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What are the Reasons for the Formation of Oil-Immersed Transformer Faults?

From the anatomical transformation in recent years, the … Continue reading What are the Reasons for the Formation of Oil-Immersed Transformer Faults?

From the anatomical transformation in recent years, the electromagnetic wire selected according to the static theory of the oil-immersed transformer has a large difference from the stress acting on the electromagnetic wire during the practical operation.

1. The winding of the winding is loose, the displacement is not properly handled, too thin, and the electromagnetic wire is suspended. In terms of the orientation of the end damage, the deformation is often seen at the position of the change, especially the transposition of the transposed conductor.

2. At present, the accounting order of each manufacturer is based on an idealized model such as the uniform distribution of the leakage magnetic field, the same diameter of the coil, and the force of the isophase. In fact, the leakage magnetic field of the ZTELEC GROUP oil-immersed transformer is not Evenly distributed, the iron yokes are partially concentrated, and the mechanical force of the electromagnetic wire in this area is also large; the transposition wire changes the direction of power transmission due to the climbing position, and the torque is attacked; The factor of the quantity, the axial blocks are not equally spaced, which will delay the resonance of the alternating force of the alternating leakage magnetic field, which is why it is in the core yoke, the transposition, and the corresponding part of the voltage regulation tap. The root cause of the primary deformation of the line pie.

3. The pre-tightening of the windings is not properly controlled to form the wires of the ordinary transposition conductors that are misaligned with each other.

4. Anti-short circuit can be calculated without thinking about the effect of temperature on the bending and tensile strength of the electromagnetic wire. According to the experimental results, the temperature of the electromagnetic wire has a great influence on the flexion limit. According to the experimental results, the bending, tensile strength and elongation of the magnet wire fall. The flexural tensile strength at 250 ° C is lower than that at 50 ° C, and the elongation is more than 40%. In practice, the ZTELEC GROUP oil-immersed transformer has an average winding temperature of 105 °C and a hottest temperature of 118 °C under additional load. Ordinary oil-immersed transformers have a reclosing process when they are running. Therefore, if the short-circuit point cannot be seen at a time, it will receive the second short-circuit shock in a very short time (0.8s), but it is affected by the first short-circuit current. After that, the winding temperature rises sharply, and the short-circuit resistance of the winding can be greatly dropped. This is why the short-circuiting of the oil-immersed transformer after the reclosing is mostly.

The short circuit phenomenon of ZTELEC GROUP oil-immersed transformer is very common, but the short circuit phenomenon is not terrible. The terrible thing is that there is a short circuit. I don’t know what the reason is. I don’t know how to solve it is the most terrible, so ZTELEC GROUP oil immersion The process of solving the transformer must be carefully understood!

ZTELEC GROUP Electrical Material Manufacturing Co., Ltd. is a professional manufacturer of transformers ZTELEC GROUP transformer factory. It has professional production equipment, lifting, tooling and testing equipment, and has established a perfect quality management system. The performance indicators of the products have reached the standard. . Our company relies on high-quality products, thoughtful and meticulous service, and has won the trust of our customers.

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