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

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