Answer / r.c.tiwari

becouse at the time of starting motor take high current
very less duration & over load relay generaly made by
bymatelic contect elements.by matelic element take a time
for heating.so over load rely not trip at the time of
starting.

Answer / ikab

when motor starts high Inrush current flows,
Relays are made smarter/biased to sense this Inrush current
and wait to let this current vanished. Inrush current has 2nd harmonics components and this makes it easy to recognize this current from normal current.

Answer / simon peter

Since the starting I of the motor is high but the tripping value is rated onthe basis of short or earth fault occured.....

Answer / shalini

In a star delta connection, OLR will be placed in the
dealta side.
Starting current would be high during the star connection &
timer will be set to switch over from star to delta.
Once the delta connection is activated, the current would
be naturally less & therby OLR doesnot trip.

Answer / lokesh

As simple one, we are using the starters ( DOL, Star Delta)
liket that for this purpose.

So this starter will help to start the motor with reduced
starting current.

Which capacitor is preferred for high voltage and frequency?

0 Answers  

---

What is the cut-off rate?

0 Answers  

---

How can we calculate C10 rating of a bttery from c5 or c20 ratings??

1 Answers   Intel,

---

1KVA transformer of different frequencies of 50hz,100hz,500hz&1000hz. which one of these transformer has big size? Give reason

16 Answers   Ecil, Engineers India, MahaDiscom,

---

In UPS what does 600va reffer to?

4 Answers  

---

---

why we use iron corn in transformer instead of wooden core

12 Answers  

---

why can tv operate at low voltage??

2 Answers  

---

If Three Runs of 1Cx300 Sqmm Cable between Transformer and VCB and the distance between 100mtrs. what will be total length of Cable and if cost 1500Rs per meter,what would be the total cost

1 Answers   ANITS,

---

After taking shutdown of 11kv feeder, if you see 5kv by phasing stick in the cable side, is it possible to close earth switch in cable.

0 Answers   KSEB, L&T, Siemens,

---

We all have seen transmission and Distribution lines In transmission lines the voltage is high and current is low(to reduce I^2r loss) and in distribution lines voltage is low but current is high however the size of transmission wires is bigger than that of distribution wires even though the amount of current carried by the distribution lines is more than that of transmission lines why?

4 Answers  

---

How to clear BHEL written test exam.....anyone having experience pls refer me the link were i can get BHEL question papers....

1 Answers   Bhel,

---

sir iam from electrical and electronics branch ,can i appear for the hpcl offline requirtment? if yes please mail me on vikram_raju25@yahoo.co.in

0 Answers   HPCL,

---