摘要:
The present invention relates to a varistor material for a surge arrester with target switching field strength ranging from 250 to 400 V/mm comprising ZnO forming a ZnO phase and Bi expressed as Bi2O3 forming an intergranular bismuth oxide phase, said varistor material further comprising a spinel phase, characterized in that the amount of a pyrochlore phase comprised in the varistor material is such, that the ratio of the pyrochlore phase to the spinel phase is less than 0.15:1.
摘要:
Exemplary embodiments are directed to a power electronic device with an electronic device including a substrate, a metal layer formed on the substrate and a field grading means located along an edge of the metal layer. The field grading means has a non-linear electrical resistivity.