【摘要】 介绍一种通用反时限特性在微机保护中的实现方法,反时限函数中的各参数不要求为固定值,可灵活整定,具有通用性。该方法以数学分析为基础,将算式经过适当转换,采用特定的算法,使多项式计算的收敛速度很快,计算量小,耗时少,计算精度高,也不需额外的硬件资源(如用EEPROM存放表格数据)。文中还进行了误差分析,结果表明,即使运算中的多项式项数取得很少(如n=2或3),该算法的误差也非常小,完全能满足实际应用的需要。更多还原

【Abstract】 An algorithm for realizing the universal inverse time-lag characteristic in microprocessor-based protection is put forward. As all parameters in the inverse time-lag characteristic are flexible with none required to be fixed in this method, it is a universal one. Based on the mathematical analysis, appropriate conversion and special arithmetic, this realization is of accelerated convergence in calculation. Not only is the arithmetic of high operational accuracy, but also it takes less calculation time because of its smaller calculation amount. Furthermore it doesn’t need hardware memory chips such as EEPROM to store tabular data. An error analysis is also made, which shows that the method is suitable for application for its excellent accuracy.更多还原