Cable lines up to 220 kV. grounding

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Section 2. Sewerage of electricity

Cable lines up to 220 kV. grounding

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Encyclopedia of radio electronics and electrical engineering / Rules for the installation of electrical installations (PUE)

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2.3.71. Cables with metal sheaths or armor, as well as cable structures on which cables are laid, must be grounded or grounded in accordance with the requirements given in Ch. 1.7.

2.3.72. When grounding or grounding the metal sheaths of power cables, the sheath and armor must be connected by a flexible copper wire to each other and to the housings of the couplings (terminal, connecting, etc.). On cables of 6 kV and above with aluminum sheaths, the sheath and armor grounding must be carried out by separate conductors.

It is not required to use grounding or neutral protective conductors with a conductivity greater than the conductivity of the cable sheaths, however, the cross section in all cases must be at least 6 mm2.

Cross-sections of grounding conductors of control cables should be selected in accordance with the requirements of 1.7.76 - 1.7.78.

If an external end sleeve and a set of arresters are installed on the structure support, then the armor, metal sheath and sleeve must be connected to the grounding device of the arresters. The use of only metal sheaths of cables as a grounding device in this case is not allowed.

Overpasses and galleries must be equipped with lightning protection in accordance with RD 34.21.122-87 "Instruction for the installation of lightning protection for buildings and structures" of the USSR Ministry of Energy.

2.3.73. On cable oil-filled low-pressure lines, end, connecting and locking couplings are grounded.

On cables with aluminum sheaths, feeders must be connected to the lines through insulating inserts, and the end sleeve housings must be insulated from the aluminum sheaths of the cables. This requirement does not apply to cable lines with direct entry into transformers.

When using armored cables for oil-filled low-pressure cable lines in each well, the cable armor on both sides of the coupling must be welded and grounded.

2.3.74. The steel pipeline of high-pressure oil-filled cable lines laid in the ground must be grounded in all wells and at the ends, and those laid in cable structures - at the ends and at intermediate points determined by the calculations in the project.

If it is necessary to actively protect the steel pipeline from corrosion, its grounding is carried out in accordance with the requirements of this protection, while it must be possible to control the electrical resistance of the anti-corrosion coating.

2.3.75. When a cable line passes into an overhead line (VL) and if there is no grounding device at the overhead line support, cable boxes (masts) can be grounded by attaching the metal sheath of the cable if the cable box at the other end of the cable is connected to the grounding device or the grounding resistance of the cable sheath meets the requirements of Ch. 1.7.

See other articles Section Rules for the installation of electrical installations (PUE).

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