The working principle of the cable fault indicator is that when the line has a short-circuit fault, the short-circuit fault indicator senses the fault current, and the display window of the indicator will change from white to red (or glow).

According to 2# line B-phase indicator 2, 5, 8 and 3# line C-phase indicator 3, 6, 9 flop (or light) and 11, 12 indicators do not move, it can be quickly determined that the fault is point D. Indicator reset time has 6, 12, 24, 48 hours optional action criteria.

working principle

(1) It≥100A It is the starting value of the sudden change current;

(2) △I≥0.5I0 △I is the current change rate and I0 is the line current before the short circuit;

(3) I=0 I is the current after the line fault;

(4) 0.06S≤△T≥3S △T is the current mutation time.

The scope of application editing is applied to cable systems such as 6-35KV distribution boxes, ring network cabinets, and box transformers.

  installation method

initial state;

Step 2: Separate the shell from the metal parts;

Step 3: Unscrew the screw;

Step 4: Clip the metal piece on the cable;

Step 5: Snap the shell and metal parts together;

Step 6: Tighten the screw to fix the indicator on the cable. Detection principle Short-circuit detection: Detect the current of the cable line, set a threshold value, over the set value and reach the specified delay, the action will turn over, indicating which phase has a short-circuit fault.

Grounding detection: Detect the zero-sequence current of the cable line, set a threshold value, and after the set value exceeds the set value and reaches the specified delay, the action will be flipped, indicating which phase has ground fault.

Step 1: Original