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Research on Relay Contact Conversion Model Based on Nonlinear Least Square Method

The reliable switching of the AC filament conversion relay plays a decisive role in normal working of the railway signal light. Firstly, this paper analyzes contact conversion feature of the AC filament conversion relay and establishes the contact conversion model. Then, the nonlinear least square method is used to fit model parameters. Furthermore, the contact switching time is confirmed and the contact switching time is calculated accurately in accordance with the residual law. Finally, this paper compares the algorithm with the rapid calculation of AC voltage peak. Effectiveness and accuracy of the model are verified by simulation result and measured data.