1. Operation sequence of power failure:
1) When the drop-open fuses are arranged horizontally and there is wind, the power outage operation should be carried out against the wind direction. First open the leeward side drop-out fuse, then pull out the middle-phase drop-out fuse, and finally pull out the upper-wind side. Drop-out fuse. When the drop-out fuses are arranged horizontally and there is no wind, the middle-phase drop-out fuse should be opened first, and then the left and right side-phase drop-out fuses should be opened.
2) When the drop fuses are arranged in a triangle and there is wind, the power outage operation should first open the leeward side drop fuse, then pull open the upper wind side drop fuse, and finally pull open the middle phase drop fuse. When the drop fuses are arranged in a triangle and there is no wind, the power outage operation first pulls open the left and right phase drop fuses, and then pulls open the middle phase drop fuse.
2. Sequence of power transmission operations: No matter whether the drop fuses are arranged in a triangle or horizontally, the power transmission operation should first close the middle phase drop fuse, and then close the drop fuses on both sides.
3. Use the drop fuse to stop and send branch lines and transformer operation sequence:
1) Shutdown of distribution transformers. First, open the air circuit breaker or low-voltage fuse on the low-voltage side of the transformer, stop the low-voltage load of the distribution transformer, and then open the drop-out fuse on the high-voltage side of the distribution transformer.
2) The distribution transformer is put into operation. First close the drop-out fuse on the high-voltage side of the distribution transformer, and then close the air circuit breaker or low-voltage fuse on the low-voltage side of the transformer.
3) The drop-out fuse of the branch line is out of service. The operator shall operate according to the outage operation sequence of a single distribution transformer, outage the distribution transformers on the branch line one by one, and finally open the drop fuse that controls the branch line and remove the fuse tube. The power delivery procedure is the opposite.
