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电网技术  2011 

变压器空载合闸漏感参数识别方法

, PP. 194-198

Keywords: 变压器保护,回路方程,归一化漏电感,励磁涌流,内部故障电流

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Abstract:

基于变压器回路方程计算漏感参数的方法,需要已知变压器各侧电压和电流等电气量信息。但在现有变电站内,当变压器空投时,无法获取空载侧电压。因此提出一种适合于变压器空载合闸情况下计算漏感参数的新方法,仅需要知道正常变压器的电阻和漏感参数,利用差分方程递推方法,即可快速计算出变压器空载合闸情况下的漏感参数。在此基础上,将漏感参数进行归一化处理,使保护定值的选取更具有普遍性。动模试验分析结果表明,新方法不受变电站电压互感器安装位置的影响,能够迅速、可靠地切除变压器内部故障,对轻微故障也有足够的灵敏度。

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