Section 1 General Rules

Insulation of electrical installations. VL insulation

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

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1.9.10. The specific effective length of the creepage distance of the supporting garlands of insulators and pin insulators of overhead lines on metal and reinforced concrete supports, depending on C3 and rated voltage (at an altitude of up to 1000 m above sea level), should be taken from Table. 1.9.1.

The specific effective length of the creepage path of supporting garlands and pin insulators of overhead lines at an altitude of more than 1000 m above sea level should be increased compared to the normalized one in Table. 1.9.1:

• from 1000 to 2000 m - by 5%;
• from 2000 to 3000 m - by 10%;
• from 3000 to 4000 m - by 15%.

Table 1.9.1. Specific effective length of the creepage distance of supporting strings of insulators and pin insulators of overhead lines on metal and reinforced concrete supports, external insulation of electrical equipment and switchgear insulators

1.9.11. Insulating air distances from current-carrying to grounded parts of supports must comply with the requirements of Ch. 2.5.

1.9.12. The number of suspension disc insulators in the supporting garlands and in a series chain of garlands of a special design (V-shaped, -shaped, -shaped, -shaped, etc., composed of insulators of the same type) for overhead lines on metal and reinforced concrete supports should be determined by the formula

m = L / L and

where Li is the length of the creepage distance of one insulator according to the standard or specifications for an insulator of a particular type, see. If the calculation of m does not give an integer, then choose the next integer.

1.9.13. On overhead lines with a voltage of 6-20 kV with metal and reinforced concrete supports, the number of suspension disc insulators in supporting and tension garlands should be determined according to 1.9.12 and, regardless of the material of the supports, should be at least two.

On overhead lines with a voltage of 35-110 kV with metal, reinforced concrete and wooden poles with grounded fastenings of garlands, the number of dish-shaped insulators in tension garlands of all types in areas with the 1st-2nd C3 should be increased by one insulator in each garland compared to the number obtained by 1.9.12.

On overhead lines with a voltage of 150-750 kV on metal and reinforced concrete supports, the number of disc insulators in tension garlands should be determined according to 1.9.12.

1.9.14. On overhead lines with a voltage of 35-220 kV with wooden poles in areas with 1-2-th C3, the number of suspension plate insulators made of glass or porcelain can be taken 1 less than for overhead lines on metal or reinforced concrete poles.

On overhead lines with a voltage of 6-20 kV with wooden poles or wooden traverses on metal and reinforced concrete poles in areas with 1-2nd C3, the specific effective creepage distance of insulators must be at least 1,5 cm / kV.

1.9.15. In the garlands of supports of large transitions, one additional plate-shaped insulator made of glass or porcelain should be provided for every 10 m of the excess height of the support over 50 m in relation to the number of insulators of normal design, determined for single-circuit garlands at λe = 1,9 cm / kV for overhead lines with voltage 6-35 kV and λe = 1,4 cm / kV for overhead lines with a voltage of 110-750 kV. At the same time, the number of insulators in the garlands of these supports should not be less than that required by the pollution conditions in the crossing area.

1.9.16. In garlands of dish-shaped insulators made of glass or porcelain, suspended at a height of more than 100 m, two additional insulators must be provided in addition to that specified in accordance with 1.9.12 and 1.9.15.

1.9.17. The choice of insulation for overhead lines with insulated wires must be made in accordance with 1.9.10 - 1.9.16.

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

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