Answer / vijay

vvvfd means varieable voltage variable freqwency drive.

Answer / iamdon

The electric drive which uses variable voltage and variable
frequency for its operation and control is called VVVF
drives.With the technology improvement in the realm of
power electronics now it is more easy to work with VVVF.
Cycloconverters are employed to obtain variable frequency
up to 400Hz.

VVVF find applications in railways traction,airplane etc.

Author:arbelectbit@yahoo.com

Answer / shashi bhushan

generaly AC drive supplied with AC voltage , but where we
need variable source , there we use VVVFD(variable voltage
variable frequency drive).
raquirement for VVVFD.......
1.ac source
2.rectfier circuit.
3.filter circuit.
4.inverter circuit
5.IGBT

Answer / kaushal

varible voltage and varible frquency drive

what is the full form of XLPE adn there use.

4 Answers   Voltas,

---

Why the field rheostat is adjusted such that the voltmeter reads 380V

0 Answers   SRM University,

---

why the transformer is not operates on two phase?

1 Answers   APGenco, Atkins, FFBL,

---

How can calculate HT side VCB? For example I have 1250 KVA load what will be HT side VCB Amp.range and what size XLPE cable I use for HT side.

2 Answers   NASSA, Orchid, SB Automation,

---

If u have 60KVA UPS, than tell me how systems ( computers ) u may connect?

3 Answers   Thomson Reuters,

---

Where we use 30mA , 100mA & 300mA RCCB ?

3 Answers   BEL,

---

what is the difference between induction and synchronous motor?explain in simple words?why 3 phase motor is given preference over single phase motor.

10 Answers  

---

What is the Operating Powerfactor of UPS??? Why??

3 Answers  

---

we have 2.2kw,Y,3000rpm motor but 6leads found in TB what happen if we connect in delta?

0 Answers  

---

why transformer capacity is called KVA and motor capacity is called HP/KW? Why transformer capacity cant call HP/KVA?

5 Answers  

---

what is the difference between electrical wire and electrical conductor?

4 Answers  

---

What is difference between MCC,PMCC,PDB?

2 Answers   Cipla, JSW,

---