特高压变压器保护的研究  

Application of SMS Platform System in Electric Power Corporation Information ConstructionStudy on Protection of UHV Power 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：《河南电力》2010年第2期1-4,共4页Henan 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。本文提出了基于有功功率损耗的匝间短路辅助判据，该方法的原理是：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 ,leading to the short time delay of operation of protection.Upon that,we bring forward a new method to discriminate between interturn fault and magnetizing inrush based on active power loss.The elements of this method is that the active power loss of transformer is very little when operate normally,but the active power loss will increase rapidly in inner fault conditions.Simulations suggest that this method can not work for most fault conditions, but it can respond exactly for light interturn fault.Fitly,it reinforces the second harmonic blocking to be an integrative principle.

关 键 词：特高压变压器 二次谐波 匝闻短路 差动保护 有功损耗 

分 类 号：TM772[电气工程—电力系统及自动化]