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- Q684 - Electrical, Electronic, & Control Engineering
168. Which of the following illustrated circuit schematics provides phase failure protection for a three phase motor using load side current sensing technology
Choice D is correct; it utilizes current transformers on the motor load leads, enabling the phase failure relay to sense load-side current rather than line voltage. Options A, B, and C directly connect the relay to line conductors, providing voltage-based phase failure detection, which does not meet the specified requirement for load-side current sensing.
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