Answer Posted / arvi

It is interesting how much wrong answers can be gained with
one simple question. I assume that all people answered are
somehow involved with above mentioned theme. To avoid
problems and cost for you in future I´ll give you few hints.
First of all I want to remaind to everybody that
transformers are normally custom made equipment and to
answer this all transformer data has to be presented. Same
well you can ask how far can you drive with the car having
150kW engine!!!
1. I presume that such big transformer feeding not much
equipmnt stating its elektrical KW. On your engine
nameplate you find mechanical kW on engine axe. It has
nothing to do with engine electrical kW.
2. Transformer load is always calculated in Amps. And that
is information what you can always find on all and every
el.equipment as well as on the nameplate of your
transformer. Simple as that.
3. In normal cases you can not presume how many Amps you
will use as it is depending on the load on your equipment
what is varying in real life quite much. So you or use max
Amps stated on nameplates or expected Amps by your
specialists or you set up the Ampmeter and measure it.
4. Normally you dont want to load your transformer
permanently more than 75% as there are always swiching
processes giving load jumps upto few times more than the
full load of your transformer
5. It is very important to consider permanen distortion
level what your equipment emissing back to transformer and
the distortion level coming from higher voltage side. This
is complicated issue what is quite simple to measure, but
for that you really need specialist.
6. Distortion creators in your network are lighting,
smartequipment, variable speed drives, office technology,
UPS systems etc. If you dont have special converter type
transformer then you have to degrade the allowable load as
much you have the distorting equipment. If you have all the
load distorting for example then you dont want to load your
transformer more than half power only. To be honest then
even less, but its again depending on the type of
distortion.
7. Easiest and cheapest is always to ask specialist giving
you stright and exact answers. Trust me - it always pays
back. In this forum you have had answers from the level of
housewife to secondary school students. They are partly
right but non of them giving you really full answer.

What is the vector group of a transformer,how can it be found out?

1998

---

If we need4× 50mm sq cable but it's not available so we can pull 4×25mm sq 2cables

1396

---

Air circuit breaker safety

1347

---

how maney type tempereture measurement ?

2203

---

What are the main significances of root locus?

1176

---

2. A current i=(10+10 sin t)amperes is passed through MI type ammeter. its reading will be.........

2275

---

we have 3.5MVA-11/6KV transformer. how can we calculate earth fault current and NGR calculation?

1481

---

What is the maximum number of swithes that can be connected in series up to down stream point in an LV Distribution system?

1943

---

why do we need to use 3c+3e cable, normally i select only 3c+e cable and i think it is enough. pls explain the usefull of 3e cable ( in this project the earthing system is well done)

2413

---

what is the benefit of floating our DC source? if i have two floating DC source of which 1 has a ref voltage of -21VDC and the other of -18VDC. can it be connected in parallel to share a common ref voltage? if not, how do i make both sources to be of common ref voltage? tks

1837

---

what will happen if there is a voltage leakage or current leakage in an electrical train

1949

---

can anybody send the rrb chennai &rrb bopal question papers of 2006&2007.My exam is on 12 oct 2008.Its urgent

2003

---

percetans

2126

---

what is the difference between 2 way and 4 pole selector switch???

2374

---

what are carbondioxide and dcp used in fire extinguishers

2010

---