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China Factory Suppliers SZ11 Three-Phase Oil-Immersed Power Distribution Transformer 20 KV 1000 KVA - Energy-Saving Solution
Product Features
High Short-Circuit Resistance and Reliable Operation Safety
Through multi-dimensional structural optimization design, the anti-short-circuit performance is enhanced. Advanced simulation software is used to accurately calculate the leakage magnetic field and force field of the windings, optimize the distribution of ampere-turns and shielding measures, and minimize the short-circuit electromagnetic force. The windings are wound using semi-hard copper wires or self-adhesive staggered wires on a high-stiffness hard paper tube. The wire buns are designed with "0" tolerance, the end wire turns are flattened and tightly bound with non-woven tape, and the insulation of key parts is strengthened.
Efficient Heat Dissipation Design, Prolongs Insulation Lifespan
The full oil circuit guiding cooling structure is adopted, with longitudinal oil channels set inside the windings, combined with the end face guiding design of the coil. This enables the transformer oil to form an efficient circulating cooling circuit, quickly removing the heat from the windings and the core. The oil tank adopts a corrugated structure or is paired with an efficient plate-type heat sink. The corrugated oil tank's corrugations can freely expand and contract with the oil temperature, enhancing the heat dissipation area and improving the sealing performance. Through temperature field simulation to optimize the cooling path, the hotspot temperature of the windings is effectively reduced. Compared with traditional products, the average temperature rise is reduced by 10K, significantly delaying the insulation aging speed, and extending the insulation life of the equipment by more than double.
Fully Sealed Structure Design, No Maintenance Required and More Convenient to Use
A fully sealed bell-shaped oil tank or corrugated oil tank structure is adopted, eliminating the traditional oil reservoir. Through corrugated sheets or diaphragm-type oil reservoirs, the volume compensation of the oil is achieved, completely isolating the transformer oil from the atmosphere. This effectively prevents moisture, dust, and impurities from entering, and slows down the deterioration rate of the oil.
Product Specifications
| Rated Capacity (KVA) | Connection Group Label | Voltage Combination (KV) | No-Load Current (%) | Load Loss (T) | No-Load Loss (T) | Short Circuit Impedance (%) | ||
| (H.V.) | High-Voltage Tapping Range | (L.V.) | ||||||
| 50 | Dyn1 / Yyn0 | 35 / 38.5 | ±5% / ±2×2.5% | 0.4 | 1.30 | 2100/1140 | 130 | 6.5 |
| 100 | 1.10 | 2010/1910 | 185 | |||||
| 125 | 1.10 | 2370/2260 | 215 | |||||
| 160 | 1.00 | 2820/2680 | 225 | |||||
| 200 | 1.00 | 3320/3160 | 270 | |||||
| 250 | 0.95 | 3950/3760 | 320 | |||||
| 315 | 0.95 | 4750/4530 | 385 | |||||
| 400 | 0.85 | 5740/5470 | 465 | |||||
| 500 | 0.85 | 6910/6580 | 545 | |||||
| 630 | 0.65 | 7860 | 665 | |||||
| 800 | 0.65 | 9400 | 785 | |||||
| 1000 | 0.65 | 11500 | 920 | |||||
| 1250 | 0.60 | 13900 | 1120 | |||||
| 1600 | 0.60 | 16600 | 1350 | |||||
| 2000 | 0.55 | 19700 | 1590 | |||||
| 2500 | 0.55 | 23200 | 1890 | |||||
Detail Pictures
Frequently Asked Questions (FAQ)
Q
What makes this oil-immersed transformer resistant to short-circuit faults?
The transformer features multi-dimensional structural optimization, including advanced simulation of leakage magnetic fields and force fields to minimize short-circuit electromagnetic forces. Windings are wound with semi-hard copper wires or self-adhesive staggered wires on high-stiffness paper tubes, with "0" tolerance wire bun design and reinforced insulation at key parts, ensuring reliable operation under short-circuit conditions.
Q
How does the cooling system extend the insulation lifespan of the transformer?
The transformer uses a full oil circuit guiding cooling structure with longitudinal oil channels inside the windings and end-face guiding coil design. This creates an efficient circulating cooling circuit that rapidly removes heat. Combined with corrugated or plate-type heat sinks and temperature field simulation, the average winding temperature rise is reduced by 10K compared to traditional products, extending insulation life by more than double.
Q
Does this transformer require regular oil maintenance or oil reservoir refilling?
No. The fully sealed bell-shaped or corrugated oil tank structure eliminates the traditional oil reservoir entirely. Volume compensation is achieved through corrugated sheets or diaphragm-type oil reservoirs, completely isolating the transformer oil from the atmosphere. This design prevents moisture, dust, and impurities from entering, requiring no routine oil maintenance.
Q
What is the available rated capacity range for this oil-immersed transformer?
The transformer is available in a wide range of rated capacities from 50 KVA up to 2500 KVA, covering various industrial and commercial power distribution requirements. Please refer to the Product Specifications table above for detailed electrical parameters corresponding to each capacity rating.
Q
What are the high-voltage and low-voltage levels supported by this transformer?
The transformer supports a high voltage (H.V.) of 35 kV or 38.5 kV with a high-voltage tapping range of ±5% or ±2×2.5%, and a low voltage (L.V.) output of 0.4 kV. The connection group labels available are Dyn1 and Yyn0, with a short-circuit impedance of 6.5%.
Q
Is this oil-immersed transformer suitable for outdoor installation?
Yes. The fully sealed structure effectively isolates the internal components from environmental factors such as moisture, dust, and airborne impurities. The corrugated oil tank design also accommodates oil volume changes due to temperature fluctuations, making it well-suited for both indoor substations and outdoor power distribution applications.