6-35kV Oil Immersed Transformer
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Oil-lmmersed Power Transformer
Email：info@byttransformer.com
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6-35kV Oil-immersed Power Transformer
Overview
Our 6-35kV oil-immersed power transformer series is designed for reliable, efficient power distribution in utility, industrial, and renewable energy applications. Covering a wide voltage range from 6kV up to 35kV, these transformers are fully customizable to meet your specific project requirements – whether you need a standard distribution unit or a special impedance/rectifier design.
Key Features
Wide voltage coverage – Available in voltage classes: 6kV, 10kV, 11kV, 13.2kV, 13.8kV, 15kV, 20kV, 22kV, 24kV, 30kV, 33kV, and 35kV.
Customizable capacity – From 30kVA up to 20,000kVA (20MVA).
Loss levels – Standard, medium, low, and ultra‑low losses (meeting or exceeding IEC 60076 and EU Eco Design Tier 2 requirements). Ultra‑low loss units can adopt amorphous alloy cores.
Tap changers – Off‑circuit (NLTC) or on‑load (OLTC), providing precise voltage regulation.
Cooling methods – ONAN (natural) or ONAF (forced air), adaptable to site conditions.
Robust construction – Conservator or hermetically sealed tanks with fin‑type radiators, suitable for outdoor installation in harsh environments (ambient temperature from -40°C to +55°C, altitude up to 4000m).
Standards compliance – Designed and tested according to IEC 60076, with optional compliance to GB, NBR, or other national standards.
Quality Assurance
Every transformer undergoes routine tests in our own laboratory. We also offer witness tests and can arrange third‑party inspection at accredited laboratories upon request. Our factory holds ISO 9001, ISO 14001, and CE certifications.
Typical Applications
Power distribution – Substations, rural grids, industrial parks, commercial complexes (with transformer installed outdoors or in dedicated fire‑proof transformer rooms).
Renewable energy – Solar and wind power plants requiring medium‑voltage step‑up (e.g., 0.4/6‑35kV).
Industrial – Mines, cement plants, oil & gas facilities, and other heavy industries where oil‑immersed transformers are permitted.
Infrastructure – Railways, ports, pumping stations, and irrigation projects.
⚠️ Important note
Oil‑immersed transformers contain mineral oil. For indoor installations in high‑rise buildings, subways, airports, or other densely populated spaces, please refer to our dry‑type transformer series .
Why Choose KAIBEITE?
15+ years of manufacturing experience.
Full customization – Voltage, capacity, loss level, winding material, accessories.
Global track record – Exported to more than 20 countries including Ethiopia, Tanzania, Russia, Brazil, and the Philippines.
Fast delivery – Standard lead time 15‑30 working days after order confirmation.
Responsive support – Technical assistance, installation guidance, and warranty service.
Technical Parameters (example)
Parameter Value Range
Rated power 30 – 2500 kVA (distribution); up to 20000 kVA (OLTC)
HV voltage 6 – 35 kV
LV voltage 0.2 – 1.1 kV (customizable)
Vector group Dyn11, Yyn0, YNd11, etc.
Tapping range ±2×2.5% (NLTC) or ±8×1.25% (OLTC)
Insulation level HV: 45/60/70/85/95 kV (lightning impulse 105/125/170/200 kV)
No‑load loss IEC standard or better
Load loss IEC standard or better
|
Capacity(KVA) |
No-load Loss(W) |
Load Loss |
Impedance Voltage(%) |
No-load Current(%) |
Vector Group | Extend Connection | |
| Dyn11/Yzn11 | Yyno | ||||||
| 30 | 100 | 600 | 630 | 4.0 | 2.1 | Yyn0 OR Dyn11 |
±2*2.5% Or±5% |
| 50 | 130 | 870 | 910 | 2 | |||
| 63 | 150 | 1090 | 1040 | 1.9 | |||
| 80 | 180 | 1310 | 1250 | 1.8 | |||
| 100 | 200 | 1580 | 1500 | 1.6 | |||
| 125 | 240 | 1890 | 1800 | 1.5 | |||
| 160 | 280 | 2310 | 2200 | 1.4 | |||
| 200 | 340 | 2730 | 2600 | 1.3 | |||
| 250 | 400 | 3200 | 3050 | 1.2 | |||
| 315 | 480 | 3830 | 3650 | 1.1 | |||
| 400 | 570 | 4520 | 4300 | 1.0 | |||
| 500 | 680 | 5410 | 5150 | 1 | |||
| 630 | 810 | 6200 | 4.5 | 0.9 | |||
| 800 | 980 | 7500 | 0.8 | ||||
| 1000 | 1150 | 10300 | 0.7 | ||||
| 1250 | 1360 | 12000 | 0.6 | ||||
| 1600 | 1640 | 14500 | 0.6 | ||||
| 2000 | 1940 | 18300 | 5.0 | ||||
| 2500 | 2290 | 21200 | |||||
| S11 35kv Three-phase Dual-winding No-load Voltage Regulation Transformer spec | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Rated Capacity (KVA) | Voltage Combination | Connection Group Symbol | No-load Loss (W) | Load Loss (W) | No-load Current (%) | Impedance Voltage (%) | L*W*H(mm) | Active parts Weight (kg) * Oil Weight (kg) | Total Weight (kg) | ||
| High Voltage (KV) | Tapping Range of High Voltage | Low Voltage (KV) | |||||||||
| 630 | 35 | ±2×2.5% 士5% | 3.15 6.3 10.5 | Ydl1 | 830 | 7860 | 0.65 | 6.5 | 2400*1700*221 | 2210*900 | 3250 |
| 800 | 980 | 9400 | 0.65 | 2500*1850*239 | 2350*1030 | 3500 | |||||
| 1000 | 1150 | 11500 | 0.65 | 2700*1950*251 | 2490*1180 | 3860 | |||||
| 1250 | 1400 | 13900 | 0.55 | 2900*2050*263 | 2600*1350 | 4350 | |||||
| 1600 | 1690 | 16600 | 0.45 | 3050*2130*275 | 2810*1580 | 4855 | |||||
| 2000 | 2170 | 18300 | 0.45 | 3105*2195*280 | 2800*1800 | 5300 | |||||
| 2500 | 2560 | 19600 | 0.45 | 3150*2535*298 | 3525*2060 | 7665 | |||||
| 3150 | 35-38.5 | ±2×2.5% 土5% | 3.15 6.3 10.5 | 3040 | 23000 | 0.45 | 7 | 3920*2725*284 | 3950*2205 | 8565 | |
| 4000 | 3610 | 27300 | 0.45 | 3310*2915*307 | 4825*2560 | 10115 | |||||
| 5000 | 4320 | 31300 | 0.45 | 3480*3020*314 | 5700*2635 | 11305 | |||||
| 6300 | 5240 | 35000 | 0.45 | 8 | 3590*2905*321 | 7120*3240 | 13510 | ||||
| 8000 | 35-38.5 | ±2×2.5% | 3.15 3.3 6.3 6.6 10.5 | Ynd11 | 7200 | 38400 | 0.35 | 4070*3050*359 | 8875*3840 | 16690 | |
| 10000 | 8700 | 45300 | 0.35 | 4106*2795*365 | 10305*3600 | 17690 | |||||
| 12500 | 1000 | 53800 | 0.3 | 4570*3010*384 | 12830*4310 | 20990 | |||||
| 16000 | 1210 | 65800 | 0.3 | 5235*3295*461 | 16010*6650 | 27660 | |||||
| 20000 | 1440 | 79500 | 0.3 | 5360*3415*466 | 18820*7600 | 32170 | |||||
| 25000 | 1700 | 94000 | 0.25 | 10 | 5830*3810*486 | 22360*9800 | 42600 | ||||
| 31500 | 2020 | 112000 | 0.25 | 6290*4290*526 | 25110*12010 | 49960 | |||||
| S11 35kv No-load Voltage Regulation Transformer Spec | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Rated Capacity (KVA) | Voltage Combination | No-load Loss (W) | Load Loss (W) | Impedance Voltage(%) | No-load Current (%) | L*W*H(mm) | Active parts Weight (kg) Oil Weight (kg) | Total Weight (kg) | ||
| High Voltage (KV) | Tapping Range of High Voltage | Low Voltage (KV) | ||||||||
| 50 | 35 38.5 | ±5% ±2×2.5% | 0.4 | 160 | 1200/1140 | 6.5 | 1.3 | 1195*935*1825 | 300*330 | 860 |
| 100 | 230 | 2010/1910 | 1.1 | 1200*995*1935 | 470*383 | 1130 | ||||
| 125 | 270 | 2370/2260 | 1.1 | 1235*940*1955 | 550*465 | 1335 | ||||
| 160 | 280 | 2820/2680 | 1 | 1285*895*1950 | 580*485 | 1475 | ||||
| 200 | 340 | 3320/3160 | 1 | 1310*1150*1985 | 680*595 | 1755 | ||||
| 250 | 400 | 3950/3760 | 0.95 | 1450*1090*2010 | 860*650 | 2000 | ||||
| 315 | 480 | 4750/4530 | 0.95 | 1930*1065*2320 | 980*765 | 2290 | ||||
| 400 | 580 | 5740/5470 | 0.85 | 1850*1165*2015 | 1170*885 | 2725 | ||||
| 500 | 680 | 6910/6580 | 0.85 | 2045*1205*2415 | 1340*960 | 3090 | ||||
| 630 | 830 | 7860 | 0.65 | 2085*1240*2515 | 1550*895 | 3810 | ||||
| 800 | 980 | 9400 | 0.65 | 2305*1615*2685 | 1990*1030 | 4510 | ||||
| 1000 | 1150 | 11500 | 0.65 | 2545*1540*2590 | 2415*1475 | 5055 | ||||
| 1250 | 1400 | 13900 | 0.6 | 2495*2010*2675 | 2480*1405 | 5290 | ||||
| 1600 | 1690 | 16600 | 0.6 | 2680*2100*2770 | 2600*1490 | 5450 | ||||
| 2000 | 1990 | 19700 | 0.55 | 2790*2180*2860 | 2720*1590 | 5600 | ||||
| 2500 | 2360 | 23200 | 0.55 | 2900*2290*2980 | 2830*1720 | 5760 | ||||
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