ramu


{ City }
< Country > india
* Profession * elec engineer
User No # 78756
Total Questions Posted # 0
Total Answers Posted # 25

Total Answers Posted for My Questions # 0
Total Views for My Questions # 0

Users Marked my Answers as Correct # 144
Users Marked my Answers as Wrong # 32
Answers / { ramu }

Question { 5508 }

what is the bus bar size of 2700 amp ACB breaker ? and what is
the cable size ?pls detailed answer ?


Answer

Bus bar = 2 nos of 200 X 12 mm Al
Cable = 5 R X 3.5 C x 630 Sq.mm Al

Is This Answer Correct ?    7 Yes 0 No

Question { TATA, 5152 }

Whats changes in Transformer Oil BDV in changes in temp or
Climate?


Answer

BDV increases with increase in temperature and lowers in cloudy climate.

Is This Answer Correct ?    3 Yes 0 No


Question { Wipro, 4971 }

I NEED THE CABLE SIZE. I=800A AND P=315KW


Answer

To get accurate size give voltage, length, application and method of laying.
However 3 r X 300 Sq mm is ok.

Is This Answer Correct ?    0 Yes 1 No

Question { ABC, 6042 }

What will happen if 2 phase supply is given to 3 phase
motor?


Answer

It will not start at all but draws more current and trips on locked rotor protection failing which it burns.

Is This Answer Correct ?    10 Yes 1 No

Question { JK Associates, 9625 }

Why Dyn11 Transformer is selected for distribution transformer?


Answer

Since Distribution, LT requires neutral, hence star winding.
As already one winding is star, the other one i.e, HT will be in delta(to provide path for 3 rd harmonics). Now 11 is the standard phase angle for vectors for easy connection. 

Is This Answer Correct ?    9 Yes 5 No

Question { 7511 }

1 sq mm conductor=? how many amps


Answer

1 Amp for Aluminium and 1.5 A for Copper after considering all derating factors.

Is This Answer Correct ?    3 Yes 2 No

Question { Coca Cola, 8719 }

I have a transformer 3phase 11kv/410v and its name plate missing. now how can I judge its rated kva?


Answer

Measure size of 11 KV winding wire ( near HV Bushing or tap changer0 and find out current by using a current density of 3 A/Sq.mm and then KVA.
 Ex : HV Conductor Size = 60 Sq.mm  i.e I1=180 A So KVA = 3500
     and cross check with LV conductor size which will be
     1650 Sq.mm. 

Is This Answer Correct ?    6 Yes 0 No

Question { L&T, 7651 }

Why the transformers making noise?


Answer

Due to Magnetostriction.

Is This Answer Correct ?    14 Yes 2 No

Question { G&S Construction, 5076 }

We order Dyn 5 distribution transformer to a company. What arrives is Dyn 11. Is it ok to use this transformer.
It will be installed alone.


Answer

If it is a standalone installation and for general purpose Dy11 is OK. But why you have ordered Dy5.

Is This Answer Correct ?    2 Yes 0 No

Question { DLF, 9463 }

why ht line fuse wire is so thin


Answer

Because current is very low in HT.

Is This Answer Correct ?    4 Yes 2 No

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