10kV oil-immersed distribution transformer
The transformer uses high-conductivity, high-quality silicon steel sheets. The core structure adopts a step-lap and binding structure with internationally advanced technology, making the electric field distribution of the core joints more uniform. Compared with the commonly used full 45° inclined joint, the no-load loss is reduced by 5-10%.
Keywords
10kV oil-immersed distribution transformer
Classification
Product details
10kV oil-immersed distribution transformer
Product Technical Features
Company Production Technology Features: Three Low, One High, One None
Fully sealed and maintenance-free, low loss, low noise, low temperature rise, high short-circuit withstand capability, no leakage, safe and reliable operation.
Process Overview:
1. “Three Low”: Low loss, low noise, low temperature rise
1. Low Loss
The transformer uses high-conductivity, high-quality silicon steel sheets. The core structure adopts a step-lap and binding structure with internationally advanced technology, making the electric field distribution of the core joints more uniform. Compared with the commonly used 45° inclined joints, the no-load loss is reduced by 5-10%.
2. Low Noise: Due to the adoption of a step-lap core structure, the magnetic reluctance is small, resulting in a significant reduction in noise generated by core hysteresis shrinkage. The noise level of the transformer is reduced by an average of 5dB compared to the national standard.
3. Low Temperature Rise: To improve product operational reliability and extend service life, our company has adopted the following measures in the temperature rise design of the product:
a. Add winding auxiliary oil passages;
b. Use cylindrical coils to reduce leakage magnetic flux at the winding ends;
c. Increase the heat dissipation area.
Through the above measures, the average temperature rise of the transformers produced by our company is reduced by 5K compared to the national standard, i.e.:
Winding temperature rise - 60K
Top layer oil temperature rise - 50K
Oil tank and structural parts surface - 75K
2. “One High”: High short-circuit withstand capability
To improve the operational safety and reliability of the transformer, our company will adopt the following new process measures in the manufacturing process of the equipment in this bid:
a. High and low voltage windings adopt a cylindrical structure, making the winding ends transition smoothly. Coupled with the use of an integral pressure plate for tightening, the axial mechanical strength of the winding is enhanced;
b. High and low voltage windings adopt the domestically leading level of high and low voltage concentric winding, with tight winding and no gaps between sets, improving the short-circuit withstand capability; interlayer insulation uses double-sided grid paper, improving insulation strength. After vacuum treatment, the grid points are solidified with glue, bonding layers together. Insulation parts are made of laminated wood, increasing clamping strength. The inner layer of the low-voltage winding of the transformer uses a 5mm formed insulating paper tube.
3. “One None”: No oil leakage from the tank
The transformer oil tank adopts a barrel-type, core-free structure. The oil tank is a corrugated oil tank formed from cold-rolled thin plates or equipped with plate-type radiators, increasing the heat dissipation area and improving the heat dissipation coefficient and lowering the temperature rise. All welding of the oil tank uses carbon dioxide gas shielded welding, and during the welding process, the internationally advanced fluorescence permeation method is used to detect the welds; after the oil tank is formed, it undergoes a 25kp, 12-hour water pressure leak test and a 20kp, 12-hour oil pressure leak test. Finally, the entire surface of the oil tank undergoes thermal spraying treatment, ensuring not only that the oil tank is leak-proof but also that it has a beautiful appearance and strong corrosion and aging resistance.
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