyristor?

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asked Sep 21, 2017 by anonymous

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asked Sep 21, 2017 by anonymous

What is mean by natural commutation of thyristor?

Last answer: Natural commutation is also called as line Communication. The turning off of thyristor due to AC supply is called natural commutation or line commutation. If the thyristor is connected to AC supply ... connected to positive and anode terminal get connected to negative, this turns off the thyristor.

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asked Oct 13, 2019 by anonymous

Differentiate between Natural and Forced commutation

Last answer: Natural commutation Forced commutation Source is AC Source is DC External commutating componants are not required External commutating componants are required SCR turns off ... in controlled rectifiers, AC voltage controllers etc. Used in choppers & inverters etc

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asked Sep 10, 2017 by anonymous

what is thyristor commutation?

Last answer: Thyristor commutation means turning off thyristor.

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asked Dec 31, 2017 by anonymous

In a thyristor D.C. chopper, which type of commutation results in best performance ?

Last answer: voltage commutation

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asked Jul 31, 2019 by Muzamil

In a GTO, forced turn-off is achieved by applying following voltage/current in the gate 1) +ve voltage 2) +ve current 3) -ve current 4) -ve voltage

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asked Feb 20, 2018 by anonymous

What is the difference between beta and forced beta for BJT?

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In a 3-phase converter circuit during commutation when one SCR in one phase is turned on to turn-off an SCR

In a 3-phase converter circuit during commutation when one SCR in one phase is turned on to turn-off an SCR in another phase, results in (A) voltage notching (B) harmonic distortion (C) voltage sag (D) voltage swell

Last answer: In a 3-phase converter circuit during commutation when one SCR in one phase is turned on to turn-off an SCR in another phase, results in voltage notching

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129 views 1 answer

asked Oct 13, 2019 by anonymous

Class A Load Commutation

Last answer: Class A: Load Commutation: The class A or load commutation (also called self-commutation or resonant commutation) is employed in thyristor circuits supplied from DC source. The commutating components include ... biased. Thus the zero-current and reverse-bias cause the thyristor to turn-off.

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asked Sep 7, 2018 by anonymous

Define natural, mechanical, forced and induced draught systems.

Last answer: Natural draught system: - When the fuel is burnt (combustion) in the furnace due to natural circulation of air, the draught is called natural draught. Mechanical draught system: - In a mechanical ... combustion. OR If fan/blower is placed after the furnace then it is called as induced draught

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asked Mar 19, 2018 by anonymous

What is meant by firing angle of thyristor?

Last answer: The point at which SCR is triggered is known as firings angle of thyristor.

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asked May 21, 2020 by anonymous

Draw circuit diagram of Class B commutation.

Last answer: Class B: Resonant Pulse Commutation:

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asked Oct 13, 2019 by anonymous

Draw a neat circuit diagram of class F commutation

Last answer: class F commutation

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asked Jul 25, 2019 by anonymous

Define commutation. Give the types of commutation.

Last answer: Commutation: The process of turning-off a conducting thyristor is called commutation . Types of Commutation: i) Line commutation (Natural commutation) ii) Load commutation iii) Forced commutation iv) ... Auxiliary commutation v) Class E: External pulse commutation vi) Class F: AC line commutation

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asked Mar 20, 2018 by anonymous

Satisfactory commutation of D.C. machines requires?

Last answer: Satisfactory commutation of D.C. machines requires brushes should be of proper grade and size, brushes should smoothly run in the holders, smooth, concentric commutator properly undercut.

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asked May 21, 2020 by anonymous

For a class D commutation, answer the following: i) Explain the operation with circuit diagram. ii) Interpret with waveforms.

Last answer: Class D commutation: This is also called as auxiliary commutation because it uses an auxiliary SCR to switch the charged capacitor across conducting SCR to turn it off. In this scheme, the main ... make SCR1 forward biased and keep ready for next triggering. The above cyclic process is repeated.

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58 views 1 answer

asked Oct 13, 2019 by anonymous

Class D commutation

Last answer: Class D commutation: This is also called as auxiliary commutation because it uses an auxiliary SCR to switch the charged capacitor across conducting SCR to turn it off. In this scheme, the main ... make SCR1 forward biased and keep ready for next triggering. The above cyclic process is repeated.

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asked Jul 25, 2019 by anonymous

Explain auxiliary commutation with a neat diagram. Also draw its waveform.

Last answer: Auxiliary Commutation At start, the Ta is triggered and turned on to carry the load current. Due to the resonant circuit R-L-C, the current initially rises, attains peak and then falls to ... , the firing of auxiliary SCR commutates the main SCR, hence name is auxiliary commutation.

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113 views 1 answer

asked Sep 21, 2017 by anonymous

can we turn off thyristor using Gate?

Last answer: No we cannot turn off normal thyristor using Gate.

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asked Sep 21, 2017 by anonymous

when a thyristor conducts?

Last answer: Thyristor conducts when the anode voltage is greater than cathode and when the current provided to Gate.

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asked May 8, 2018 by anonymous

Thyristor can be protected from over voltages by using

Last answer: Thyristor can be protected from over voltages by using Voltage clamping device

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asked Sep 10, 2017 by anonymous

thyristor can be turned off by?

Last answer: Thyristor can be turned off by making anode potential equal to cathode potential or by making anode potential less than cathode potential.

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asked Mar 19, 2018 by anonymous

What is the use of a thyristor in a circuit?

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What is the function of a thyristor?

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What is the application of thyristor?

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What is a phase control thyristor?

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What is thyristor family?

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What is a reverse conducting thyristor?

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asked Aug 8, 2017 by anonymous

what is gate turn off thyristor (GTO)?

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).

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asked Dec 6, 2017 by anonymous

what are the disadvantages of thyristor?

Last answer: Disadvantages of thyristor The silicon controlled rectifier (SCR) is unidirectional devices, so it can control power only in DC power during positive half cycle of AC supply. Thus only DC power is ... cycle. It cannot be used at higher frequencies. The gate current cannot be negative

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asked Mar 19, 2018 by anonymous

Why SCR is called as thyristor?

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asked Mar 19, 2018 by anonymous

Is a SCR a thyristor?

Last answer: Yes, SCR is a thyristor. Thyristor is the family and SCR is the member of that family but SCR is universally known as thyristor.

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asked Mar 19, 2018 by anonymous

How is a thyristor used to convert AC to DC?

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Is thyristor a DC switch?

Last answer: Yes ,it is one of the main advantage using thristors as a switch in DC circuit ,it has a high current gain

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asked Sep 10, 2017 by anonymous

why thyristor is called semi controlled device?

Last answer: Thyristor can only be turned on by small gate pulse but it cannot be turn off by using gate hence thyristor is called semi controlled device.

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asked Sep 10, 2017 by anonymous

why thyristor is called latching device?

Last answer: Thyristor can be turn on by positive gate pulse and the current will continue to flow through the device even when the gate voltage is low hence thyristor is called latching device.

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Describe the working principle of Thyristor operated dimmer with the help of circuit diagram.

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asked Dec 7, 2017 by anonymous

parallel operation of mosfet can be done more easily as compared to thyristor. why?

parallel operation of MOSFET can be done more easily as compared to thyristor. why?

Last answer: Parallel operation of MOSFET can be done more easily as compared to thyristor because the resistance of MOSFET is increases with increase in temperature. MOSFET have the positive temperature coefficient. In ... the parallel operation of MOSFET can be done more easily as compared to the thyristor.

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asked May 8, 2018 by anonymous

Leakage current flows through the thyristor in

Last answer: Leakage current flows through the thyristor in Forward blocking mode and Reverse blocking mode.

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Why thyristor are not preferred for inverter?

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Explain thyristor gate drive circuit.

Last answer: Thyristor Gate Drive Circuit: The thyristor can be turned on by pulse voltage signal at gate terminal and it does not require continuous drive signal like the transistor. The gate ... circuit provide required minimum gate voltage and gate current then the thyristor conducts properly.

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write short notes on thyristor CSI .

Last answer: Current-source inverter (CSI) is an inverter with a DC current input. Current source inverters are most commonly used in very high power AC motor drives.

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asked Sep 21, 2017 by anonymous

thyristor have how many terminals?

Last answer: Thyristor have three terminals anode, cathode and Gate.

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Thyristor Switched Capacitor (TSC)

Last answer: Thyristor Switched Capacitor (TSC) TSC is a static compensator. TSC is use for compensating reactive power. Compensation is required for voltage regulation, increasing stability, ... compensating device like TCS phase angle between voltage and current can be maintain.

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anonymous · Answer 1 · 2017-09-21T16:52:50+0000

By using some circuit the forward DC current of thyristor is forced to zero is called forced commutation.

What is mean by forced commutation of thyristor?

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