Inrush current suppression system and method for single-side power transformer

Abstract

The invention relates to an inrush current suppression system and method for a single-side power transformer, and the system comprises a power side assembly and an inrush current suppression host which are disposed at a power side, and a transformer side assembly disposed at a transformer side, wherein the power side assembly comprises a power main wiring module and a power side collection module. The transformer side assembly comprises a transformer main wiring module and a transformer side acquisition module; the power supply side acquisition module is connected with the power supply main wiring module and is used for acquiring current and voltage of a power supply side, and the transformer side acquisition module is connected with the transformer main wiring module and is used for acquiring current and voltage of a transformer side; the inrush current suppression host is in communication connection with the power supply side acquisition module and the transformer side acquisition module, obtains the induction magnetic flux and the residual magnetic flux, obtains the optimal closing phase of the transformer after data processing, and controls the power transmission circuit breaker to be closed. Compared with the prior art, the system has the advantages of being suitable for long-distance power transmission, safe, reliable, convenient, flexible, high in expansibility and the like.

Description

technical field [0001] The invention relates to the field of power transmission, in particular to a single-side power transformer suppressing surge current system and method. Background technique [0002] Before the transformer is closed, the total magnetic flux in the transformer is residual magnetism. At the moment of switching on, due to the applied voltage, a steady-state magnetic flux will inevitably be generated. Due to the flux linkage conservation principle (the total magnetic flux cannot be mutated), a transient induced magnetic flux that is opposite to the direction of the steady-state magnetic flux and equal in magnitude will be generated. The bias magnetism synthesized by the transient induced magnetic flux and the residual magnetism inside the transformer decays slowly with time in the lossy transformer. When the total magnetic flux combined by the bias magnetic flux and the steady-state flux exceeds the saturation flux, the reactance of the transformer winding...

AI Technical Summary

Problems solved by technology

However, in order to save cost in the project, if no voltage transformer is installed at the lower end of the power transmission circuit breaker in the main wiring, the existing scheme needs to collect the voltage on the low-voltage side of the transformer to obtain the residual magnetic flux

However, during long-distance power transmission, because the transformer is far away from the power transmission circuit breaker, it is impossible to directly obtain the low-voltage side voltage of the transformer, so that the existing solutions cannot completely solve the above working conditions. This solution is proposed for this situation

Images