Answer / satya dev

1-Over current & earth fault relay for feedar Protection.

2-reverse power relay for Alternators ( if diffrent
sourcees are used- eg. transformer supply & DG supply)

3-Inverse/differetial relay for Busbar protection.

Answer / vel

over current and earth fault relays (2OL+1EL method)are
used for lv .

Answer / jagadisha.n bmsit

Different protection systems which is used in LV panels are:
1. Short circuit protection :- It is done by choosing set
point in sc protection relay which is present inside the CB's.

2. Thermal protection for Busbars/ cables:- Bec extreme
thermal point cause flash over

3. Over current protection

4.Protection provided by proper shielding & interlocks such
that operator & maintenance people can not accesses live parts

Answer / sachin

1.over current reley
2.earth fault reley
3.fase failure relay
3.fuse moniterning relay.

Answer / nagesh

current protection
1)over current
2)short ckt current
3)Instantanious current
Earth fault relay,
Negative phase sequence
Phase failure
If require
High temprature
High vibration
Safety (door switches)
MD over shoot(MD monitoring)

Answer / vinod

VCB,ACB,MCCB

what is earthing

1 Answers  

how make to Incident and accident report

1 Answers  

how can decide the current rating of oltc

0 Answers  

Practical condition in 400KV Sub station:- Breaker(open) , isolator(open), Earthing (close) at both end e.g A & B. Now Open A Stn Earthing than Open B stn Earthing (Which have a 50MVA reactor) , AND suddenly show R,Y,B phase 704KV,573KV,118KV respectively. Que is without closing of breaker how it is possible.???? My Whats app No:07621840498 for Further Discussion. Pls experts suggest.

0 Answers  

for 750 kw LT load what will be the ht kva

0 Answers   Sterling Tools,

when measure the core loss of three phase distribution transformer or three phase reactor loss, one phase shown negative watt loss. why??

0 Answers  

how to improve power factor correction?

3 Answers  

I want to know how to calculate the size of electricity cable in building?

0 Answers   DR Engineering Services,

What is the effect of positive feedback on stability of the system?

0 Answers  

what is the difference betn earthed and unearthed cables which is commanly used why?

2 Answers   Bhel, Power Grid,

what is parellel power factor correction?

2 Answers   HCL,

Why we use 4-20 mA Analog signal for the PLC input? Why not 0-20 mA? Why not 5-25 mA?

0 Answers