Abstract
Based on an actual ultra-high voltage (UHV) substation, a finite element (FE) model for a high-voltage (HV) bushing, arrester, and down lead transmission line (DLTL) system was built using ANSYS software. The dynamic responses of the system under different seismic intensities were analyzed and compared with those of the corresponding single bushing and arrester. On this basis, the coupling vibration influence of the upper DLTL on the responses of the HV bushing and arrester is discussed. The results indicate that the DLTL adversely affects the responses of the HV bushing and arrester under seismic loading. As the seismic intensity increases, the structural displacements at the top of the HV bushing and arrester increase, accompanied by a reduction in the geometric length redundancy of the DLTL, resulting in a mutual pulling effect between the HV bushing and the arrester and the quick amplification of their respective dynamic responses in a nonlinear form. Under the action of an earthquake with a peak ground acceleration (PGA) of 0.4 g, the maximum stresses at the roots of the HV bushing and the arrester in the system separately increase by approximately 13.02% and 7.80% compared to the corresponding single HV bushing and the arrester. Overall, a geometric length redundancy of at least 200 mm in the DLTL in engineering design is recommended.
Highlights
Electric power systems involve all aspects of people’s lives and are the main energy supply system in modern society [1]
HV bushings and lightning arrestors are often connected to in-station jumpers by “λ”-shaped down lead transmission lines (DLTLs) (Figure 1)
Due to the limits of laboratory test conditions and the structural complexity of the actual HV bushings, arresters, and DLTL-connection systems, the current shaking table test studies of the interactions between flexible conductors and interconnection substation equipment are based on some simple test models that are quite different from actual structures
Summary
Electric power systems involve all aspects of people’s lives and are the main energy supply system in modern society [1]. Wang et al [12] used a shaking table and a group of artificial seismic waves to experimentally study a certain model of a 1100 kV ultra-high voltage (UHV) gas-insulated switchgear porcelain bushing based and obtained the acceleration, displacement, and strain responses of key parts of the porcelain bushing. Ma et al [18] clarified the importance of dynamic interactions between high-voltage bushings, turrets, and power transformer tanks through numerical simulations These studies are of great importance for the seismic analysis and optimal design of HV substation structures. Due to the limits of laboratory test conditions and the structural complexity of the actual HV bushings, arresters, and DLTL-connection systems, the current shaking table test studies of the interactions between flexible conductors and interconnection substation equipment are based on some simple test models that are quite different from actual structures. The acceleration response, displacement response, and stress response of the key parts of the high-voltage casing system under the action of three different peaks of 0.07, 0.2, and 0.4 g, are used to determine the safety factor and compare the safety factor with the seismic design code for power facilities GB50260 required in 2013
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