Connections and cable terminations

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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. Connections and cable terminations

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

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2.3.65. When connecting and terminating power cables, coupling designs should be used that correspond to their operating conditions and the environment. Connections and terminations on cable lines must be made so that the cables are protected from the penetration of moisture and other harmful substances from the environment into them and that the connections and terminations withstand the test voltages for the cable line and comply with the requirements of GOST.

2.3.66. For cable lines up to 35 kV, terminations and couplings must be used in accordance with the current technical documentation for couplings approved in the prescribed manner.

2.3.67. For connecting and locking sleeves of oil-filled low-pressure cable lines, only brass or copper sleeves must be used.

The length of the sections and the location of the stop sleeves on the low-pressure oil-filled cable lines are determined taking into account the replenishment of the lines with oil in normal and transient thermal conditions.

Locking and semi-locking couplings on cable oil-filled lines must be placed in cable wells; when laying cables in the ground, it is recommended to place couplings in chambers that are subject to subsequent backfilling with sifted earth or sand.

In areas with electrified transport (metro, trams, railways) or with soils that are aggressive towards metal sheaths and cable line couplings, couplings must be accessible for control.

2.3.68. On cable lines made by cables with normally impregnated paper insulation and cables impregnated with non-draining mass, cable connections should be made using stop-and-go couplings if the level of laying cables with normally impregnated insulation is higher than the level of laying cables impregnated with non-draining mass (see also 2.3.51 .XNUMX).

2.3.69. On cable lines above 1 kV, carried out by flexible cables with rubber insulation in a rubber hose, cable connections must be made by hot vulcanization coated with anti-damp varnish.

2.3.70. The number of couplings per 1 km of newly constructed cable lines should be no more than: for three-core cables 1-10 kV with a cross section of up to 3 x 95 mm2 4 pcs.; for three-core cables 1-10 kV with sections 3 x 120 - 3 x 240 mm2 5 pcs.; for three-phase cables 20-35 kV 6 pcs.; for single-core cables 2 pcs.

For cable lines 110-220 kV, the number of couplings is determined by the project.

The use of small-sized cable segments for the construction of extended cable lines is not allowed.

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

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