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China Suppliers Factory SZ11 Three-Phase Oil-Immersed Power Distribution Transformer 20KV 1000KVA Energy-Efficient Type
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
Q What makes this oil-immersed transformer resistant to short-circuit faults?
The transformer uses advanced simulation software to calculate leakage magnetic fields and force fields, optimizing ampere-turn distribution and shielding measures to minimize short-circuit electromagnetic force. Windings are wound on high-stiffness hard paper tubes with "0" tolerance wire bun design, and key insulation parts are reinforced for maximum protection.
Q How does the cooling system extend the insulation lifespan of the transformer?
A full oil circuit guiding cooling structure with longitudinal oil channels and end face guiding design allows transformer oil to circulate efficiently, rapidly removing heat from windings and the core. Temperature field simulation optimizes the cooling path, reducing average temperature rise by 10K compared to traditional products, which more than doubles the insulation service life.
Q Does this transformer require regular oil maintenance or oil replacement?
No. The fully sealed bell-shaped or corrugated oil tank structure completely isolates the transformer oil from the atmosphere through corrugated sheets or diaphragm-type oil reservoirs. This prevents moisture, dust, and impurities from entering, significantly slowing oil deterioration and eliminating the need for routine oil maintenance.
Q What is the available rated capacity range for this transformer?
The transformer is available in a wide range of rated capacities from 50 KVA up to 2500 KVA, covering diverse application needs from small commercial facilities to large industrial power distribution systems.
Q What voltage combinations and tapping ranges are supported?
The transformer supports high voltage of 35 KV or 38.5 KV with a high-voltage tapping range of ±5% or ±2×2.5%, and a low voltage output of 0.4 KV. Connection group labels available are Dyn1 and Yyn0.
Q What is the short-circuit impedance of this oil-immersed transformer?
The short-circuit impedance for this series of oil-immersed transformers is 6.5% across all rated capacity levels from 50 KVA to 2500 KVA, ensuring stable and reliable performance under fault conditions.