Answer / j.karthik(cce)

Generator Protections are:

1. over current protection
2. Earth Fault protection
3. under voltage protection
4. pole slipping protection
5. under frequency protection
6. Impedence protection
7. df/dt protection

Transformer Protections are:

1. Differential protection
2. winding temperature protection
3. Oil temperature protection
4. overcurrent protection
5. Earth fault protection
6. undercurrent protection

Note:

The protection relays are increases deponds on the ratings
of the Transformer and Generator...

Answer / parmod kumar

Generators Protection's are

1. over current protection
2. Earth Fault protection
3. under voltage protection
4. under frequency protection
5. Reverse Current Protection
6. High Water Temperature Protection
7. Low Coolent Water Level Protection
8. Over Speed Protection
9. Low Lub Oil Pressure Protection

Transformer Protections are

1. Winding Temprature Protection
2. Oil Temprature Protection
3. Bucholz relay protections
4. overcurrent protection
5. Earth fault protection
6. undercurrent protection

Answer / n k singh

Generator protection means protecting the generator in case
any abnormality occurs on generator and transformer
protection means protection of transformer in case any
abnormality occurs on transformer.
General generator protections are:
1.U/F Protection
2.U/V Protection
3.Excitation failure protection
4.Protection against prime mover failure.
General Transformer protections are:
1.Overload protection
2.Ground /Earth fault protection
3.Restricted earth fault protrection
4.Winding temperature high protection
5.Winding protection.

why square root 2 is multiplied with line voltage in selection of LA ie 11/sqrtroot3=6.35 kv and it is multiplied with sqrt2 ie 6.35 KV*sqrt2=8.9 kv we will select 9kv.my question is why we are multiplying with sqrt 2?

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