Freedom from pores test system for plastic layer, paint on electric conducting base

摘要

The test system includes a spark gap (6,9), which is connected parallel to a specimen under test for adjusting the test voltage, and its spark length is variable, for adjusting the desired level of voltage. The spark gap is arranged in a hard paper or plastic tube (8). The tube is surrounded by a first metal tube (15) consisting of a good conducting material, which in turn is surrounded by a first metal tube consisting of a good conducting material, which in turn is surrounded by a second metal tube (16) made of a material with a higher initial permeability. The first metal tube is manufactured from a material with high electrical conductivity e.g. copper. The first metal tube is arranged directly on the outer surface of the hard paper or plastic tube. The second metal tube is manufactured from Mumetal, Vakoperm (RTM) or similar.