Steel Hose Fittings Manufacturers introduced that there will be many problems in the production of waterproof fittings. First, summarize a few suggestions on the production requirements:
1. To make cable terminals and connectors, continue to operate from the beginning of the cable stripping to completion, and shorten the insulation exposure time as much as possible. Do not damage the core and the remaining insulation when stripping the cable. The wrapping, assembly, and heat shrinking of the additional insulation should be clean.
2. When the oil-filled cable line has a joint, the joint should be made first; when there is a position difference between the two ends, the low-position terminal should be made first.
3. Effective measures such as reinforced insulation, sealing and moisture-proofing, and mechanical protection should be adopted for cable terminals and joints. The terminals and joints of 6kV and above power cables should have effective measures to improve the electric field concentration at the shielded ends of the cable, and the distance between the external insulation phases and the ground should be ensured.
4. When stripping the core insulation, shielding and metal sheath of cables of 35kV and below, the minimum distance from the core along the insulation surface to the nearest grounding point (the end of the shield or metal sheath) shall meet the requirements of Table 6.2.4.
5. When making terminal heads and connectors for plastic insulated cables, the semi-conductive shielding layer must be completely removed. For the coated graphite shielding layer, solvent should be used to wipe off the carbon traces; for the extruded shielding layer, the insulating surface should not be damaged when stripping off, and the shielding end should be flat.
6. The insulated cable should keep 25mm of overall insulation, and don't damage it. Peel off the shielding carbon ink paper, and the ends should be flat. When bending the core, use even force and do not damage the insulating paper; the bending radius of the core should not be less than 10 times its diameter. When wrapping, pouring, or filling with insulating materials, the air gap at the branch of the core should be eliminated.
7. When the oil-filled cable terminal and joint are wrapped with additional insulation, the pressure tank cannot be completely closed. During the production of neutralization and vacuum treatment, the oil seeping from the cable should be discharged in time, and it should not accumulate in the porcelain sleeve or the shell.
8. When the cable core is connected, the oil stain and oxide layer of the core and the inner wall of the connecting pipe should be removed. The crimping dies and fittings must be properly matched. The compression ratio must meet the requirements. After crimping, repair the convex marks on the terminal or connecting pipe smoothly without leaving any burrs. To connect the copper core by soldering, a neutral solder paste should be used, and the insulation should not be burnt.
