目前,国产电力机车受电弓所用的支持绝缘子有两种——2220型和2220—E型,其外形图见图1。2220型自五十年代末制成以来,经多年装车运用,反映其耐污秽能力较差,易电晕和闪络。为提高其耐污能力,工厂在1979——1980年进行了加大泄漏距离的尝试,由醴陵电瓷厂试制了2220—E型绝缘子。2220—E型绝缘子较原2220型在电气强度方面有所改善,但在现场运用过程中还存 At present, there are two kinds of supporting insulators for domestic electric locomotive pantograph-type 2220 and type 2220-E. The outline drawing is shown in Figure 1.2220 type has been used for many years since loading and unloading since the late 1950’s, Its poor resistance to contamination, easy to corona and flashover. In order to improve its anti-fouling capacity, the factory conducted an attempt to increase the leakage distance from 1979 to 1980, and the 2220-E type insulator was trial-produced by Liling Electric Porcelain Factory. 2220-E-type insulator than the original 2220-type electrical strength has improved, but still stored in the field process