变压器差动保护误动与防治措施分析

Analysis on the Malfunction and Preventive Measures of Differential Protection of a Transformer

电力变压器是电力系统中重要的设备,在电力系统安全运行中起着至关重要的作用。差动保护是主变压器的主保护,其安全可靠性对变压器保护影响尤为关键,其误动或拒动都将给电网安全稳定运行造成很大威胁,同时也有可能造成巨大的经济损失。基于此,首先以双绕组单相变压器的纵差动保护为例分析了差动保护的基本原理,然后分析了变压器差动保护误动作的原因,最后介绍了几种变压器差动保护误动作的防治措施。

A power transformer is important equipment of electric power systems ,which plays an important part in safe operation of hte power system. Differential protection is main protection of a main transformer, whose safe reliability is special importance to the tranformer protection. The mulfunction and failure to actuate will cause great threat for the safe operation of the grid, meanwhile it may cause great economic losses. For this, first, take the longitudinal differential pro- tection of double winding single-phase transformer as an example, analyzing the basal principle of the differential proted- tion, then analyze the reason of the differential protection mulfunction of the transformer. Finally, present preventive meas- ures of the differential protections of transformers.