Modeling and designing method of up-flow transformer for testing low-voltage circuit breaker

The invention discloses an up-flow transformer modeling and designing method for testing a low-voltage circuit breaker, belongs to the technical field of quantum secret communication, and solves the problem of how to optimize problems of an existing up-flow transformer for testing the low-voltage circuit breaker. The invention provides a new primary winding and secondary winding structure of the up-flow transformer, meanwhile, the modeling and design method considers the characteristics of constant-current output and large-current low-resistance load of the up-flow transformer during tripping test of a low-voltage circuit breaker, and core window parameters of the up-flow transformer are optimized based on a fixed window area and a Lagrange multiplier method. An equivalent magnetic circuit method is adopted to establish an iron core parameter calculation model, a field-circuit joint simulation test model is adopted to carry out a short-circuit test to test the leakage reactance of the up-flow transformer, no-