Line fault indicator EKL-4DXN with live comprehensive fault indication, designed for ground panel type high-voltage switchgear, featuring lockout function.

Main functions:
1. Short-circuit sensor issues an alarm signal, which is transmitted via optical fiber to the main unit. Upon receiving this signal, the main unit generates a corresponding alarm indication signal for short-circuit faults.
2. Grounding alarm indication: The grounding sensor detects the zero-sequence current of the line during operation. When the grounding fault current reaches or exceeds the set alarm current value, the grounding sensor issues an alarm signal, which is transmitted via optical fiber to the main unit. Upon receiving this signal, the main unit generates a corresponding alarm indication signal.
3. High-voltage energized indication: The indicator continuously monitors the energized status of high-voltage lines, displaying the status through high-brightness LED flashing on the main unit's front panel corresponding to "12L3 phase". This method overcomes the drawback of traditional energized indicators having low brightness. The LED flash frequency can roughly distinguish the voltage level or changes in line voltage. The working power source of the LED is derived from the high-voltage electric field, not using the main unit's battery, thus significantly improving the accuracy and lifespan of the energized indication.
4. High-voltage phase verification: Through the high-voltage phase verification function on the main unit's front panel, it tests and verifies the accuracy of high-voltage energized input signals and high-voltage fault indications, thereby distinguishing and confirming the high-voltage phases.
5. Low-voltage alarm indication: The main unit uses battery power. When the battery voltage is below the normal operating voltage, a low voltage alarm indication signal is generated to remind staff to replace the battery, ensuring timely and accurate reflection of high-voltage line fault conditions.
6. Automatic reset: After the indicator issues an alarm signal, if no manual reset is performed, the indicator will automatically reset after the set time. The reset time has 5 selectable settings (8 seconds, 12 hours, 24 hours, 48 hours, default reset time is 12 hours).
7. Manual reset: After the indicator issues an alarm, the alarm can be cleared by pressing the "reset/test" button on the main unit's front panel.
8. Remote reset: After the indicator generates an alarm signal, it can transmit the alarm signal remotely. The indicator can also accept remote reset signals to perform remote reset operations.
9. Automatic test: By pressing the reset/test button on the main unit's front panel, the L1, L2, L3, L4 indicators flash internally 9 times before automatically resetting. Manual reset is also possible. The self-test occurs twice (with a recommended duration of 2-5 seconds).