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 is primary and backup protection?
What is the type of earth fault protection used in battery? explain.
what is mean by dual digital protection in the relay field?
What is electrical diversity factor in electrical installations?
How can I model an open-delta ground transformer for a network supplied by 4 unit GTG and power transformer in ETAP?
describe the constructional features of an auto transformer and its principle operation
How many kw will suply from one db
ii) A shunt motor supplied at 230V, runs at 900 rpm when the current is 30A. The resistance of the armature is 0.4 ohms. Calculate the resistance required in series with the armature to reduce the speed to 600 rpm, assuming that the armature current is then 20A. [12]
how to protect motor in dol starter having capacity of 30 hp.40 hp?
all interview questions with answers of ntpc (2000-2009
can anyone tell me can the electromagnetic waves can be reflected back?if so how &by which material it can be reflected back?please tell me so that it can help to my wireless power trasnmission device.
Name two types of electrical analogous for mechanical system.
What is the difference between AC and DC injection methods for rotor earth fault protection
How is magnetic leakage reduced?
can anybody send me syllabus of rrb section engg (electrical). and also send previous question pepar...