Class 4 (4th Engineer) MET 📅 May 2024

Exam Question

Overcurrent protection relays are built into main alternator breakers to safeguard the individual alternators and the distribution system against certain faults.

(a) Sketch a typical relay. (8)

(b) Describe the operation of the relay sketched in (a) (8)

Reference Answer

### (a) Sketch of a Typical Electromechanical Induction Disc Overcurrent Relay
**(8 marks)**
A diagram illustrating the construction of an electromechanical induction disc overcurrent relay is essential for understanding its operation. This type of relay utilizes electromagnetic principles to detect overcurrents and initiate a trip after a time delay, providing crucial protection for alternators and electrical distribution systems.
* **Components to be shown in the sketch:**

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