Answer / shiva

for any application selection depends on local distribution
(sub station ) transmission ,secondary voltage and finally
depends only on demand KVA of u r plant.

Answer / anuya

Basic & most important factor is transformer capacity which
can be derived by calculating all connected loads at
downstream. It will give the KVA rating.
Primary-secondary voltage ratio & vector group.
Environmental conditions like temp, etc. Application
Indoor/outdoor.
Cooling type requirement will deside the Xmer will be Oil
cooled or dry type unit.
Impedance of the Xmer.
Load type.

Answer / prabhu gnanasekaran

11 KV transformer or anyother transformer the calculation
of the transformer is done only as per the loads connected
in it(Continious load,stand by load and Auxillary load). No
of motors connected to it,KW rating of the mator, Total
line current of all motors.
If it is 11 KV the your primary side of the transformer is
11 KV thats all. Due to this 11 KV the line current
calcultation will change in the factor of system voltage
level in Line current calculation of the motor.

which transfofrmer oil break down voltage strength get will be more if oil sample taken from bottom of tank or oil sample taken from top of the transfomer tank.

2 Answers   NPCIL,

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How multimeter shows phase to phase voltage 440V & phase to neutral 220V.

2 Answers  

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Determine the BTU size of an aircon for 20 sq metre room

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whats was the problem if neutral and earth got 2volt from the ups output

1 Answers  

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Could anyone clarify my wondering. What is the difference between knee point voltage and saturation voltage of the CT. Is their any formula to calculate these values?

2 Answers  

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what happens when parallel resonance occurs?

2 Answers  

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What are the different sizes of cables for H.T and L.T side of supply?

7 Answers   Bhel, BSES, Karthik Industries, Lanco, Nedco, Shilpa Electrical Engineers, TATA, Torrent Power,

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How many gap between finger contact in a.c.b. and v.cb.?

0 Answers  

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What is magneto on a gas generator. how it functions. its out put is d.c or a.c. how it can be checked for correct functioning

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I have been using an 600VA with 0.6 p.f UPS with my desktop which has 450W power supply unit. Can anyone explain how can this happen . Because the output of the UPS is 360W (600*0.6) (<450W)

0 Answers  

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If 11 KV breaker on the primary side of a 11 KV/3.3 KV 12.5 MVA transformer can be installed at a distance of 1000 mtrs through a 11 KV cable. If no what are the probable reasons.

1 Answers  

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Is a contactor (or master relay) required between incoming lines and a VFD? The question goes to safety. If a contactor were used before the VFD and an e-stop engaged then the motor will coast to a stop (i.e. VFD loses power) instead of stopping much faster if the VFD braking fucntion were used. It would make more sense to keep power on the VFD.

0 Answers   Pride Hotels,

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