The insulating spacer is the core component in gas insulated metal enclosed switchgear (GIS). For reducing the size of the equipment and the usage of SF

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gas in the context of guaranteeing good dielectric strength

the insulating spacer for GIS in real project is taken as the research object

the design of the compact insulating spacer is developed based on the surface electric filed optimization and the influence of the tilt angle at the cent

ral conductor of the spacer

the distance from the root of the high voltage shield electrode to the central conductor of the spacer and the angle of the side wall of the spacer on the tangential field strength is mainly studied. The simulation results show that the tangential electric field strength of concave and convex sides of the compact insulating spacer presents a single and double peak structure variation

and the maximum tangential electric field strength of convex side increases significantly

and the overall maximum tangential electric field strength decreases by 5.5%. When the tilt angle of the central conductor is 6°-8°

the maximum tangential field strength on the concave side reaches a minimum. It is found through the negative lightning impulse assessment and margin test on the compact insulating spacer designed in this paper that the insulation margin increases instead of decrease and is up to 1.35 times

which provides a reference for the engineering promotion of compact insulating spacer.