Overhead power lines with voltage up to 1 kV. Climatic conditions

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

Overhead power lines with voltage up to 1 kV. Climatic conditions

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

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2.4.11. Climatic conditions for the calculation of overhead lines up to 1 kV in normal mode should be taken as for overhead lines up to 20 kV in accordance with 2.5.38 - 2.5.74. In this case, for overhead lines up to 1 kV, the following should be taken:

when calculating according to 2.5.52: Cx= 1,1 - for SIP, free or covered with ice;

when calculating according to 2.5.54 and 2.5.55:

γnw = γng = 0,8 - for single-circuit overhead lines;

γnw = γng = 0,9 - for single-circuit overhead lines with suspension on PV supports;

γnw = 1,0 and γng = 1,2 - for double-circuit and multi-circuit overhead lines, as well as when hanging on the supports of overhead lines of a self-supporting non-metallic optical cable (OKSN);

γp = 1,0 and K1 = 1,0 - in all cases.

2.4.12. The calculation of the span length of the branch from the overhead line to the input according to 2.4.20 must be carried out in icy conditions for two cases:

1) wind direction at an angle of 90º to the axis of the overhead line, the wires of the overhead line are covered with ice be, the thickness of the ice wall on the branch wires b0 = 0,5 be;

2) wind direction along the overhead line (angle 0º), ice wall thickness on branch wires b0 = be.

In this case, in both cases, one should take into account the reduction in the tension of the branch wires when the top of the support is deflected.

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

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