External glass and porcelain insulation of electrical equipment and outdoor switchgear

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Section 1 General Rules

Insulation of electrical installations. External glass and porcelain insulation of electrical equipment and outdoor switchgear

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

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1.9.18. The specific effective length of the creepage distance of the external porcelain insulation of electrical equipment and insulators of outdoor switchgear with a voltage of 6-750 kV, as well as the outer part of the switchgear bushings, 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 leakage path of the external insulation of electrical equipment and insulators of outdoor switchgear with a voltage of 6-220 kV, located at a height of more than 1000 m, should be taken: at a height of up to 2000 m - according to Table. 1.9.1, and at an altitude of 2000 to 3000 m - one degree of pollution higher than normalized.

1.9.19. When choosing the insulation of the outdoor switchgear, the air insulation distances from the current-carrying parts of the outdoor switchgear to grounded structures must comply with the requirements of Ch. 4.2.

1.9.20. In the tension and supporting garlands of outdoor switchgear, the number of disc insulators should be determined according to 1.9.12 - 1.9.13 with the addition of one 110-150 kV garland, 220-330 kV two, 500 kV three, 750 kV four insulators to each circuit .

1.9.21. In the absence of electrical equipment that meets the requirements of Table. 1.9.1 for areas with 3-4th C3, it is necessary to use equipment, insulators and bushings for higher rated voltages with insulation that meets table. 1.9.1.

1.9.22. In areas with pollution conditions exceeding 4th C3, as a rule, the construction of a closed switchgear should be provided.

1.9.23. Outdoor switchgear with a voltage of 500-750 kV and, as a rule, outdoor switchgear with a voltage of 110-330 kV with a large number of connections should not be located in zones with the 3rd-4th C3.

1.9.24. The specific effective length of the creepage distance of the external insulation of electrical equipment and insulators in indoor switchgear with a voltage of 110 kV and above should be at least 1,2 cm/kV in areas with 1st C3 and at least 1,5 cm/kV in areas with 2-4- th C3.

1.9.25. In areas with 1-3rd C3, KRUN and KTP with insulation according to table should be used. 1.9.1. In areas with 4th C3, only KRUN and KTP with special insulators are allowed.

1.9.26. Insulators of flexible and rigid external open conductors must be selected with a specific effective creepage distance according to Table. 1.9.1: λe = 1,9 cm/kV for a rated voltage of 20 kV for current conductors of 10 kV in areas with 1-3rd C3; λe = 3,0 cm/kV for a rated voltage of 20 kV for conductors 10 kV in areas with 4th C3; λe = 2,0 cm / kV for a rated voltage of 35 kV for current conductors 13,8-24 kV in areas with 1-4th C3.

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

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