卢秀和,朱加勉,宫文文.分段最小二乘拟合法在变压器测温中的应用[J].电测与仪表,2016,53(3):. LU Xiu-he,ZHU Jia-mian,GONG Wen-wen.Piecewise Least Square Fitting Used in the Temperature Measurement of Transformer[J].Electrical Measurement & Instrumentation,2016,53(3):.
分段最小二乘拟合法在变压器测温中的应用
Piecewise Least Square Fitting Used in the Temperature Measurement of Transformer
In view of a 500kVA substation of Changchun, according to the problem of platinum resistance temperature sensor Pt100 data acquisition of large error in the process temperature measurement of transformer, through the research on the nonlinear characteristic of platinum resistance, propose a negative resistance compensation method and the piecewise least square fitting method combining from the external to the sensor signal to error correction, after testing, the method can effectively improve the measurement accuracy, reduce errors, and good applicability, the compensated sensor can meet the most demanding occasions.
