10KV cable terminal steel armour grounding method

Abstract

The invention discloses a 10KV cable terminal steel armour grounding method. The method is characterized by, on one hand, carrying out coarse sand grinding processing on a steel armour layer for fixing a copper pigtail grounding wire, and tightly winding two loops of copper nets outside the steel armour layer obtained after grinding processing; on the other hand, carrying out unique processing on the copper pigtail grounding wire itself, setting an S-shaped seepage-proofing section and carrying out solder solidification processing on the seepage-proofing section to stop water molecules in the air from penetrating inside along the copper pigtail nets gradually; and besides, wrapping sealant on the junction of the exposed steel armour layer and the rest outer sheath layer, the outer sheath layer under the seepage-proofing section and the outer side of the seepage-proofing section of the copper pigtail grounding wire. The method has the advantages of being reasonable to operate, firm in fixation, good in seepage-proofing performance and safe and reliable, and can greatly prolong the service life of a high-voltage cable and the service life of the copper pigtail grounding wire.

Description

Technical field [0001] The invention relates to a grounding method, in particular to a 10KV cable terminal head steel armor grounding method. Background technique [0002] In electric power construction, because the 10KV high voltage cable has only three cores and no neutral wire, it will induce current due to the three-phase imbalance during operation. Therefore, when the 10KV high voltage cable terminal is grounded, the steel armor layer will be Fix a ground wire externally to allow induced current to pass into the earth through the ground wire. At present, when grounding the steel armor of the 10KV high-voltage cable terminal head, it is often the first choice to use copper stranded wire or copper braided wire as the copper braid grounding wire of the intermediate conductor section, and then directly pass one end of the copper braid grounding wire through constant force The spring is fixed outside the steel armor layer of the 10KV high-voltage cable terminal head, and the mid...

AI Technical Summary

Problems solved by technology

At present, when grounding the steel armor of the 10KV high-voltage cable terminal head, it is often first to choose a copper braided grounding wire with a copper stranded wire or a copper braided wire as the intermediate conductor segment, and then directly pass one end of the copper braided grounding wire through a constant force. The spring is fixed outside the steel armor layer of the 10KV high-voltage cable terminal, and the intermediate conductor section of the copper braided grounding wire is arranged in a straight line. This grounding method not only makes the copper braided grounding wire unfixed, but also causes The middle conductor section of the cable is a whole straight line of copper braided mesh, which is soft in texture. Moreover, the outdoor terminal of the high-voltage cable is exposed to the air for a long time. After a long time of use, the water molecules in the air will slowly The copper braid net penetrates in, and finally reaches the copper shielding layer and semi-conductive layer of the high-voltage cable, which not only leaves hidden dangers to the safe operation of the high-voltage cable, but also greatly reduces the service life of the high-voltage cable and the service life of the copper braided grounding wire itself