【摘要】 电力变压器额定容量日益增大造成变压器铁心内的剩磁问题越来越严重，导致变压器空载损耗增大、铁心震动剧烈，对变压器诊断试验结果产生不利影响。提出一种基于剩磁（remanent flux,RF）影响的变压器诊断试验结果治理方法，能够以充分减少最终剩磁的方式连续消除剩磁。充分分析和总结了变压器铁心产生严重剩磁的常见原因，并全面探讨剩磁对变压器空载测试等试验项目的负面影响。详细阐述了所提出的快速消磁方法的基本概念和相关计算模型，对快速消磁方法流程图和实现步骤进行了说明。数值分析验证了所提方法可将RF限制到拐点磁通的0.18%，较传统消磁方法的0.014 6 T减小了79.5%，消磁时间和耗能分别减少了58.1%和77.9%；现场实测结果也表明了所提方法可以对变压器铁心进行快速准确消磁。更多还原

【Abstract】 The increasing demand for power transformer rated capacity has given rise to increasingly severe residual flux(RF) issues within transformer cores. This phenomenon leads to heightened no-load losses and intense core vibrations, adversely impacting transformer diagnostic test results. To address this, we propose a transformer diagnostic test result governance method based on RF influence, enabling continuous elimination of RF in a way that fully reduces the final residual magnetism. We thoroughly analyze and summarize the prevalent causes of acute RF in transformer iron cores, while comprehensively exploring its detrimental effects on test items such as transformer no-load testing. This paper elaborates in detail on the fundamental concepts and associated calculation models of the proposed fast demagnetization method, alongside explaining its flowchart and implementation steps. Numerical analysis verification demonstrates that the proposed method limits RF to 0.18% of the inflection point magnetic flux—a 79.5% reduction in residual magnetism compared to the traditional demagnetization method’s 0.014 6 T. Furthermore, demagnetization time and energy consumption are reduced by 58.1% and 77.9%, respectively. On-site measurement results also confirm the method’s efficacy in rapidly and accurately demagnetizing transformer cores.更多还原