Single column vertical telescopic disconnector is developed by the domestic manufacturers based on the reference to the related foreign products in recent years. It has advanced design

reasonable structure

advantages of simple appearance

excellent performance

small footprint

long repair cycle. This type disconnector has an important role to meet the different needs of users. Some problems appeared during manufacturing such as the open angle of the moving contact is too small

the contact touching pressure is too big

the rolling wheel on the operating bar is easy to damage

and so on. This paper makes some investigations on the above issues

and some countermeasures are suggested for installation of such disconnector which may be helpful to designers.