Answer / sumit mishra from areva t&

Protection required for dectection of abnormal(fault) condn
in case of generator are called generator protection.

Proetction req is based on the rating of the generator.
Following are some protection req in case of Generator.
1.Under/over voltage
2. Under/Over freq
3. Reverse Power
4. Differential Protection
5. Voltage controlled/restrained O/C
6. Loss of Filed
7. Stator E/F
8. Rotor E/F
9. Negative sequence/unbalance
10 Pole slipping etc..

we have consol make 3 phase servo stabilizer for cnc m/c. while installing the earth neutral voltage is 1.7 volts at stbilizer off condition and when stabilizer get on en voltage reaches 4.8 volts (new earthing is done and neutral is helthy condition all phase to neutral volts 440,442,441 v)why this happen.solution for cause.

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