Analytical method of operation of large transformer with inconsistent three-phase parameters

Abstract

The invention provides an analytical method of operation of a large transformer with inconsistent three-phase parameters. The analytical method includes the following steps: carrying out analytical calculation on parameters of a large three-phase transformer set, comparing the parameters with related indexes so as to analyze possibility of operation of the transformer with the inconsistent three-phase parameters, reutilizing electromechanical-electromagnetic simulation analog computation to analyze operation condition of the transformer set in a power grid and effects on other devices, further verifying possibility of grid-connected operation of the transformer set, and lastly working out related operation types and relay protection setting value adjusting schemes according to the result of analysis and emulation to conduct operation of the transformer set. According to the method, the effect of operation of the large transformer with the inconsistent three-phase parameters on the power grid can be completely and accurately analyzed, and corresponding operation types and the setting value protection adjusting schemes can be provided, so that safety and stability of the power grid in operation of the large transformer with the inconsistent three-phase parameters are guaranteed. The method can be applied to analysis of transformer accidental replacement and transformer back-up transformer applicability, and the like.

Description

technical field [0001] The invention relates to the field of power system operation analysis, in particular to an operation analysis method for inconsistent three-phase parameters of a large transformer. Background technique [0002] As one of the most important main equipment in the power system, the transformer plays a vital role in ensuring the reliability of the grid power supply for its safe and stable operation. Ideally, the three-phase parameters of the transformer are considered to be the same, and the three-phase current should be symmetrical during normal operation; in fact, the three-phase parameters of the transformer are not exactly the same, which will produce unbalanced electrical components. However, the degree of inconsistency of the three-phase parameters of large-scale high-voltage transformers is generally small, and the unbalanced impact on the power grid can be ignored. Therefore, the current analysis of the operation of large high-voltage transformers...

AI Technical Summary

Problems solved by technology

On the one hand, this will increase the temperature of some structural parts of the transformer body, resulting in an increase in transformer loss and a decrease in load capacity; on the other hand, it will affect the normal operation of some primary and secondary equipment in the nearby power grid, resulting Stability decline, power supply quality decline, etc., in severe cases may cause forced outage of the power grid

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