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- 2012-01-07 14:48:23
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Transformer fault analysis and the solution
Transformer is the electrification in the production of very common motor, the power system plays an important role, mainly to guarantee a safe, reliable operation and people's production and life use electric stability. The transformer is a kind of static electric motor, by utilizing the electromagnetic induction principle, can be a voltage of the electrical energy is converted to another voltage electric energy (usually alternating current), thereby realizing the distribution of electric energy. So we can find the stable and sustainable use of transformer is needed to guarantee, however in the daily production work, there will always be a variety of problems lead to transformer damage or can not normal use, the transformers is a kind of very common, so this paper mainly discusses about the fault are analyzed and some solutions.
For transformer short circuit phenomenon, based on the long time experience, think to basically have the following several possible reasons, and we need to put forward solutions:
1 line under bending deformation. This damage is the result of two axial pad between the conductors in the axial electromagnetic force under the action of bending moment, due to excessive permanent deformation, usually between two cake deformation is symmetrical.
2 winding or coil cake collapse. This damage is because the wire under the action of axial force, mutual extrusion or collision, causes a tilt deformation. If the conductor is original is slightly oblique, axial force to tilt increased, serious when it collapsed; wire of high aspect ratio, the more prone to collapse. End leakage magnetic field in addition to the axial component, there are radial component, a two direction of the magnetic flux leakage generated by the synthesis of electromagnetic force resulting in the conductor winding turns inward, and the outer winding turn outward.
3 by soft wire, causing short circuit withstand ability of transformer is one of the major reasons of poor. Since early this lack of understanding, or winding equipment and the difficulty of process, manufacturing plants are reluctant to use the semi-hard conducting wire or the design simply without the requirement of this respect, from the failure of the transformer look all soft wire. This is for sharing common AC contactor.
4 external short circuit accident is frequent, many short circuit current after electric power accumulation effect caused by electromagnetic line softening or internal relative displacement, resulting in insulation breakdown.
5 radial electromagnetic force so that the inner winding diameter becomes smaller, the bending is composed of two supporting ( internal stay ) conductor between bending moment is too large and permanent deformation results. If the core binding enough compaction and winding radial stay effective support, and radial electric power uniformly distributed along the circumferential direction, this deformation is symmetric, the winding is a multilateral star. However, because the core compression deformation, which supported condition are not identical, along the winding the circumferential stress is not uniform, actually often local buckling deformation formed Qu Qiao.
The 6 winding is loose, transposition or correct a climbing is mishandled, too thin, resulting in electromagnetic wire suspension. From the accident location, deformation to see more transpositions, especially of the transposed conductor transposition.
7 using ordinary transposed conductor resistance, poor mechanical strength, in short circuit withstand mechanical force is susceptible to deformation, odd lot, dew copper phenomenon. Using common transposed conductor, due to current, climbing steep transposition, the site will have a greater torque, while in the two end of the line winding cake, due to radial and axial leakage magnetic field interaction, will also have a larger torque, resulting in distortion. Yang high 500kV transformer A public winding has a total of 71 transposition, due to the use of thicker common transposed conductor, which has 66 transposition with different degree of deformation.
The information above in electrical switch factory provide for reference, www.jiandq.com 15957745520
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