UNIT V

Transformer Protection, Generator Protection,

3 Phase Induction Motor Protection

Q1) Name the fault occurs in generator.

Q2) What are the faults occurs in stator?

Q3) Name the possibilities of abnormal condition.

Q4) Name the possible transformer faults.

Q5) What are the problems encountered in differential protection?

Q6) Explain Restricated earth fault protection.

Q7) Explain Buchholz relay with neat diagram.

Q8) Explain Current inrush phenomenon.

Q9) What do you mean by incipient fault?

Q10) What are the Merz price protection schemes for transformer?

Q11) What is overfluxing? Explain protection scheme against it.

Q12) Explain protection scheme against inrush current.

Q13) What do you mean by abnormal operating conditions?

Q14) Explain following with protection scheme

i) Overspeeding                                ii) Overloading

Q15) Explain following with protection scheme

i) Loss of Prime mover                      ii) Loss of Excitation

Q16) Explain Longitudinal percentage differential scheme.

Q17) Expalin Transverse percentage differential scheme.

Q18) What are the different faults occurs in 3 phase Induction motor?

Q19) Explain single phasing protection in case of Induction motor.

Q20) Explain short circuit protection in case of Induction motor.

Q21) Explain overload protection in case of Induction motor.