Author/Authors :
Hama، نويسنده , , M.، نويسنده , , Ishizaka، نويسنده , , H.، نويسنده , , Shimizu، نويسنده , , J.، نويسنده , , Nishiki، نويسنده , , S.، نويسنده , , Kaku، نويسنده , , I.، نويسنده ,
Abstract :
New zinc–oxide elements with a varistor voltage
about twice that of conventional ones have been developed by
reducing the ZnO grain size with a new additive, which enables to
halve the series number of elements in metal oxide surge arrester.
Using these elements, we have developed advanced built-in surge
arresters enclosed in 6.6 kV pole transformers and switchgear.
The advanced arresters have been reduced in volume by 25%
compared with conventional ones.
This paper describes the specification and construction of the
advanced arresters and the results of various evaluation tests.
Keywords :
pole switchgear , zinc–oxide elements. , poletransformer , Metal oxide surge arrester
