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Energy-Efficient SZ11 Three-Phase Oil-Immersed Power Distribution Transformer 20 KV 1000 KVA - China Suppliers & Factory
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
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 is the rated capacity range of this oil-immersed transformer?
This oil-immersed transformer is available in a wide range of rated capacities, from 50 KVA up to 2500 KVA, making it suitable for various power distribution applications in industrial and commercial settings.
Q
What high-voltage and low-voltage combinations does this transformer support?
The transformer supports high voltage levels of 35 KV and 38.5 KV with a high-voltage tapping range of ±5% or ±2×2.5%, and a standard low voltage output of 0.4 KV, covering most distribution network requirements.
Q
How does the fully sealed structure benefit long-term operation?
The fully sealed bell-shaped or corrugated oil tank design completely isolates transformer oil from the atmosphere, preventing moisture, dust, and impurities from entering. This significantly slows oil deterioration and eliminates the need for routine oil maintenance, reducing operational costs over the equipment's lifetime.
Q
How does the heat dissipation system extend insulation lifespan?
By using a full oil circuit guiding cooling structure with longitudinal oil channels and temperature field simulation optimization, the hotspot temperature of windings is effectively reduced. Compared to traditional products, the average temperature rise is reduced by 10K, which more than doubles the insulation service life of the equipment.
Q
What short-circuit impedance value does this transformer have?
Across all capacity ratings from 50 KVA to 2500 KVA, this transformer maintains a consistent short-circuit impedance of 6.5%, ensuring stable and predictable performance under fault conditions and meeting standard grid protection requirements.
Q
What winding materials and techniques are used to enhance short-circuit resistance?
The windings are wound using semi-hard copper wires or self-adhesive staggered wires on high-stiffness hard paper tubes. The wire buns are designed with "0" tolerance, end wire turns are flattened and tightly bound with non-woven tape, and insulation is strengthened at all key parts — together providing superior resistance to short-circuit electromagnetic forces.