What is creepage in electrical?
CREEPAGE: The shortest path between two conductive parts, or between a conductive part and the bounding surface of the equipment, measured along the surface of the insulation (Figure 2).
What is creepage current?
Creepage is defined as the shortest distance between two conductive paths measured along the surface of a solid insulation. Minimum creepage and clearance distances are defined by the IEC standards bodies as guidance intended to prevent air arcing during operation.
Why is creepage distance important?
The isolation required between parts with different operating voltages, to prevent against unacceptable risk, is the primary reason for the importance of creepage and clearance distances. It [creepage] is the shortest distance between two conductive parts, measured through air.
What is creepage insulator?
The creepage distance for insulators is the shortest distance along the insulator surface between the metal parts at each end of the insulator. Creepage distance can also be refer as leakage distance for insulators.
What is creepage factor?
Creepage Factor (CF), is a global check of the overall density of creepage distance and is equal to l/A where: l is the total creepage distance of the insulator and A is the arcing distance of the insulator. For disc insulators the CF is determined for a string comprising at least 5 insulator units.
What is pollution degree?
Pollution degree is a classification according to the amount of dry pollution and condensation present in the environment. This classification is important since it affects creepage and clearance distances required to ensure the safety of a product. Temporary conductivity caused by condensation is to be expected.
What is creepage test?
Creepage & Clearance distances form part of the product’s electrical insulation system that protects the user from a Risk of Shock. Purpose of the Test: To verify that there is adequate insulation between electrical parts, to withstand the rigors of normal use, over the life of the product.
What is bushing creepage?
distance. Minimum nominal creepage distance is the shortest distance along the surface of an insulator between two conductive parts. In the case of bushings, this is the distance between the bushing top metallic dome/terminal and the flange, which is referred to in terms of mm/kV, Fig.