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K-value design is a method to improve traditional creepage distance.
In its full extent, K-value design is a method to reduce weight,
volume and space while improving properties in-service by increasing
pollution performance and equalizing the electrical field.
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K-value is the unit for insulator shape and IEC 60507 defines the formula
as form factor |
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 | Form factor used as a design method is referred to as K-value
and can be used for different types of improvements. |
| Creepage distance considers a leakage current as traveling
along the insulator, in a strict line, identifying only distance. |
| K-value considers a leakage current as traveling along the insulator,
over its complete surface. It calculates reduced diameter and/or
increased creepage distance for higher resistance against the leakage
currents. K-value identifies an insulator’s total shape, i.e., geometric
(ohmic) resistance against leakage currents. |
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The shape of the insulator must be calculated for optimum design of
pollution performance. The traditional calculation of creepage distance is
sometimes sufficient, but to achieve best performance in relation to
material and space used, K-value design is necessary.
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PPC Insulators offers complete computer design of K-value, integrated with
electrical, mechanical, dimension and material calculations. |
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