中文摘要：

依据数字继电保护系统的功能和特点,提出一种保护系统的行为树模型及其可靠性定量评估方法。给出硬件部件、软件行为、顺序和选择关系的可靠度模型。对现有行为树模型进行概率扩展后完成对保护系统的建模,给出行为可靠度计算公式以进行保护系统可靠性定量评估。算例仿真计算结果表明,所提方法可正确评估保护系统可靠性,进行薄弱环节识别。

英文摘要：

According to the functions and characteristics of digital relay protection system,the model of its behavior trees and the quantitative evaluation of its reliability are proposed. The reliability models are given for its hardware components,software behavior,sequence relation and selection relation. The existing behavior tree model is probabilistically extended,based on which the relay protection system is modeled. The calculative formula of behavior reliability is given,based on which the protection system reliability is quantitatively evaluated. The simulative results of case study show that,the proposed method can correctly evaluate the reliability of relay protection system and identify its weak parts.