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Question
what is the VVVFD and?
 Question Submitted By :: Vijay
I also faced this Question!!     Rank Answer Posted By  
 
  Re: what is the VVVFD and?
Answer
# 1
vvvfd means varieable voltage variable freqwency drive. 
Is This Answer Correct ?    6 Yes 0 No
Vijay
 
  Re: what is the VVVFD and?
Answer
# 2
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
 
Is This Answer Correct ?    5 Yes 0 No
Iamdon
[SAIL/B.I.T.Sindri M.Tech(Control Enginee]
 
 
 
  Re: what is the VVVFD and?
Answer
# 3
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
 
Is This Answer Correct ?    2 Yes 0 No
Shashi Bhushan
 
  Re: what is the VVVFD and?
Answer
# 4
varible voltage and varible frquency drive 
Is This Answer Correct ?    1 Yes 0 No
Kaushal
 

 
 
 
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tate and explain super position theorem   2
how to calculate the powerfactor in induction motor having name plate details? for example 1 h.p motor 1.86 A 415 V   6
I have 500A load (WHICH IS SEPARATE MDP PANEL),an MCC panel with 4000A Breaker.Already I have 2500A load.Can I connect this load directly to the Busbar since I have PROTECTION IN MY MDP Panel ?   3
If we give the 440 V supply at secondary winding of the transformer then what will affect at primary winding???????   6
voltmeter kya hota hy ?   2
While starting a high capacity motor, it takes 6 times the full load current. Why it doesn't trip relay or CB's in that network?   4
what is meant by substation?   4
in Megger what type of voltage(AC or DC) are produce.how they work.   1
I have 2 KW electric water heater.I am gonna use it in controlling water temp.so I needed to increase or decrease the heating capacity.is there any electrical-electronic circuit for varying the resistance & so current?   1
1. what type of winding of slip ring ac induction motor rotor and why. 2. how the heating element use in two phase (415 volt)and what rating of element, you prefered. Simbhaoli-Sugars 1
what is the effect of PF on alternator sizing? Siemens 2
 
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