基于绕组电容量和短路阻抗的变压器绕组变形分析方法

Analysis Method for Transformer Winding Deformation Based on Winding Capacitance and Short － circuit Impedance

摘要:

某 110 kV 变电站 2 号主变压器进行短路承受能力试验后，变压器短路阻抗出现严重偏差。为了准确判断试 验变压器的状态，查明试验不合格原因，通过对变压器绕组电容量和短路阻抗进行数学模型分析，提出了一种基于绕 组电容量和短路阻抗试验的绕组变形分析的 Cx － Xk ( % ) 法，为变压器返厂检修提供依据。该方法在只有单一阻抗 试验数据的情况下，结合绕组电容量的变化情况，分析出变形绕组。变压器返厂解体检查结果验证了所提出分析方 法的可行性和正确性，为变压器试验结果分析提供了一种有效的分析方法。

Abstract:

There is a serious deviation of transformer short － circuit impedance after the short － circuit endurance test of transformer No． 2 in a 110 kV substation． In order to accurately judge the state of the test transformer and find out the reasons for the unqualified test，a winding deformation analysis method———Cx － Xk (% )based on winding capacitance and short － circuit impedance test is proposed through the mathematical model analysis of transformer winding capacitance and short － circuit impedance，which provides a basis for transformer repairing． With only single impedance test data，the deformed winding is analyzed in combination with the change of winding capacitance． The results of decomposition inspection of transformer which is returned to factory verify the feasibility and correctness of the proposed analysis method，which provides an effective analysis method for the analysis of transformer test results．