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基于瞬态场路耦合模型的变压器直流偏磁计算

, PP. 174-181

Keywords: 变压器直流偏磁,瞬态场路耦合,注入方式,动态电感

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Abstract:

利用变压器瞬态场路耦合模型,计算单相变压器的直流偏磁问题。对比在一次侧和二次侧注入直流时变压器的直流偏磁情况,结果说明两种注入方式下交流电流的波形基本相同。分析变压器直流偏磁时交流磁场和电路等效参数的变化,变压器直流偏磁时励磁电流波形畸变,其峰值与各次谐波含量均随直流电流增大而增加;动态电感取决于励磁的饱和程度,其波形在交流励磁的正负半周并不对称,两种运行方式下场路耦合参数受直流影响的变化规律相同。负载运行直流偏磁时动态漏电感波形畸变,外侧一次绕组的漏磁通增大。当直流电流超过一定值时,变压器发生偏磁时的励磁电流峰值与直流电流近似呈线性关系。最后,通过实验验证了瞬态场路耦合方法的准确性和可行性,为变压器直流偏磁计算提供新方法。

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