The mechanical characteristic of 252 kV three-phase enclosed insulating spacer is studied through hydrostatic test and analysis

and the stress distribution and weak position of the three-phase enclosed insulating spacer are obtained. The stress distribution and variation of the insulating spacer are obtained by real-time measurement of the strain in the hydraulic test. The hydrostatic process of the spacer is simulated and analyzed and the simulation result and the test result are in agreement. The study result shows that the destructive pressure of the three-phase enclosed insulating spacer is 2.6 MPa and the corresponding maximum destructive stress is 78.28 MPa. The hydrostatic destruction shows brittle destruction and the weak position of the spacer is at the position with maximum variation of curvature of arc surface.