Question 318Electricity/Electronics - Assistant Engineer70% to pass
As shown in figure "A" of the illustration, what type of ground fault detection system is illustrated? Illustration EL-0132
AI Explanation
The correct answer is C) a direct current injection system.
The illustration EL-0132 shows a direct current injection system for ground fault detection. This system works by injecting a small direct current between the system neutral and ground, allowing for the detection of any ground faults in the electrical system.
The other options are incorrect because:
A) A neutral to ground current transformer system detects ground faults by monitoring the current flow between the neutral and ground, which is different from a direct current injection system.
B) A core-balance current transformer system detects ground faults by monitoring the balance of currents in the phases, rather than using a direct current injection method.
D) A set of ground detection lamps system visually indicates the presence of a ground fault, but does not use a direct current injection approach.
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