| Abstrakt: |
Purpose: Due to the use of brittle materials and special structure, the porcelain column electrical equipment is easy to be damaged in the earthquake, so it is necessary to carry out the research on the damping control of this kind of equipment. Methods: In this study, the damping control test and finite-element analysis of T-shaped circuit breaker model were implemented using shape memory alloy cables. First, based on the similarity theory, an experimental model with a scale of 1/4.5 is designed and made, and the seismic response control study on the circuit breaker model with the shape memory alloy (SMA) is implemented under different peak ground acceleration (PGA) of earthquake motion. Then, the inertia and springs/dashpots in the special setting module of ABAQUS are selected to simulate the SMA control, and the finite-element analysis of seismic response of circuit breaker model is carried out and compared with the test results. Finally, the study discussed the influence of the effective length and dip angle of the SMA cables on the damping performance for circuit breaker. Results: The results show that the SMA passive cable damping system can effectively reduce the top seismic response of T-shaped porcelain column circuit breaker. When PGA is 8 m/s2at El Centro wave, the reduction rates of displacement and acceleration response are 38.1% and 21.1%, respectively. Meanwhile, the finite-element analysis results of dynamic response of circuit breaker model are in good agreement with experiment results, which verifies the validity of the established finite-element model. Moreover, the SMA lasso damping device can effectively reduce the porcelain bushing root stress of the circuit breaker in the earthquake, when the length of SMA wire is 200 mm, the dip angle is 60°, the SMA cable system has the best damping effect on the circuit breaker model. Conclusion: The research results are of great significance to ensure the safe operation of the power system under the earthquake action. |
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