变压器漏感参数识别方法研究

Research of Leakage Inductance Identification Method for Transformers

变压器漏感参数的识别可以作为变压器故障判别依据,对变压器漏感的准确识别是变压器故障判别的关键。根据回路平衡方程,提出了基于最小二乘法的单相变压器和三相变压器的漏感识别方法。并通过EMTP-ATP仿真和动模实验室的单相变压器试验验证,仿真测得漏感识别相对误差<0.2%,试验测得变压器的漏感与铭牌参数计算的漏感值相对误差3.84%。此外,还在变压器不同饱和程度和不同频率下测量了变压器的漏感值。试验结果表明,基于二乘法的变压器漏感参数识别方法能够正确识别变压器的漏感值,变压器的漏感值与其饱和程度和频率无关。

The leakage inductance identification of power transformer can be regarded as the basis of fault identification. The accuracy of leakage inductance identification is the key of transformer fault identification. Therefore, according to equivalent circuit equations, leakage identification methods of single-phase transformer and three-phase transformer based on least square method were proposed in this paper. The relative error of leakage inductance measurement using EMTP-ATP simulation is below 0.2%. Transformer experiments were conducted on a single-phase transformer, which is used in dynamic simulation laboratory. The relative error of the test results compared with the calculating results on the light of nameplate is 3.84%. In addition, leakage inductance were measured under different frequency and different saturation level. Results show that the leakage inductance of transformer can be accurately measured by leakage inductance identification method based on least square method, and the leakage inductance is not sensitive to frequency and saturation level.