变压器微机卡尔曼滤波差动保护

A DIGITAL DIFFERENTIAL PROTECTION FOR A 3-PHASE POWER TRANSFORMER BASED ON KALMAN FILTERING THEORY

本文对三相三柱变压器的磁路进行了分析,建立了三相变压器励磁涌流计算的数学模型.在对仿真结果分析的基础上,应用卡尔曼滤波原理来实现谐波制动的变压器微机差动保护经过在CRHS微机保护仿硬件开发系统上进行仿真运行表明:保护能迅速地切除故障,可靠地闭锁变压器励磁涌流和过励磁.

This article analyses the flux paths of a 3-phasc 3-limb transformer and gives a mathematical model of a 3-phase transformer inresh calenlation Based on the calculation result analysis, the kalman filtering theory is used to fulfil the digital harmonic restraint transformer differential protcction. Affer rumming in a Cormputer Relay Hardware System, the protection shows: it can trip a transformer fault fast, und gives good restraint during the megnetising inrush or overxcitation of a transformer.