In the power transmission , especially in modern super high voltage and high voltage power transmission process , the security is often a very important issue . It plays an important role in the power transmission cables which security demands? Power cable companies who generally have the following five points.
1 cable cross each other , the high-voltage cables should be below the low-voltage cables . If one of the cables around the crossing point within the range of 1m or wear protective tube separated by a partition , the minimum allowable distance of 0.25m.
2 cables with heat pipe close to or intersect , if insulation measures , a minimum distance of parallel and intersecting 0.5m respectively and 0.25m.
3 cable railway or road intersection should wear protective tube to protect the pipe should extend beyond 2m rail or road .
4 cables from the building foundation should be able to ensure that the cable is buried outside the building bulk water ; cable into the building should wear protective tube , the tube should be beyond the protection of bulk water outside the building .
5 should distance between the ground directly buried cables and grounding devices generally 0.25 ~ 0.5m; direct buried cable burial depth , generally not less than 0.7m, and should be buried in the permafrost .
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