Abstract
This paper presents a multibody modeling method for seismic analysis of UHV porcelain surge arresters equipped with a kind of seismic isolation device. An UHV arrester is modeled as a planar multibody system whose number of DOF is equal to the number of the arrester units. Joint coordinate method is adopted to construct the governing equations of motion. The seismic isolation device utilizing a number of lead alloy dampers as its core energy dissipation components is also investigated. An analytical model of this device is given by modeling each lead alloy damper as a hysteretic spring and reducing the entire device to a planar system consisting of a range of hysteretic springs. Its mechanical characteristic is derived theoretically, and the obtained moment-angle relationship is expressed as a system of differential algebraic equations. The initial rotational stiffness of the device is formulated in terms of the structural and mechanical parameters of the device. This analytic expression is used in estimating the fundamental frequency of the isolated equipment. By this modeling method, it is easy to construct the governing equations of motion for the isolated system. An UHV arrester specimen is analyzed by this proposed method. The effectiveness of the isolation device in terms of reducing the internal base moment is significant and the influence of system parameters on the effectiveness is also discussed. The proposed method shows its potential usefulness in optimal design of the isolation device.
Highlights
Surge arrester is one of the core components of an electrical substation
The use of wire rope in base isolation for circuit breakers has been investigated in [2, 3]. e wire rope isolator was modeled by a modified Bouc–Wen model, and the isolated equipment was analyzed by finite element (FE) method
A novel modeling method has been proposed for the seismic analysis of ultra-high voltage (UHV) porcelain arresters equipped with an isolation device
Summary
Surge arrester is one of the core components of an electrical substation. Nowadays, porcelain-housed metal oxide varistor (MOV) surge arresters are commonly equipped in substations. A 4-DOF system was introduced in [18] to model support-equipment structures in substations and the influence of structure parameters on the dynamic properties of the system was analyzed by using the proposed simplified model. The current Chinese Code [20] in China recommends a simplified massspring modeling method with special care on the stiffness property of the flange joint. E aim of this paper is to present a new modeling method for UHV porcelain surge arresters equipped with the novel seismic isolation device investigated in [12]. An analytic expression for the initial rotational stiffness of the isolation device is obtained, which is formulated in terms of the structural and mechanical
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