These units are employed as grit arrester on small cupola.

这种装置在小型冲天炉中是作为砂粒分离器使用的。

At present, the most commonly used are zinc oxide arrester.

目前，使用最多的是氧化锌避雷器。

Oxidation will make ground-wire of lightning arrester rusty.

氧化（作用）会使避雷装置的接地线生锈。

In such a case the arrester rating could be substantially lower.

在这种情况，避雷器额定值可明显低些。

This means that arrester rating is 100% of the system line-to-line voltage.

这表明避雷器的额定值为系统线电压的100％。