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 does oil cools the transformer

3 Answers   HBL Power Systems,

---

electical engg basic question

1 Answers   Power Plant,

---

What are the two segments of nyquist contour.

0 Answers  

---

At what factor resistance r of a conductor depends?

0 Answers  

---

what is the instrument used for measuring insulator RESISTANCE

5 Answers   TATA, Transco,

---

what is the working of vfd drives.

2 Answers  

---

Why the capacitor are connected in Delta(Three Phase) for power factor improvement ?

5 Answers   Hero Honda,

---

In a transformer ,when voltage decreases current increases. but this is a violation of oms law.why?

15 Answers  

---

can u please mail me the syllabus for GET exam for damodar valley corporation?

0 Answers  

---

what is maintenance?how to explain

0 Answers  

---

what is meant by AYFY Cable?

9 Answers   XLPE,

---

what are the basic concept to design a out door Substation?

1 Answers  

---