Communication repair reports during thunderstorms all seem to have the same result: the port is broken. putOptical isolation renovation of a 220kV substation communication networkRepair orders from the two rainy seasons were reclassified according to the phenomenon. Three types of inducements can be distinguished, and the solutions are very different.

First, distinguish whether the fault is the signal port or the power port.

Damage to the power port is often accompanied by the action of the lightning protection unit or the blown fuse. In the records, the entire cabinet of equipment often loses power at the same time. Damage to the signal port only shows that a certain channel is offline, and the power supply to the equipment is normal. This step divides the subsequent investigation direction into two branches, and there is no need to push all repair reports to the same surge protector. When making judgments, check whether multiple channels fail at the same time. The failure of a single channel often points to the line itself.

The lower lead section and the overhead section are high-frequency accident points

The strong electromagnetic field near the lightning strike point induces overvoltage in the overhead and down-conducting sections, and enters the cabinet along the metal components and armor layer. There are three common omissions at the scene:

• The lower lead section uses ordinary jumpers and does not adopt an armored structure;
• The grounding of the armor layer is only connected on the cabinet side, and no reliable equipotential treatment is performed before entering the cabinet;
• The cable entry hole is not blocked, and moisture condensation creeps into the terminal along the cable.

The section leading down and entering the cabinet is reused.Single mode double core armored patch cordAnd leaving a good length according to the interval is the most common rectification action for this type of repair report.

Rectification sequence: isolation first, then protection, then grounding review

First evaluate whether the channel can be replaced with optical media to completely disconnect the intrusion path; then complete the mechanical and waterproof protection of the outdoor section; and finally review the grounding connection and shielding treatment methods to prevent both ends from being grounded at the same time to form a loop. The order of the three is reversed, and it often recurs after the correction is completed. Related practices can be comparedCommunication transformation plan for electric power and new energy stationsIn the outdoor scene section, Wolflight also provides segmented fault diagnosis support based on repair reports.

After the rainy season, it is recommended to recheck the receiving optical power, compare it with the records retained during the transformation, and write the margin changes into the ledger.