Answer / mahesh sali

THE FUNCTION OF VFD ( VARIABLE FREQUENCY DRIVE ) IS TO
CONTROL THE SPEED OF THE MOTOR , TORQUE , CURRENT BY
CONTROLLING THE FREQUENCY .

THE FREQ. CAN CONTROL BY CONTROLLING THE FIRING ANGLE OF
SCR.

Answer / chetan

vfd-variable frequency drive
as its name explains its function that by changing the
frequency of the power supply fed to the motor we can
change the speed of the motor as N=120f/p
where f is frequency
p-no. of poles
N- speed of motor
In vfd there are SCRs and the frequency can be changed by
controlling the firing angle of the SCRs.
VFD have alot of advantages over simple starter the bigest
one is energy saving.

Answer / maheswaran.d

enargy seving &speed control unit

Answer / j venkteswaran

VFD is for controlling the speed of the motor by adjusting
the frequency and voltage.
If voltage decreases frequency will decrease,if voltage
increases frequency will increase this is the general
principle as V/f ratio

Answer / ritesh mane

VFD is Voltage & Freq ratio with the help of these to
factors we can cntrol drive speed N .V/F ratio

Answer / amit saha

VFD MINING VARIABLE FREQUENCY DRIVE. VFD IS TO
CONTROL THE SPEED OF THE MOTOR, TORQUE, CURRENT BY
CONTROLLING THE FREQUENCY .

BY AMIT SAHA

Answer / mahesh

IGBT using pulse with modulation

Answer / muhammad imran jalal

The function of IGBT in VFDs is to chopp the DC voltage in
relation to original sine wave entering in the rectifier
section of the VFD. the switching speed of IGBTs is very
high as compared to Bipolar Transistors. Energy is saved in
VFDs by Affinity laws.


Imran Jalal
Electrical Engineer

Answer / c.sakthi

vfd means veriable frequncy drive and this vfd used motor
is starting energy saved and power cable cost saved speed
control is easy

Answer / tera baap

MADERCHOD MAINE AAJ TAK VFD NAHI PADHA HAI TO ANSWER KYA DU
BHOSRI KE

234 MVA Generator 3 phase Short circuit current Values required? Gen set Rating-234 MVA, Gen Voltage-18kv, PF;0.8, Xdv:23.5 %, Transformer Rating-18/380KV, 680MVA,Yndd1 two winding, Step up TR, ZT:35.50 %,X/R 4.33 Gen CB Position, CB open ,Disconnected open, Generator Running Voltage 18 Kv, Bi mistakes generator side earth switch Closed during that time short circuit current level in 3 Phase required, and how to test on site 234MVA Generator Short circuit current,

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