The cable fault indicator is composed of a sensor and a display. The sensor is responsible for detecting the current passing through the cable, and the display is responsible for judging the current information sent by the sensor and making fault indication actions.
Under normal conditions, the fault indicator does not work, and the fault indicator does not light up. When the current through the cable reaches the fault current value set by the fault indicator, the display will judge the current from the sensor. If the overcurrent lasts for less than 100-200 ms, the current may be caused by factors such as motor starting. The instantaneous start-up overcurrent is not a fault current, so the display does not operate. If the overcurrent continues for more than 100-200 ms, it is judged as a fault current, the display acts, and the indicator light flashes. Make another judgment after the display moves. If the cable current has returned to normal within 2 s, it means that the upper switch has successfully reclosed, the fault has been eliminated, and the normal power supply state is restored. The display returns to the initial state, and the indicator light goes out. If the cable current disappears within 2 s, it means that the fault has caused the upper switch to trip and the cable loses voltage. It is determined to be a fault, the display keeps operating, and the indicator light continues to flash until the preset time limit is reached or it is manually reset.
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