BREAKING RESISTANT HIGH-VOLTAGE METAL OXIDE SURGE ARRESTERS WITH COMPOSITE HOUSINGS

摘要

The application of composite housings for arresters made of a FRP tube for mechanical strength and SIR sheds for weather protection is advantageous in many respects: The excellent pollution performance, which is caused by the transfer of hydrophobicity from the silicone bulk material to the pollution layer and which is even effective after many years of service, has experimentally been verified in many investigations up to now and is generally acknowledged today. The withstand salinity of the described arrester is at least 80 g/l at specific creepage distances below 20 mm/kV. More important, however, is the high mechanical strength of the composite housing. The rated cantilever strength of the described arrester is the same as for a post insulator of the same voltage rating. This value is even guaranteed after pressure relief. Therefore, post insulators beside the arrester can be omitted in many applications without any loss of safety for the equipment. Endangering of staff or equipment by parts scattering during pressure relief can be excluded. Thus the described arrester offers reduced expense of installation and a maximum safety even in case of possible overloading.