我国目前需要大量的管型避雷器,若全部需向国外提出订货,不仅不经济,而且在时间上和数量上亦实难满足我电力系统急迫的需要。因此我局便与橡胶四厂签订了试制管型避雷器之合同。 试刷成品之型号为DF-35/0.2-2和DF-35/0.5-8。其主要尺寸内径分别为5及7.5公厘,内部火花间隙为170及140公厘。 At present, China needs a large number of lightning arresters. If all of them need to be placed abroad, it is not only uneconomical, but also difficult to meet the urgent needs of our power system in terms of time and quantity. Therefore, the Bureau signed a contract for trial-manufacture of a tubular arrester with the Fourth Rubber Factory. The model number of the finished brush is DF-35/0.2-2 and DF-35/0.5-8. Its main dimensions are 5 and 7.5 mm, respectively, and internal spark gaps are 170 and 140 mm.