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
How would you calculate power loss in a resistor?
Dry type transformers
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?
3 phase Motor will be given 2 phase after 2 to 5 second we given 3rd phase so Motor Run sum-time in forward or sum time run reverse direction. All time phase sequence is not change. Why motor run in reverse direction? Please Explain........
how can you calculate fault level ?
what is the preventive maintence for ht panels and busbars and vcb abd acb's.
how many safety really of DG sets.
What is block diagram?
What is difference between SMC supportg and Glass Fibre Reinforced Plastic Support.
give me atleast four differences between circuit and network
how hydrogen cooled alternator undergo maintanence ? that is hydrogen when come in contact with air can result into explosions .
Explain about 3 phase motor fault current calculation with examples?
what is cogging and crawling
What is the de rating factor of cable? What is the importance of the de rating factor in cable select
Explain what is clipper and clamper circuits?