Question 318Electricity & Electronics - Assistant Engineer

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.