Answer / k.prakashchandra

Aux tr is located inside the station premises for the
supply at LT for station's own use only.

Answer / k.prakashchandra

Transformer at a station for self-use.It is normally of
11KV/415V ratio

Answer / kingshuk dey

Auxiliary transformer is any transformer used for a separate dedicated part of the circuit/electrical system and does not supply to other parts.
For example, if you have a Motor Control Center with 5 buckets for 5 motors circuits, you can have one dedicated transformer for each of those circuits for control power. Each transformer will hence be an "auxiliary transformer".

Or you can have one transformer providing control supply to all circuits. That will be your "primary or main control transformer".

The prime reason for using auxiliary transformers is to isolate supplies for each equipment, such that if one is affected/damaged, the others are protected and are up and running. Or sometimes because that particular part of the circuit requires a separate supply. (Like, all other circuits can be controlled by 230 VAC, but one part requires 110 VAC, or you need to give dedicated 110VAC supply to SMPS for 24 VDC to PLC).

which type of harmonics minimum produce in 12 pulse rectiformer transformer? a)3rd b)5th c)7th d)11th

4 Answers   Power Grid, Powerica,

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when we r using 3.5 cable for a bldg. and put laod on each phase using the neutral and neutral is the return paht for the phase so the current of the neutral must be Ir+Ib+iY (return).But the size of the netural is .5 as comper to the phase.

2 Answers  

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In zero voltage we can pass supply to our body means we cant get shock its true ? how we can do it ?

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what is the diffrence between mcb &elcb?

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compare between starting charactristics of synchronous motor with those of 3Q Squirrel cage induction motor

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why in some cases the receiving end voltage is higher than the sending end voltage in transmission line (called 'Ferranti effect') ????? whts the reason behind tht???

3 Answers  

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on which power factor synchronous motor run

2 Answers   Bhel,

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WHAT IS METHOD TO DESIGN SIZE OF A 11KV UNDER GROUND CABLE FOR A OUTGOING FEEDER FEEDING 6NOS 250KVA TRANSFORMERS WITH 5KM LENGTH OF FEEDER?

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What is surge impedence and surge loading....???

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low voltage means how much voltage? extra low voltage means how much voltage? medium voltage means hos much voltage? high voltage means how much voltage? Ex: low voltage - 1volt to 240volt like this

3 Answers  

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How to calculate the transmission losses incase of overhead transmission lines?

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Why carbon brushes are used in motors?

6 Answers   BARC,

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