Abstract
Pillar electrical equipment is an important part of substations. The application of composite materials in pillar equipment can facilitate the improvement of the seismic performance of electrical equipment. In this paper, the test of elastic modulus and bending rigidity was conducted for individual composite elements in insulators and arresters, and the calculation formula for bending rigidity at the composite flange cementing connections was put forward. The numerical simulation model for the earthquake simulation shaking table test of ±1,100 kV composite pillar insulators was established, in which the bending rigidity value for the flange cementing part was obtained by the test or calculation formula. The numerical simulation results were compared with the earthquake simulation shaking table test results, the dynamic characteristics and seismic response of the model were compared, respectively, the validity of the proposed calculation formula for flange bending rigidity of composite cementing parts was verified, and a convenient and effective means was provided for calculating the seismic performance of composite electrical equipment.
Highlights
Pillar electrical equipment, such as pillar insulators and arresters, is an important part of electrical equipment in substations. e insulators are the electrical equipment components in the substations used to support the live wires or tubular busbars, accommodate the electrical elements, and provide the insulation distance. e traditional pillar electrical equipment is made of porcelain materials
E pillar electrical equipment is generally assembled by individual elements connected by flanges. e bending rigidity of flange cementing points is essential for the seismic analysis of electrical equipment
Zhu et al [7] conducted the bending rigidity test of UHV porcelain bushing components, corrected the bending rigidity coefficient formulas proposed in the standards in China and Japan, and provided the calculation formula for flange bending rigidity suitable to UHV porcelain electrical equipment
Summary
Pillar electrical equipment, such as pillar insulators and arresters, is an important part of electrical equipment in substations. e insulators are the electrical equipment components in the substations used to support the live wires or tubular busbars, accommodate the electrical elements, and provide the insulation distance. e traditional pillar electrical equipment is made of porcelain materials. Sheng et al [24] tested the dynamic characteristics of composite insulators and the bending rigidity of flange connections and pointed out that, since the cementing structure of composite insulators is quite different from that of porcelain insulators, the calculation formula for flange bending rigidity proposed in the standards in China and Japan is no longer applicable to composite equipment. The test of elastic modulus and bending rigidity was conducted for individual elements in composite insulators and composite arresters, and the calculation formula for bending rigidity at flange connections was obtained by the analysis and research of test data. E methods of numerical simulation and earthquake simulation shaking table test were used to conduct the comparative study on the seismic performance of ±1,100 kV pillar insulators, and the validity of the proposed calculation formula for flange bending rigidity was verified. The average bending rigidity of the flange cementing part of insulator A6 is about 41,377 kN·m/rad. e bending rigidities of flange cementing parts of remaining insulators are shown in Table 3, in which the unit of bending rigidity is kN·m/ rad
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