单相变压器漏感参数识别计算方法研究

Research on leakage inductance parameter identification method of single phase 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 parameter identification of power transformer can be regarded as the basis of fault i- dentification. The accuracy of leakage inductance identification is the key of transformer fault identification. There- fore, according to equivalent circuit equilibrium equations, leakage identification methods of single-phase transformer based on least square method are proposed in this paper. The relative error of leakage inductance measurement through using EMTP-ATP simulation is below 0.2%. Transformer experiments are conducted on a single-phase trans- former, which is used in dynamic simulation laboratory. The relative error of the test results compared with the calcu- lating results on the light of nameplate is 3.84%. In addition, leakage inductance is measured under different fre- quency and different saturation levels. Results show that the leakage inductance of transformer can be accurately measured by leakage inductance parameter identification method based on least square method, and the leakage in- ductance is not sensitive to frequency and saturation level