Answer / raul

the batteries in a station are floated onto the dc bus bars
with the help of float charger i.e. all the dc requirements
r being made with the help of float charger and not by the
battery itself which is done by keeping the float charger
voltage a few volts higher than d battery voltage........in
addition to provide d.c. requirements in a
station .......the float charger provides additional few
hundreds of amperes to the battery to compensate for the
losses in d capacity of the battery due to local action
among the plates of the battery........that is why it is
also called as TRICKLE charger......in case of a.c. failure
in station, battery comes in to play and the battery starts
getting discharged........so in order to keep the battery
charged at its rated values, boost charger comes into play
and charges the battery...........and after the restoration
of the a.c. supply to the station, it is again floated onto
the d.c. bus bars with the help of FLOAT charger........

how to find the transformer effiiency

3 Answers   Bosch,

---

What is the difference between online and offline UPS

1 Answers  

---

what are different types of alternator and discuss about the methods of cooling

16 Answers   Bhel, Jindal, L&T, Nalco, Vedanta,

---

IN WHICH MODE THE TRANSFORMER WILL GET A MAXIMUM OUT PUT VOLTAGE. ASKED FOR POWER GRID EXAMINATION STAT-STAR,STAR-DELTA,DELTA-STAR,DELTA-DELTA

3 Answers  

---

How to calcualte the total number of cells required for particular UPS of some X KVA with 3 and 5 hours back-up?

1 Answers   JLL,

---

How can we decide the fualt levels of sub-stations?

2 Answers   Bhel, Enercon, Prakash Industries,

---

how net resistance islow in star connection and viseversa in delta connection...? if anybody could explain in detail it wud be helpful.

0 Answers  

---

I am final year b.tech student..i applied for gate but i am not interested any of my engineering subjects. i am interested in management wise.. is my option correct after b.tech..

1 Answers  

---

A 11000/415V distribution transformer is fed 415V upon it's LT side,Do I get 11000V upon it's Primary side ?

7 Answers  

---

Total power capacity of india at present

8 Answers   Bhel,

---

where are the circulat the diesel in DG parts name with pictue

0 Answers   SSP, Wipro,

---

does over charging of a battery reduce its life?

4 Answers   KSEB,

---