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

Name of the relay of low lub oil presuure in DG sets

0 Answers   Lineage, Sterling,

---

what is the difference between old fan regulator and new fan regulator

1 Answers  

---

What type of surgery impedence with 200ohs 

1 Answers  

---

What are the Safety measures in central chiller plant? Explain them?

22 Answers   Carrier, CPIC, HSL, JLL,

---

what is difference between 2wire method and 4wire method of winding resistance testing of transformer?

1 Answers  

---

---

keeping in view of parallel operation which of the 3 phase transformer connection are possible? a)delta-delta to delta-star b) delta-delta to star-delta c) star-star to delta-delta d) delta-star to star-delta

4 Answers   Ecil, Siemens,

---

Why does not AC excitation use in rotor of AC Generator instead of DC excitation?

2 Answers   A2Z Group,

---

Why CT secondary should not be kept open?

7 Answers   Anna University,

---

describe the fully control circuit diagram of ac drives

0 Answers  

---

What are the types of instrument transformer?

0 Answers  

---

What is BMS System???Types...

4 Answers   Emerson,

---

Dear sir, I am working in wind mill division , pls explain Pls explain in details with formula My question is Wind speed 3.5 M/s Gen RPM is 1500 ( 25 K/w Production ) Wind speed 12 M/s Gen RPM is 1500 ( 220 K/w Production ) Why in 3.5 m/s generation was low , why in 12 m/s generation was high , Pls dont explain wind force or wind density , that one already i know For the above question RPM was same why the KW was different Answer : 1. Its depends on the density ( Force ) of the air Sir , Pls explain wit Formula sir

1 Answers   Vestas,

---