Intelligent detection method for transformer winding deformation based on short circuit reactance

Abstract

The invention discloses an intelligent detection method for transformer winding deformation based on short circuit reactance. The intelligent detection method comprises the following steps of step 1,line connection, step 2, numerical calculation, step 3, calculation of short-circuit impedance, step 4, control group detection and step 5, data comparison, specifically, the appropriate measurement frequency is selected to connect a transformer winding for detection to a low voltage and a low current, and a power meter, a voltmeter and an ammeter are connected to a circuit separately, so that according to the circuit relationship, a wiring diagram is manufactured; and the distribution parameters such as currents, voltages and resistance in the circuit are measured and recorded, since the value of conductance G<10> is much larger than the sum value of internal resistance R<1> and internal resistance R<12>, and the value of total reactance X<10> is much larger than the sum value of reactance X<1> and reactance X<12>, the conductance G<10> and the total reactance X<10> can be ignored during calculation. The intelligent detection method is simple in operation, and data of a measurement group is compared with data of a control group so that the condition of a transformer winding can be diagnosed through clear criteria, and the accuracy of the detection and diagnosis is greatly improved.

Description

technical field [0001] The invention relates to the technical field of transformers, in particular to an intelligent detection method for transformer winding deformation based on short-circuit reactance. Background technique [0002] When the transformer is impacted by a short-circuit fault current during operation, a large short-circuit current will flow in the transformer winding, and the short-circuit current will generate a large electromotive force under the interaction with the leakage magnetic field. At this time, each winding It will bear huge and uneven radial electromotive force and axial electromotive force; in addition, the transformer may also be subjected to unexpected collision shocks, bumps and vibrations during transportation and installation. Under the action of these electrodynamic or mechanical forces, the winding may produce mechanical displacement and deformation, and may cause serious transformer accidents such as insulation damage, winding short circu...

AI Technical Summary

Problems solved by technology

Under the action of these electrodynamic or mechanical forces, the winding may produce mechanical displacement and deformation, and may cause serious transformer accidents such as insulation damage, winding short circuit and burning; in addition, the dead zone or action failure of the protection system will cause the transformer to withstand short circuit The current acts for a long time, which is also one of the reasons for the deformation of the winding; if an accident occurs during operation of the power transformer, it may cause a large-scale power outage, and the maintenance period generally takes more than half a year, which is not only expensive, but also has a wide impact. Therefore, It is necessary to design an intelligent detection method for transformer winding deformation based on short-circuit reactance

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