目前,输油泵站 6 kV配电装置中使用的开关,大多数是国产 SN系列的少油开关。这种开关从50年代生产以来,曾经做过几次有多厂参加的改进性联合设计,对开关的断流容量、排气方式、本体结构等做了一些改进。由于开关基本型式的局限,该产品仍然存在渗漏油、机构辅助接点转换不良、铜 At present, most of the switches used in the 6 kV power distribution unit of the transmission pump station are less oil switches of the domestic SN series. Since the switch was started in the 1950s, the company has made several improvements in joint design with multiple plants participating in the project. Some improvements have been made in the switch-off capacity, the exhaust mode and the structure of the main body. Due to the limitations of the basic switch type, the product still exists leakage oil, poor auxiliary switch agencies, copper