Cable classification problems

1. When Busbar Device Construction Is Completed, What Checks Should Be Carried Out?

Answer: The following checks should be carried out;

1. Metal components of the processing, preparation, welding screwing should align with the wire and cable
2. Each bolt, washers, cotter pins, and other parts should be complete and reliable.
3. Busbar configuration and installation frame should be in line with the provisions, phase, and ground electrical distance to meet the requirements.
4. Porcelain parts, iron parts, and glue joints should be complete. The oil-filled casing should be free of oil seepage and average oil level.
5. The paint is complete, the phase colour is correct, grounding is good.

1. 2. In The 35 KV And Below Power Cable Joints, Several Methods Are Used To Improve The Electric Field Distribution Of Its Sheath Disconnection. Please List Five And Briefly Describe Their Methods.

   Answer:

   1. Swell the horn: pry up the edge of the lead package and cut it off into a horn shape, the brink of which should be smooth, round, and symmetrical.
   2. Leave the tundish insulation: leave a section of tundish insulation paper between the lead pack cutout and the cable core separation point.
   3. Removal of semi-conducting paper: remove the semi-conducting paper below the flare.
   4. Wrapping stress cone: use insulating wrapping tape and conductive metal material wrapped into a cone to expand the shield to improve the electric field distribution artificially.
   5. Equipotential method: For dry-wrapped or cross-linked polyethylene cable heads, a section of the metal tape is wrapped around the insulating surface of each wire and cable core profile and joined together.
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