Answer Posted / sandeep vazhoor
VVVF drive(also called VVVF Inverter) is a power electronic
controller used to control the speed of 3 phase AC Motors
(synchronous or induction) by varying the frequency and
voltage applied to the motor terminals. Voltage and
frequency relationship is decided based on the motor name
plate data and the load characteristics.
Advantages of VVVF Drives are –
a) Stepless speed can be achieved which is required in
process control.
b) Energy Saving.
c) Improvement in productivity.
d) Process improvement and better quality of the product.
| Is This Answer Correct ? | 29 Yes | 4 No |
Post New Answer View All Answers
what topics we have to concentrate for power grid et.written test.and tell what to read for english synonyms and antonyms.
Define conversion efficiency of a power amplifier.
what is 30-phase of transformer
what is kvarh? Please define it With calculation General motors ?
what is doid
What is the type of feedback used in an op- amp schmitt trigger?
what do you mean by type zero control sytem ?Give an practical example of type zero contol sytem?
Dear Brother can u tell the proper size selection of cable & the fault level calculation of braker, busbar etc. pls mail me at azeemk30@gmail.com
sugest any typical project ?
What is Phase margin?
following are the questions asked in interviews: 1) Considering the short circuit fault, which switchgear is preferable, SFU OR MCCB? Which operates faster? whicg one is popular in Indian Market and why? 2)Define SCPD. What is type2 coodination? 3)Why the contactor rating is higher for the fuseless selection than for fuse selection? whether the ratinf of SFU or MCCB remains the same in both the cases? 4)If the HP rating is known then can you calculate the ratings of L.V Switchgear(SFU/MCCB, contactor, OLR) without using the selection chart?
What is the need for a controller?
i have 90kw motor.so i choose connect cable .please what is parameter checked so please give to formula
what is basic difference betmeen normal & flame proof motor??
What is resonant frequency?