Tripping circuit - Third part for given diagram of relay circuit

Q.  In the following figure, the relay circuit is divided into three parts. What does the third part consist of?
V Curves For Synchronous Generator
- Published on 18 Nov 15

a. Primary winding of a current CT which is connected in series with the line to be protected.
b. Secondary of the CT and the operating coil.
c. Tripping circuit.
d. None of these

ANSWER: Tripping circuit.

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