GROUND DETECTORS
DC Ground detectors are the devices that are used to detect/indicate the ground fault for ungrounded DC systems. When a ground fault occurs in such a system, immediate steps should be taken to clear it. If this is not done and a second ground fault happens, a short circuit occurs. Lamps are generally used for the detection of ground faults. They are connected for an ungrounded 2-wire system as shown in Figure. Each lamp should have a voltage rating equal to the line voltage. The two lamps in series, being subjected to half their rated voltage, will glow dimly. If a ground fault occurs on either wire, the lamp connected to the grounded wire will not glow while the other lamp will glow brightly.
AC Ground detectors: are the devices that are used to detect the ground fault for ungrounded AC systems. When a ground fault occurs in such a system, immediate steps should be taken to clear it. If this is not done and a second ground fault happens, a short circuit occurs. The figure shows how lamps are connected to an ungrounded 3-phase system for the detection of a ground fault. If a ground fault occurs on any wire, the lamp connected to that wire will be dim and the lamps connected to the healthy (ungrounded) wire will become brighter.
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