What does selectivity in protection design aim to achieve?

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Prepare for the 3rd Year Electrical Trades Qualification (TQ) exam. Use flashcards and multiple choice questions to master the material. Each question comes with hints and explanations to help you succeed. Get set for your qualification!

Multiple Choice

What does selectivity in protection design aim to achieve?

Explanation:
Selectivity in protection design means isolating the fault by tripping only the smallest portion of the system necessary to clear it, so the rest of the network keeps power on. This is achieved by coordinating protective devices so the device closest to the fault operates first, and upstream devices only operate if the fault isn’t cleared downstream. Tripping the largest portion would unnecessarily cut power to a bigger area and defeat the purpose of selective protection. And options that imply never tripping or tripping randomly don’t provide reliable fault clearance or maintain system reliability.

Selectivity in protection design means isolating the fault by tripping only the smallest portion of the system necessary to clear it, so the rest of the network keeps power on. This is achieved by coordinating protective devices so the device closest to the fault operates first, and upstream devices only operate if the fault isn’t cleared downstream. Tripping the largest portion would unnecessarily cut power to a bigger area and defeat the purpose of selective protection. And options that imply never tripping or tripping randomly don’t provide reliable fault clearance or maintain system reliability.

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