15515673159
SZ11 Three-Phase Oil-Immersed Power Distribution Transformer 20 KV 1000 KVA Energy-Saving and Efficient Type
Download Product Catalogue
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 lable | voltage conbination(Kv) | no-loadcurrent(%) | loadloss(T) | no-load loss(T) | short circuit impedance(%) | ||
| (H.V.) | High-voltage tapping range | (L.V.) | ||||||
| 50 | Dyn1 1Yym0 |
35 38.5 |
士 5% ±2X2.5% |
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
FAQ
Find answers to common questions about the SZ11 20kV 1000kVA oil-immersed transformer, including OLTC voltage regulation, capacity selection, impedance, efficiency, testing and project customization.
learn more
What is the rated capacity and voltage level of this SZ11 transformer?
This SZ11 transformer has a rated capacity of **1000kVA** and is designed for **20kV-class three-phase power distribution systems**. The exact primary and secondary voltage combination should be confirmed according to the project electrical system and load requirements.
Is a 1000kVA transformer suitable for my project?
It depends on the actual load profile. Transformer sizing should consider: * Total connected load * Maximum demand * Load factor * Motor starting current * Power factor * Future expansion * Continuous and intermittent loads If you provide your load list or single-line diagram, we can help review whether **1000kVA** is the appropriate capacity.
What is an on-load tap changer and why is it useful?
An **on-load tap changer (OLTC)** allows the transformer to adjust the tap position while the transformer remains energized and supplying power. This helps compensate for fluctuations in the incoming voltage and maintain a more stable secondary voltage, making the transformer suitable for projects with higher power-quality requirements.
What tap range can be provided?
The tap range can be configured according to the project specification and system requirements. The exact number of tap positions and voltage adjustment range should be confirmed during technical design. If your project has a specified OLTC range, please include it in the RFQ or transformer datasheet.
What secondary voltage can be supplied?
The secondary voltage can be designed according to the project electrical system. Please provide the required output voltage, such as the voltage level required by your industrial, commercial, or distribution network, so that the transformer can be configured correctly.
What vector group and short-circuit impedance can be provided?
The vector group and short-circuit impedance can be designed according to the electrical system requirements. These parameters affect: * System grounding * Short-circuit current * Protection coordination * Voltage drop * Parallel operation * Load compatibility Please provide the required vector group and impedance value in your technical specification, if available.
How does the SZ11 design help reduce operating losses?
The SZ11 series is designed with improved core, winding, and structural configurations to reduce no-load and load losses compared with older transformer designs. Lower losses can help improve operating efficiency and reduce long-term electricity costs, especially for transformers operating continuously throughout the year. The final guaranteed loss values should be confirmed according to the approved technical datasheet.