Estimation of Required Slack for Conductors Connecting Substation Equipment Subjected to Earthquake

Mohammadi, Reza Karami; Nikfar, Farzad; Akrami, Vahid

doi:10.1109/tpwrd.2011.2181428

Cited by 13 publications

(4 citation statements)

References 5 publications

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“…C v is the damping matrix based on the stiffness‐proportional damping coefficient β :

C_{V} = β K_{V}

Since the first mode dominated the response of the post equipment, the post insulator was normally idealized as a single degree of freedom (SODF) oscillator 17,18 with characters of effective mass m p , stiffness k p , damping c p , and mode participant factor γ p . Alternatively, the characters of the idealized post insulator could be expressed in a more convenient way by using the natural frequency f p and damping ratio ξ p :

m_{p} = k_{p} / ((), 2 π f_{p})

c_{p} = 2 m_{p} ((), 2 π f_{p}) ξ_{p}

Since the post insulator could be idealized as a cantilever beam with the same profile along its height, γ p was set at 1.56.…”

Section: Parametric Analysis Of the Seismic Response Of An Interconnementioning

confidence: 99%

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Dynamic behavior of multilayer suspension equipment and adjacent post insulators with elastic‐viscous connections

Yang

Xie

2020

Struct Control Health Monit

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“…C v is the damping matrix based on the stiffness‐proportional damping coefficient β :

C_{V} = β K_{V}

m_{p} = k_{p} / ((), 2 π f_{p})

c_{p} = 2 m_{p} ((), 2 π f_{p}) ξ_{p}

Since the post insulator could be idealized as a cantilever beam with the same profile along its height, γ p was set at 1.56.…”

Section: Parametric Analysis Of the Seismic Response Of An Interconnementioning

confidence: 99%

“…The coupling effect between electrical equipment with different dynamic properties tends to amplify the seismic response of the higher‐frequency item 15 . Therefore, there should be sufficient slack in flexible conductors, and an additional static load is proposed for the design of stand‐alone post equipment 16,17 …”

Section: Introductionmentioning

confidence: 99%

Dynamic behavior of multilayer suspension equipment and adjacent post insulators with elastic‐viscous connections

Yang

Xie

2020

Struct Control Health Monit

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“…Kiureghian et al analyzed the seismic performance of the equipment coupled with seismic forces by establishing a theoretical model [17]. In 2012, Kara Mohammadi et al analyzed several common forms of soft bus connecting substation equipment and the influence of different parameters on the interaction forces between equipment [18]. Li et al used the rod element large deformation finite element method to discuss the influence of wires on the seismic performance of electric porcelain type electrical equipment and the interaction between electrical equipment connected by wires.…”

Section: Introductionmentioning

confidence: 99%

Seismic performance analysis of double electrical equipment system connected by flexible conductors

Wang,

Hong,

Min

et al. 2024

E3S Web Conf.

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Structural characteristics of electrical equipment are influenced by connected flexible conductors. In order to study the seismic performance of the double electrical equipment system (DEES) with flexible conductors, a simplified modeling method of the DEES with flexible conductors was proposed in this paper. The refined finite element model of the DEES with flexible conductors was established using ANSYS software. Its seismic response level was analyzed and compared with that of the standalone equipment. Besides, the impact of ground motion input was also investigated. The results show that the first two modal frequencies of the DEES will be reduced by the flexible conductor. The flexible conductor can reduce the seismic responses of the low-frequency equipment in the DEES, while it increases seismic responses of the high-frequency equipment. When the slack of the flexible busbar is greater than a critical value, the additional pulling force on the top of the equipment caused by the busbar can be kept at a low level, which is also related to the ground motion input.

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“…Predominant failure modes include bushing root fracture and equipment dislocation at flange joints due to flange cement failure. An additional mode of earthquake damage reflects tensile stresses affecting interconnecting cables [12][13][14][15]. Figure 1 depicts typical seismic loading-induced equipment damage: the upper component is a porcelain insulator and the lower one is a frame.…”

Section: Introductionmentioning

confidence: 99%

On the Nonlinear Seismic Responses of Shock Absorber-Equipped Porcelain Electrical Components

Zhu

Zhang

Cheng

et al. 2020

Mathematical Problems in Engineering

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Porcelain electrical equipment is prone to brittle failure due to resonance under seismic effects. To improve its seismic resistance, some researchers have conducted research on shock absorption technology for porcelain electrical equipment. However, extant research fails to provide a detailed and systematic study of the effect of the nonlinear characteristics of these shock absorbers on the performance of equipment under seismic effects. This paper provides a theoretical analysis, verified by shaking table testing, of the performance of a 1000 kV pillar-type porcelain lightning arrester. The Bouc–Wen model is fitted to the force-displacement curve of hysteretic nonlinear metal shock absorbers, and a dynamic model of, and equations for, pillar-type porcelain electrical components are derived, taking into account their nonlinear characteristics. This reveals the influence of the nonlinear characteristics of shock absorbers on the nonlinear seismic response characteristics of these components. Our results indicate that the seismic responses of pillar-type porcelain components can be effectively suppressed by hysteretic nonlinear shock absorbers and that the greater the intensity of the seismic waves, the more obvious the efficiency of shock absorption. However, as the installation radius and yield force of the installed shock absorbers increase, their shock absorption efficiency gradually decreases.

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Estimation of Required Slack for Conductors Connecting Substation Equipment Subjected to Earthquake

Cited by 13 publications

References 5 publications

Dynamic behavior of multilayer suspension equipment and adjacent post insulators with elastic‐viscous connections

Dynamic behavior of multilayer suspension equipment and adjacent post insulators with elastic‐viscous connections

Seismic performance analysis of double electrical equipment system connected by flexible conductors

On the Nonlinear Seismic Responses of Shock Absorber-Equipped Porcelain Electrical Components

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