特高压变压器保护的研究  

Research on protection of ultra high voltage transformer

作　　者：张双平[1] 曾麟钧[1] 

机构地区：[1]三峡大学电气信息学院,湖北宜昌443002

出　　处：《江西电力》2009年第6期34-37,共4页Jiangxi Electric Power

摘　　要：由于特高压变压器发生轻微匝间短路时电流中二次谐波含量过高,会导致差动保护动作延迟。由此,提出了基于有功功率损耗的匝间短路辅助判据。其原理是变压器正常运行时消耗的有功功率非常小,而发生内部故障时产生的有功损耗非常大。仿真结果表明该方案虽不能作用于大多数故障情况,却能准确反应于轻微匝间短路,正好与二次谐波制动方式互补,形成综合判据。In some light interturn fault conditions of UHV （Ultra High Voltage） transformer, the second harmonic ratio of the fault current is relatively high which cause protection operation delay. Therefore, we put forward a new method to discriminate between interturn fault and magnetizing inrush based on active power loss. The theory of this method is that the active power loss of transformer is very little when operate normally, while the active power loss would increase rapidly in inner fault conditions. Simulation suggests that this method can respond exactly for light interturn fault though it cannot work in most fault conditions. The result reinforces the second harmonic blocking to be an integrative principle.

关 键 词：特高压变压器 二次谐波 匝间短路 差动保护 有功损耗 

分 类 号：TM772[电气工程—电力系统及自动化]