Seismic Performance Assessment of Electrical Substation Equipment

Electrical substations are critical nodes in power transmission networks, and their reliable function during and after seismic events is essential to maintain energy supply and safeguard infrastructure. Seismic performance assessment of substation equipment encompasses analytical modelling, experimental testing and probabilistic evaluation to predict and enhance the capacity of components such as insulators, transformers, circuit breakers and arresters under earthquake loading. Analytical approaches include nonlinear dynamic models that capture material and connection behaviour, stochastic methods to represent ground motion variability and network‐level reliability models to assess system redundancy and vulnerability. Experimental techniques range from shaking‐table tests on full‐scale specimens to multibody simulations of isolation devices. Probabilistic frameworks such as fragility curve derivation and reliability simulation quantify the likelihood of damage states, enabling risk‐informed design and retrofit strategies. Recent advances emphasise composite materials, novel isolation systems, integrated machine‐learning predictions and system‐level resilience assessment, all aimed at ensuring that substations can withstand seismic excitations with minimal loss of function and rapid post‐earthquake recovery.

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Seismic Performance Assessment of Electrical Substation Equipment publication trend

The graph below shows the total number of articles in seismic performance assessment of electrical substation equipment across all publications each year (not limited to Nature Index journals).

Technical terms

Nonlinear dynamic model: A mathematical representation of equipment response that accounts for material and connection nonlinearity under seismic loading.

Shaking-table test: An experimental method where full-scale or scaled specimens are subjected to controlled ground motions to assess seismic performance.

Fragility curve: A probabilistic function expressing the likelihood of reaching or exceeding defined damage states as a function of seismic intensity.

Stochastic ground-motion model: A representation of earthquake excitation that incorporates random variability in amplitude and frequency content to reflect real seismic records.

Composite insulator: An insulator made from fibre-reinforced polymers, offering enhanced flexibility and energy dissipation compared with traditional porcelain.

References

1. Full-Scale Testing on Seismic Performance of Surge Arrester with Retrofitted Composite Insulators. Buildings (2022).
2. Stochastic Response of Composite Post Insulators under Seismic Excitation. Buildings (2024).
3. Multibody Modeling Method for UHV Porcelain Arresters Equipped with Lead Alloy Isolation Device. Shock and Vibration (2021).
4. Shake Table Testing of Voltage and Current Transformers and Numerical Derivation of Corresponding Fragility Curves. Infrastructures (2022).