超/特高压交流变电站噪声特性对于其噪声预测与控制具有重要意义。以750 k V交流变电站为研究对象,对变电站内变压器、高压电抗器、带电架构以及站界噪声水平、频谱分布以及衰减特性进行了系统测量与分析。结果表明,750 k V变电站噪声...超/特高压交流变电站噪声特性对于其噪声预测与控制具有重要意义。以750 k V交流变电站为研究对象,对变电站内变压器、高压电抗器、带电架构以及站界噪声水平、频谱分布以及衰减特性进行了系统测量与分析。结果表明,750 k V变电站噪声水平较高,变电站各主要噪声源之间存在相互影响,变压器500 Hz以下的中低频噪声水平较高,冷却系统对变压器频谱分布具有较大影响,电抗器噪声最高可达80.3 d B(A),带电架构噪声最低为61.2 d B(A),站界噪声分布与变电站内各主要声源的布置方式有关。展开更多
Considering the complex environment in 750 kV AC substation,porcelain insulators have particular electric field and voltage distribution in comparison with those used in AC transmission line,meanwhile,the investigatio...Considering the complex environment in 750 kV AC substation,porcelain insulators have particular electric field and voltage distribution in comparison with those used in AC transmission line,meanwhile,the investigation of a typical 750 kV AC substation located in Lanzhou with ultraviolet imager(UVI) demonstrated that the corona discharge of some insulators is serious due to the improper structure design and installation,so research on porcelain insulators used in substation is needed.The three-dimensional finite element method(FEM) 750 kV AC substation calculation model was established to calculate electric field and voltage distribution of insulators,and the voltage distribution curves along insulators which are classified by type and suspension location were obtained using a novel FEM method which can effectively reduce the calculation amount without losing accuracy,meanwhile,the effect of the grading ring for improving voltage distribution of insulators was studied by adjusting the structure parameters of grading ring. Consequently,an optimization structure of rings was proposed by improving the voltage distribution of insulator string and reducing the electric strength of grading ring for the purpose of restricting corona noise,and the onsite observations by UVI showed that the newly manufactured and installed grading ring could obviously avoid the occurrences of corona discharge which validates the optimization design.This paper proposed an effective method combining UVI observation and FEM calculation to study voltage-sharing characteristics of porcelain insulators,and the results can provide experiences and references for the design of 750 kV AC substation.展开更多
文摘超/特高压交流变电站噪声特性对于其噪声预测与控制具有重要意义。以750 k V交流变电站为研究对象,对变电站内变压器、高压电抗器、带电架构以及站界噪声水平、频谱分布以及衰减特性进行了系统测量与分析。结果表明,750 k V变电站噪声水平较高,变电站各主要噪声源之间存在相互影响,变压器500 Hz以下的中低频噪声水平较高,冷却系统对变压器频谱分布具有较大影响,电抗器噪声最高可达80.3 d B(A),带电架构噪声最低为61.2 d B(A),站界噪声分布与变电站内各主要声源的布置方式有关。
文摘Considering the complex environment in 750 kV AC substation,porcelain insulators have particular electric field and voltage distribution in comparison with those used in AC transmission line,meanwhile,the investigation of a typical 750 kV AC substation located in Lanzhou with ultraviolet imager(UVI) demonstrated that the corona discharge of some insulators is serious due to the improper structure design and installation,so research on porcelain insulators used in substation is needed.The three-dimensional finite element method(FEM) 750 kV AC substation calculation model was established to calculate electric field and voltage distribution of insulators,and the voltage distribution curves along insulators which are classified by type and suspension location were obtained using a novel FEM method which can effectively reduce the calculation amount without losing accuracy,meanwhile,the effect of the grading ring for improving voltage distribution of insulators was studied by adjusting the structure parameters of grading ring. Consequently,an optimization structure of rings was proposed by improving the voltage distribution of insulator string and reducing the electric strength of grading ring for the purpose of restricting corona noise,and the onsite observations by UVI showed that the newly manufactured and installed grading ring could obviously avoid the occurrences of corona discharge which validates the optimization design.This paper proposed an effective method combining UVI observation and FEM calculation to study voltage-sharing characteristics of porcelain insulators,and the results can provide experiences and references for the design of 750 kV AC substation.
