What should be noted when assembling the transformer winding? (1)
What should be noted when assembling the transformer winding? (1)
In transformer manufacturing, the winding assembly process is of crucial importance and directly relates to the performance and operational reliability of the transformer. The following focuses on the key points in the winding assembly process.
Inhalt
1. Precise control of winding direction
The winding direction is the primary focus in winding assembly. For the windings of small and medium-sized three-phase transformers, they usually have the same winding direction to ensure that the magnetic field lines form a complete loop within the iron core and achieve normal electromagnetic conversion. If the winding direction is incorrect, the path of the magnetic field lines will be disordered, which will affect the working efficiency and performance of the transformer and may cause faults such as local overheating. For the two-column windings of single-phase transformers, especially the three iron core column windings of single-phase three-split, the winding directions of the middle column and the two side columns are opposite. This is a special design based on the characteristics of their magnetic field distribution. If the winding direction is wrong, it will cause the magnetic field within the iron core to be chaotic, resulting in the transformer being unable to work normally or a significant decrease in performance.
2. Preventing misalignment and its impacts
(1) Impact on main insulation distance:
Misalignment is strictly prohibited during winding assembly. Misalignment will cause the distance between windings to decrease on one side and increase on the other side. For the misalignment of the outer winding, it may also lead to changes in the phase-to-phase distance, directly affecting the main insulation distance. The change in the main insulation distance will weaken the insulation performance. During operation, it may be unable to withstand the voltage stress, increasing the risk of breakdown and discharge and threatening the safe operation of the transformer.
(2) Impact on winding force and concentricity:
After misalignment, the repulsive forces on both sides of the winding are unequal. The concentric windings will generate a force tending to be concentric, but it may not be able to completely correct the misalignment; the staggered windings will increase the degree of non-concentricity, further affecting the distance between the winding and the iron core, affecting the mechanical stability and causing local stress concentration and affecting the service life of the winding.
(3) Analysis of no impact on impedance voltage:
It should be noted that although misalignment of the winding has no impact on the impedance voltage (because the impedance voltage is related to the area between the windings and misalignment does not change the area), its other harms cannot be ignored.
(2)工学的な範囲:(0.3~0.5)X_L@fᵣ
In short, during the transformer winding assembly process, points such as winding direction, misalignment control, height alignment, iron core protection, and assembly method all need to be strictly controlled. Operators must have a high sense of responsibility and professional skills to ensure that each link is accurate and error-free to guarantee the quality and performance of the transformer and provide strong support for the stable operation of the power system. Any negligence may cause serious problems and must be taken seriously.
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