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Commutation in a rectifier: Refers to the process of transfer of current from one device (diode or thyristor) to the other in a rectifier. The device from which the current is transferred is called the "out going device" and the device to which the current is transferred is called the "incoming device". The incoming device turns on at the beginning of commutation while the out going device turns off at the end of commutation.
Commutation failure: Refers to the situation where the out going device fails to turn off at the end of commutation and continues to conduct current.
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Natural commutation is used in which kind of circuit?
phase controlled RECTIFIER circuit used Natural Commutation......
What is load commutation?
it is a type of forced commutation technique of thyristor
What is the difference between current and voltage commutation?
Voltage commutation: This is possible in ac circuits...The thyristor gets turned off by reverse bias (negative half cycle) voltage applied across it. This is also called line commutation. Current Commutation: This is possible in dc circuits ...This type of commutation makes use of auxiliary circuit which contains inductor,capacitor,diode and even a thyristor(auxiliary). This is called Forced commutation.
What are the problems of commutation in a DC generator?
1.resistance commutation 2.e.m.f commutation
Which rectifier has good efficiency?
bridge rectifier is the best rectifier.
Natural commutation is used in which kind of circuit?
phase controlled RECTIFIER circuit used Natural Commutation......
What is overlap angel of a thyristor?
Overlap angle of a rectifier (μ): The commutation process in a practical rectifier is not instantaneous. During the period of commutation, both the incoming and the outgoing devices conduct current simultaneously. This period, expressed in radians, is called the overlap angle "μ" of a rectifier. It is easily verified that α + μ + γ = π radian.α= Firing angelμ=Overlap angelγ =extiction angel
What is natural commutation of silicon controlled rectifier?
NATURAL COMMUTATION:Commutation of current from one switching device to another in a power electronics converter at the instant the incoming voltage has a higher potential than that of the outgoing wave, without the aid of any commutation circuitry.
What are the types of commutation?
Two types of commutation process 1) Natural commutation 2) Forced commutation
How commutation can be improve?
Generally there are two methods of improving Commutation :- 1.Resistance Commutation 2.Emf or Voltage Commutation The Commutation can also be improve by using interpoles and compensating windings.
What is load commutation?
it is a type of forced commutation technique of thyristor
What is commutation of thyristor?
the process of turning off of a thyrisror is known as commutation
What is the difference between current and voltage commutation?
Voltage commutation: This is possible in ac circuits...The thyristor gets turned off by reverse bias (negative half cycle) voltage applied across it. This is also called line commutation. Current Commutation: This is possible in dc circuits ...This type of commutation makes use of auxiliary circuit which contains inductor,capacitor,diode and even a thyristor(auxiliary). This is called Forced commutation.
What are the problems of commutation in a DC generator?
1.resistance commutation 2.e.m.f commutation
What is a line commutation?
it is the natural commutation ...by making open circuit or short circuit on the thyristor to make it turn off.
Which rectifier has good efficiency?
bridge rectifier is the best rectifier.
Definition of last pay drawn?
last pay drawn meaning? what is basic pension is it pension before commutation or after commutation?
