基于参数辨识的变压器微机保护

建立了变压器的线性模型，该模型无需涉及变压器铁心的非线性关系和磁滞效应。进 而依据变压器在正常运行、励磁涌流以及外部故障时结构及某些参数不变，而内部故障时 结构及参数会改变的原理，提出了一种基于变压器参数辨识的变压器保护方法，该方法无需 鉴别励磁涌流。经仿真计算验证，该方法能有效地区分内部故障和励磁涌流、外部故障及正 常运行状态。

TRANSFORMER PROTECTION USING PARAMETER IDENTIFICATION METHOD

The linear model of transformer is established. The model does not include the consideration of non-linearity and hysteresis effect of iron corn. Then based on the identification of winding parameter, a new transformer protection method is presented. It is based on the principle that the structure and some pexternal fault and normal operation, however, change will take place during internal fault. Digital simulation shows that the proposed method can distinguish internal fault from external fault, magnetizing inrush current, normal operation.