Surge arrestor is the basis of insulation co-ordination for power equipment. It is
used for limiting over voltage.
Medium voltage polymeric surge arrestor has an advanced envelope system for the
ZnO varistor stack. This new system improves resistance to weather conditions
(no moisture ingression) and mechanical characteristics. Such structure offers
high cantilever and torsion strength. Covered with polymeric (silicone rubber)
housing over this envelope, such housing is highly resistant to UV radiation,
polluted and all weather conditions. Such surge arrestor is specially
recommended for high polluted areas. Disconnector can supplier with surge
arrestor, which is coordinated with the over current protection of the
distribution lines.
Surge arrestor consists of 5KA type which are used on network with a moderate
lightning exposure, and 10KA type which are used on network with a strong
lightning exposure. Applicable to environment of ambient temperature range of
+40 to -40 centigrade, power frequency range of 48~62 Hz, utmost wind velocity
no higher than 35m/s.
Distribution surge arrestor meets IEC 60099-4 standard.