【摘要】 500 kV变电站采用一个半开关的接线方式,这种接线方式有一定裕度,合理利用这一裕度就可以实现提升线路输送容量的目的。本文计算出500 kV变电站串内电流分布的传递函数矩阵,获取每一串内开关与各电流源电流之间的分配关系,同时得知电流源变动对串内电流分布的影响。实测得到不同类型高压断路器接触电阻随触头流经电流、接触压力、所处温度、机械动作次数、产品类型之间的关系,并进行了线性曲线拟合,得到了拟合公式。对等接触电阻条件下的500 kV变电站串内电流分布PSCAD仿真模型进行考虑实际情况接触电阻变化的修正,使仿真结论更精确。更多还原

【Abstract】 One and a half main wiring connection is mostly used in 500 k V substations,which has a certain margin to upgrade transmission line capacity. This paper calculated transfer function matrix of main wiring connection of 500 k V substation. Therefore distribution features between each switch in each string and every current source were unrevealed; meanwhile,current distribution changes via changes of current sources were explored. Actual measurement exposes the relationship between contact resistances of HV circuit breakers and current,pressure,temperature,mechanical action times,and product types. Linear curve fitting of actual measurement was conducted and fitting formulas were defined. PSCAD simulation model of 500 k V substations under equal contact resistances circumstances was revised considering contact resistance variations in order to draw a more precise conclusion.更多还原