Answer / amit pandey

it is the ratio of actual quantity to base quantity.

Answer / xxx

per unit impedance of a transformer is the fraction of the
voltage applied when the current is equal to the rated
current when the terminals are shorted.For example, if a
transformer has 0.05 pu impedance (on percentage terms, you
say that transformer impedance is 5%), full rated current
will flow in the primary and secondary if you apply 5% of
the rated voltage to the primary after short circuiting the
secondary terminals.In other words, if full voltage is
applied to the primary of the transformer and the secondary
terminals are shorted, the current will be 1/(p.u
impedance) p.u. ie; in the above example of the transformer
with 5% impedance, the current will be 20 p.u. (ie; 20
times the rated current).
This definition can be extended to other electrical
appliances also.

Answer / jignesh

10 db

3-PHASE 15KVA dg IS EQUIVALENT TO 12 KW,hOW?

2 Answers   TATA,

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1)why the transformer rating in KVA insted of KW 2)why the secondary of ct is shorted and why the PT secondary is open

3 Answers  

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is there any difference in reading or error in value, if we connect the R phase in Y terminal and Y phase in R terminal of electronic energy meter of 11 kv feerders???

1 Answers   KSEB,

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how to stop oil leakage in power transformer.

1 Answers   APGenco,

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what is meant by substation?

5 Answers  

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What is motor type DG starter

5 Answers   EFS, HDFC,

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During he starting up of the motor, the upstream's MCCB (350A) always trips due to the UVT relay activated. Can Star-delta starter use for a 20kW Motor (For a powder mixer machine) cause voltage-dip in the supply line voltage? If so, what are the recommended solution to eliminate/reduce the transient voltage dip in the line voltage?

4 Answers  

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how to calculate singlephase motor efficiency?

0 Answers   Alstom,

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v=r*i this means when voltage increases current also increases at constant resistance.... p=v*i this means when voltage increases current decreases to maintain the power constant which one is true...

3 Answers  

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What is the difference between hot and cold loop testing?

0 Answers  

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kindly send me 11KV MV motor differential protection procedure by primary injection method.

0 Answers  

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difference between earthing and grounding?

2 Answers   ABB, Bharti, L&T,

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