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Which portion of the power system is least prone to fault?

Which portion of the power system is least prone to fault? Correct Answer alternator

Fault Statistics:

​⇒ The Overhead lines have more prone to fault than other equipment and it is 50 %  

⇒ The Alternator has least  prone to fault than the above option

Equipment 

% type of faults 

Overhead line 

50

Switchgear

15

Transformer

12

Cables 

10

CTs & PTs

2

Control Equipment

3

Miscellaneous(Alternator)

8

 

Key Points

→ Majorly alternator affected by the internal fault like overloading, reverse power, Negative phase sequence

→ The alternator protected by the use of  "Merz prize differential relay ''

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