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Pollution level and creepage distance for station post insulator

The pollution performance and creepage distance is important for station post insulator used in contamination environments according to IEC 60273.

Pollution level and creepage distance for station post insulator   Pollution level and creepage distance for station post insulator

In standard IEC60273, creepage distances are standardized for post insulators in class I and II, which is not in accordance with the general recommendations of the guide IEC60815 “Guide for the selection of insulators in respect to environmental conditions”.

In IEC60815 the basic pollution levels are defined qualitatively with examples of typical environmental situations. The corresponding minimum nominal creepage distance is given in mm/kV.

How to design the creepage distance for station post insulator?
◆ Level 1
Used in light pollution areas
The specific creepage distance: 16mm/kV; 0.630inch/kV
Areas without industry and with low housing density equipped with heating plants.
Areas with low density of industry or houses but subjected to frequent winds and/or rainfall
Agricultural areas
Mountainous areas

◆ Level 2
Used in medium pollution areas
The specific creepage distance: 20mm/kV; 0.787inch/kV
Industrial areas not producing particulate polluting smoke and/or with average housing density equipped with heating plants
Areas with high density of houses and/or industry but subjected to frequent winds and/or rainfall
Areas exposed to wind from the sea but not too close to the coast (at least several kilometers distant)

◆ Level 3
Used in light pollution areas
The specific creepage distance: 25mm/kV; 0.984inch/kV
Areas with high density of industries and suburbs of large cities with high density of heating plants producing pollution
Areas close to the sea in any case exposed to relatively strong winds from the sea

◆ Level 4
Used in very heavy pollution areas
The specific creepage distance: 31mm/kV; 1.220inch/kV
Areas generally of moderate extent, subjected to conductive dusts and to industrial smoke producing particularly thick conductive deposits.
Areas generally of moderate extent, very close to the coast and exposed to sea-spray or to very strong and polluting winds from the sea.
Desert areas, characterized by no rain for long periods, exposed to strong winds carrying sand and salt, and subjected to regular condensation

The creepage distance should be increased in relation to the average diameter. Dm
Dm < 300mm, kd=1.0
Dm 300 – 500 mm, kd=1.1
Dm > 500mm, kd=1.2

 

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