Insulation of electrical installations. Application area. Definitions

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Section 1 General Rules

Insulation of electrical installations. Application area. Definitions

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

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1.9.1. This chapter applies to the choice of insulation for AC electrical installations for a rated voltage of 6-750 kV.

1.9.2. The length of the creepage distance of the insulation (insulator) or composite insulating structure (L) is the smallest distance along the surface of the insulating part between metal parts of different potential.

1.9.3. Effective creepage distance - part of the creepage distance that determines the dielectric strength of an insulator or insulating structure under conditions of pollution and moisture.

Specific effective creepage distance (λe) - the ratio of the effective creepage distance to the highest operating phase-to-phase voltage of the network in which the electrical installation operates.

1.9.4. Creepage distance utilization factor (k) is a correction factor that takes into account the effective use of the creepage distance of an insulator or insulating structure.

1.9.5. Pollution degree (C3) - an indicator that takes into account the impact of atmospheric pollution on the decrease in the electrical strength of the insulation of electrical installations.

1.9.6. Pollution Degree Map (КC3) - a geographical map zoning the territory according to C3.

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

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