Oil Transformers
On-Load Tap-Changing Oil-Immersed Transformer (SZ series)
Oil-immersed transformer with an on-load tap changer for continuous voltage regulation under load. 10 / 20 / 35 kV.
Key parameters
- Rated capacity
- 200–2500 kVA
- Voltage class
- 10 kV
- Tap changing
- On-load tap changing ±4×5%
- Vector group
- Yyn0 / Dyn11
Overview
The SZ series regulates secondary voltage automatically as demand fluctuates, without disconnecting the load. It is the workhorse choice for utility feeders and industrial plants that must hold voltage within tight limits despite variable supply.
Technical parameters
| Model | Rated capacity (kVA) | No-load loss (W) | Load loss (W) | No-load current (%) | Impedance (%) | Dimensions (L×W×H, mm) |
|---|---|---|---|---|---|---|
| SZ11-200 | 200 | 340 | 2900 | 0.6 | 4 | 1450×894×1158 |
| SZ11-250 | 250 | 400 | 3420 | 0.5 | 4 | 1782×832×1195 |
| SZ11-315 | 315 | 480 | 4100 | 0.45 | 4 | 1792×852×1245 |
| SZ11-400 | 400 | 570 | 4960 | 0.4 | 4 | 1898×858×1328 |
| SZ11-500 | 500 | 680 | 5900 | 0.4 | 4 | 1943×888×1383 |
| SZ11-630 | 630 | 810 | 7200 | 0.4 | 4.5 | 2032×942×1417 |
| SZ11-800 | 800 | 980 | 8900 | 0.4 | 4.5 | 2092×1022×1492 |
| SZ11-1000 | 1000 | 1150 | 10400 | 0.3 | 4.5 | 2262×1202×1552 |
| SZ11-1250 | 1250 | 1360 | 12400 | 0.3 | 4.5 | 2382×1252×1657 |
| SZ11-1600 | 1600 | 1640 | 14800 | 0.3 | 4.5 | 2402×1292×1712 |
| SZ11-2000 | 2000 | 2150 | 18500 | 0.3 | 5.5 | 2552×1300×1850 |
| SZ11-2500 | 2500 | 2550 | 21500 | 0.2 | 5.5 | 2785×1620×1980 |
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