Transformer winding turn-to-turn short circuit vibration acceleration calculating method

Abstract

The invention relates to a transformer winding turn-to-turn short circuit vibration acceleration calculating method. The method is characterized by including steps of magnetic model adopting, circuitmodel adopting and winding vibration acceleration calculating. Practical condition limitations in short-circuit test and electrodynamic force measurement are overcome, electromagnetic characteristicsin operation of a transformer are fully considered in calculation, and transformer winding faults are accurately simulated by taking transformer head end and middle turn-to-turn short circuit faults as calculating objects. A field-circuit coupling model is adopted for effectively simulating an internal magnetic field environment in transformer winding turn-to-turn short circuit, correctness of thefield-circuit coupling model is verified by comparison of simulation results and experimental data, and accordingly the feasible method is provided for winding turn-to-turn short circuit fault identification. The method has advantages of scientificity, reasonability, realness, effectiveness, high practical value and the like.

Description

technical field [0001] The invention is a calculation method of winding inter-turn short-circuit vibration acceleration based on a three-dimensional field-circuit coupling model of a transformer, which is applied to power transformer winding vibration acceleration analysis and winding inter-turn short-circuit fault identification. Background technique [0002] The power transformer is the heart of the power system and plays an irreplaceable role in the transmission of electric energy. Its stable operation is almost directly related to the reliability of the entire power system operation, and the transformer is prone to failure due to various reasons. Turn-to-turn short circuit of transformer winding is generally caused by short circuit of turns due to insulation damage, which has the characteristics of sudden change of fault phase short circuit current, severe electromotive force and vibration, and no obvious change of non-fault phase current. It is very difficult for tradit...

AI Technical Summary

Problems solved by technology

With traditional protection, it is difficult to identify the fault state of the winding when an inter-turn short circuit occurs in the transformer. If the transformer continues to operate under load, it will lead to serious consequences such as deformation or even burning of the winding, which will affect the safe and stable operation of the equipment and even the system.

Turn-to-turn short circuit of transformer winding is an internal fault, and the differential protection has the problem of failure or refusal to operate when dealing with this fault

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