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Usually commutating Capacitors are used in bistable multivibrators.
To change the states of two transistors in bistable MVs, a trigger is applied.
But due to the capacitance at base of transistor it takes sometime (delay) to change the state.
To overcome this problem Commutating capacitors are used.
So these are also known as Speed up capacitors or Transpose Capacitors as they speed up the operation.
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Operation of commutating capacitor?
Commutation Capacitors are usually switched in parallel to the thyristors.
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.
What is meant by capacitor?
A capacitor is an electrical or elctronic semi conductive material which have the ability to store electrical charge and discharge when needed, and also used for timing a circuit and finally used for filtering in a circuit. A capacitor is made up of two plates seperated by die-electric strength or material. Thanks
Can you by-pass a capacitor in an electric motor?
You can not by-pass the capacitor in an electric motor. Most are capacitor-start motors which require the capacitor to be operational in order to start. If the capacitor is not working then it will need to be replaced.
What is meant by the term capacitive resistance?
That term to me is incorrect it should be capacitance impedance. Resistance is linear impedance. CAPACITANCE will follow a vector caused by the capacitor value.
Operation of commutating capacitor?
Commutation Capacitors are usually switched in parallel to the thyristors.
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 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.
Why a capacitor does not accept AC?
A capacitor conducts AC but do not conduct DC because it is meant to store charge.
What is meant by capacitor charging problem?
storing of energy
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 does forced commutation mean?
The term "Forced commutation" is used when a thyristor is turned off using external components. If a thyristor is used in a DC circuit, when first turned on, it will stay on until the current goes to zero. To turn off the thyristor it is possible to use a Forced commutation circuit. The circuit creates a reverse voltage over the thyristor (and a small reverse current) for a short time, but long enough to turn off the thyristor. A simple circuit consist of a precharged capacitor and a switch (e.g. another thyristor) parallel to the thyristor. When the switch is closed, the current is supplied by the capacitor for a short while. This cause a reversed voltage over the thyristor, and the thyristor is turned off.
Natural commutation is used in which kind of circuit?
phase controlled RECTIFIER circuit used Natural 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.
