发展性短路故障对变压器差动保护的影响

【作者】 董立；

【导师】 徐习东；

【作者基本信息】 浙江大学 ， 电力系统及其自动化， 2004， 硕士

【摘要】 针对变压器发生匝间短路，并且短路匝数随时间增大的现象，提出了变压器发展性短路故障模型，本模型基于一个幅值随时间增加的三角函数来模拟连续发展的故障电流；分析了故障发展速度不同的各种情况下，故障电流波形中二次谐波及间断角的变换规律，得出了此类故障电流对两种不同原理的变压器差动保护的影响。为今后分析变压器差动保护在发展故障下的拒动，提供了一种思路。同时针对变压器保护理论的发展，本人提出了一些对保护装置的改进方案。更多还原

【Abstract】 The phenomenon of turn to turn fault developing as time go on,a model of transformer progressive short circuit fault put forward , the model based on a trigonometric function with the amplitude increasing with the time was proposed to simulate the progressive fault current . The change rules of the secondary harmonics and dead angle of the fault current waveform under various developing rates were analyzed and the effect of the fault current on two kinds of transformer relay protection of different principles was obtained, which will provide a correct concept on analysis of the protest of differential protection during a progressive failure in the transformer. Due to the development of the transformer protection theory , some better design of the transformer protection device was advanced.更多还原