计及变压器负载的和应涌流产生机理与仿真分析

Principle and Simulation Analysis of the Transformer Sympathetic Inrush Considering Transformer Load

中文关键词:变压器  和应涌流  励磁涌流  磁链  仿真  保护

keywords:transformer  sympathetic inrush  magnetizing inrush  flux  simulation  protection

中文摘要:针对变压器空载合闸时相邻在运变压器会产生和应涌流的问题，提出计及变压器负载的和应涌流产生机理分析方法及保护防误动对策。首先，基于磁链变化模型，推导出带载运行变压器各阶段的磁链变化量表达式，系统阐述了和应涌流的产生机理及变化特点，提炼出了影响和应涌流的因素。然后，利用实时数字仿真系统对变电站一次系统进行建模，复现了和应涌流现象，仿真分析了合闸角、系统联系电阻、负载对和应涌流的影响，得出了与理论分析一致的结论，并提出了在电压峰值时刻合闸、加强与系统间联系、增加运行变负载可有效抑制和应涌流的影响。最后，针对和应涌流对保护的影响提出了相应防误动对策。

Abstract:In response to the issue that sympathetic inrush may occur in adjacent operating transformers during the no-load closing of a transformer, an analytical method for the generation mechanism of sympathetic inrush considering the load of the transformer and countermeasures to prevent maloperation of the protection are put forward. first of all， based on the flux variation model， the expressions for the flux variation of the transformer under load operation at each stage are derived， the principle and characteristics of the sympathetic inrush are systematically expounded， and the factors affecting the sympathetic inrush are extracted. Second， a real-time digital simulation system is used to model the primary system of a substation， successfully reproducing the sympathetic inrush phenomenon. Simulation analysis examines the effects of switching angle， system connection resistance and load on sympathetic inrush， the yielding results are consistent with theoretical analysis. It is proposed that the effect of the sympathetic inrush can be effectively suppressed by closing the breaker at the peak voltage time， strengthening the connection with the system and increasing the load of connected transformers. Finally， corresponding anti-maloperation countermeasures are proposed to address the impact of sympathetic inrush on protection.