【摘要】 在对现有输电线路电流差动保护判据研究的基础上, 提出了一种归一化电流差动保护判据。在对模拟量进行归一化处理的基础上,利用归一化的模拟量相量之和作为差动量,相量之差作为制动量,进行差动比较,从而给出故障判别结果。与现有电流差动保护判据相比,在保证区外故障不误动的同时能显著提高区内故障的灵敏度。当采用故障分量进行差动比较时,该判据具有更优良的动作性能。文章从理论分析与仿真实验的角度给出了该判据的适用范围,验证了其正确性。更多还原

【Abstract】 On the basis of analyzing existing criteria for current differential protection of transmission line, a normalized criterion for current differential protection is proposed. After normalizing analogue inputs, in the proposed criterion the phasors sum of normalized analogue inputs is used as differential component of the criterion while the phasors difference as its restraint component, then the differential comparison is performed and the distinguished result for the fault is given. Comparing with existing criteria for current differential protection, the proposed criterion can evidently improve the sensitivity for internal faults without misoperation caused by external faults. When the faulty component is used to perform differential comparison, the proposed criterion possesses better operation performance. The application range of the proposed criterion is given by both theoretical analysis and simulation testing, and its correctness is verified.更多还原