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Determination of the Mechanical Properties of Flexible Connectors for Use in Insulated Concrete Wall Panels

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Published on: October 19, 2022

A degraded cantilever model for post insulators under cyclic loading.

Qilin Sun¹, Guanglin Yuan^2,3, Xinghui Wu⁴

¹School of City and Architecture Engineering, Zaozhuang University, Zaozhuang, 200160, China.

Scientific Reports

|May 29, 2026

Summary

Substation post insulators show limited damping and stiffness degradation under seismic loads. Accounting for plastic deformation improves equipment seismic resilience by 10-12%.

Keywords:

Post insulators Quasi-static cyclic testing Seismic performance Support-type tubular busbar structures

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Area of Science:

Electrical Engineering
Structural Engineering
Materials Science

Background:

Support-type tubular busbar structures in substations are susceptible to earthquake damage.
Post insulators are critical components in these structures, influencing overall seismic performance.

Purpose of the Study:

To experimentally characterize the seismic load-resisting behavior and deformation mechanisms of post insulators.
To develop a model for predicting the dynamic response of post insulators under seismic loading.

Main Methods:

Quasi-static cyclic loading tests were performed on post insulators under simulated 220 kV substation conditions.
Experimental data on load-resisting behavior, deformation, damping, and stiffness degradation were analyzed.
A composite cantilever-beam model incorporating stiffness degradation was developed.

Main Results:

The porcelain body exhibited elastic behavior, while localized plastic deformation occurred at the porcelain-cast-iron sleeve interface.
The effective viscous damping ratio was below 1.5%, indicating low energy dissipation capacity.
Significant stiffness degradation was observed, with secant lateral stiffness decreasing by 48% at 50 mm and 67% at 100 mm displacement.

Conclusions:

The study highlights the vulnerability of post insulators to seismic events due to limited damping and stiffness degradation.
The proposed model accurately represents post insulator dynamic response, incorporating stiffness degradation.
Including porcelain-sleeve interface plastic deformation in seismic design increases equipment flexural strength by 10-12%, enhancing seismic resilience.