Answer / uditparashar

v/f control means controlling the motor with constant torque by varying the voltage (V) or Frequency (F) as torque is proportional to ratio v/f

Can VFD step up to 60 Hz if it is designed to receive 50 Hz input?

3 Answers  

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why do we use star-delta starter. what is its need?

6 Answers  

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How to Select a Transformer Rating ?

3 Answers   Tata Steel Limited, Techno Electric and Engineering, Vedanta,

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what happens when a dc shunt motor fed with an alternating suppy ?

1 Answers  

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describe your self.

2 Answers   Amazon, Bechtel,

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What is the difference between synchronous asynchronous memory?

1 Answers  

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An automatic water heater is an example of which type of control system?

0 Answers   GE,

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i seen a 132kv/11kv transformer,and thier is a sugar factorys 10MW EXPORT PLANT,MY QUESTION IS THAT WHEN THEY EXPORT ELECTRICITY THEY USE THE SAME TRANSFORMER AND THE CONNECT IT TO 132/11KV TRANSFORMERS SECONDARY SIDE CAN ANY ONE EXPLAIN IT.. THE TRANSFORMER IS OF KIRLOSKAR MAKE AND IT HAS TAP CHANGER.

1 Answers  

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Three set (each phase contain 2 cable of 400 mmsq CU XLPE AWA) of single core cables are connected to 11 KV motor of 14 MW & the switch gear supplay is taken from 11kv feeder & this supplay taken from 275 KV substation. Problem is one pair cable(L3- 2 cable ) getting very hot & gland melted and damaged in switch gear side. the other two cable haven't any more hot(ambient temp only & L3 haveing 95- 100 Degree C. The same problem happened in 275 KV substation switch gear side also where the supply taken for 11 kv switch gear. But here L2 phese cable had problem. Why it is happening like this?. The cable having temperature different at different location from gland side inthe case of 11KV feeder of 275 kv substation. why ?

2 Answers  

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How does a battary stores charge in it? please explain in simple manner and in detail.thanks

0 Answers  

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If DC supply is given to a transformer it may a) Work b)Not Work c)Give lower voltage than the rated voltage on secondary side. d)burn the winding

12 Answers   wbsedcl,

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how to calculate the capacitor to maintain power factor?

0 Answers   Bosch,

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