Answer / zan

yes i agreed..

A flyback diode( sometimes called free wheelingdiode)
reduce harmonics and also it reduce the voltage spike seen
occure in an inductive load.

Answer / durga05

A Free Wheel Diode (FWD) at the output of a full wave rectifier will:




1) Increase DC voltage for a given firing angle due to the elimination of negative portions of the instantaneous dc waveform in a SCR phase controlled converter,




2) Will reduce the generated ripple voltage on the DC side of a SCR phase controlled converter due to same reason as in above, reducing the filtering requirements.




3) Will improve the input PF in an SCR phase controlled converter due to ending the input current waveform earlier by permitting internal free-wheeling.




However, the above will happen only if (a) the DC side has sufficient inductance either as filter or as part of load, (b) the firing angle is more than 30 deg for 3-phase, only after which the negative portion appears. Note that there will be no benefit in a diode rectifier since the FWD is always reverse-biased.




Also note that use of the FWD prevents operation of the SCR converter in inversion mode.

Answer / shubham

along with harmonic reduction, it also reduces sparking and
arcing across the mechanical switch (if being employed)

Answer / guest

Supplies the voltage at negative vlotage

how i decrease the neutral to ground voltage , thats i read 7v on my digital meter.i dont know about my earth pit.

2 Answers  

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Why do we use 36KV LAS for 33kv line and 9KV LAS for 11KV line?

1 Answers  

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how does a shunt reactor maintains the bus voltage???

0 Answers  

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What are methods to avoid the inrush current at the time of starting of power transformer ?

8 Answers   Wipro,

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what is the current density of copper & alluminium.

0 Answers  

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Can be ammeter and voltmeter used without CT? if not, what is the reason for that?

3 Answers   Elektrotek, Toyo Engineering,

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what is effect of 5amp fuse on 2mva pry protection of transformer

0 Answers  

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how to calculate the transformer losses.

4 Answers   Cipla,

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Why two main buses and one transfer bus scheme not using for 400kV switchyard

5 Answers  

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why do we prefer alternating current in india where as in USA prefers DC?

3 Answers   Bhel, GMR, Texmo,

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If we says that current is flow only when there is closed path & neutral work as a return path for the same. Then how circuit is closed in three phase as no neutral available ??

1 Answers   Nimbus Harbor Facilities Management,

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1. for eg, capacitor is used for many purposes(it act as filter, oscillator, bypass capacitor, memory storage etc...) 2. Please tell me some example circuits for different uses of capacitor( whenever and whereever and however we used capacitor as a filter, oscillator tuning etc..) 3. similarly for inductor and resistors(it act as what?) and when and how we want to act as like that?, and how we can used these components depends upon our requirments with example circuits and explanation? design to act as these components depends

0 Answers  

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