In the Company's reclosure system, which protection type is used?

• A. Time-over current
• B. Overvoltage
• C. Undervoltage
• D. Ground fault

Answer: (A)

Time-over current is used because a recloser reacts to faults by measuring current levels and applying a deliberate time delay before tripping and then attempting to reclose. When a fault hits the line, current spikes; the recloser waits a short interval on the overcurrent condition, trips to open the circuit, and then tries a reclosing sequence after a short rest. If the fault is temporary, the current falls and service is restored; if the fault persists, it trips again later.

Overvoltage, undervoltage, and ground fault protections are not the primary mechanism for reclosing. Voltage-based protections respond to abnormal voltage levels rather than fault current, and ground fault protection detects leakage paths rather than the typical fault current pattern used to decide on reclosing.