Fabricante de equipos de distribución eléctrica
+86 17756594153
bryanthu@kebang2022.com
S11
Reliable, heavy-duty three-phase oil-immersed distribution transformer designed to step down 33 kV, 15 kV, 11 kV, or 10 kV medium-voltage supply to a stable 380 V low-voltage output. Fully compliant with IEC 60076 standards, featuring ONAN cooling, high-grade silicon steel core, and premium mineral insulating oil. Custom voltage ratios and capacities available upon request. Ideal for power distribution networks, industrial plants, mining operations, and rural electrification projects worldwide.
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Our three-phase oil-immersed transformers are engineered for dependable, long-life performance in medium-voltage to low-voltage power distribution. Whether your grid operates at 33 kV, 15 kV, 11 kV, or 10 kV, this transformer efficiently steps the voltage down to 380 V (line-to-line) for industrial, commercial, and residential loads.
Built with a grain-oriented silicon steel core, high-purity copper or aluminum windings, and premium-grade mineral insulating oil, each unit delivers low losses, low noise, and exceptional thermal stability — even in harsh tropical, desert, or high-altitude environments.
🔧 Need a different voltage ratio or capacity?
We offer full customization. Contact our engineering team with your project specifications and receive a tailored solution within 48 hours.
Multi-Voltage Primary – Choose from 33 kV / 15 kV / 11 kV / 10 kV input to match your local grid.
Standard 380 V Output – Ready for three-phase industrial and commercial loads.
Fully Customizable – Non-standard voltage ratios, capacities, frequencies (50 Hz or 60 Hz), vector groups, and accessories available.
Low Losses – Optimized core design and high-quality windings minimize no-load and load losses, reducing operating costs over the transformer's 25+ year lifespan.
Low Noise – Typically ≤ 55–65 dB depending on rating; suitable for installation near residential areas.
Robust Protection – Equipped with Buchholz relay (≥ 800 kVA), pressure relief valve, oil temperature gauge, and winding temperature gauge.
IEC / ANSI / GB Standards – Manufactured and tested per IEC 60076, with optional compliance to ANSI/IEEE C57 or local national standards.
Proven Durability – Designed for continuous 24/7 operation in ambient temperatures from –25 °C to +45 °C (special designs for extreme climates available).
Easy Installation & Maintenance – Lifting lugs, drain valve, sampling valve, and grounding terminal included.
Our S11 oil-immersed transformers are widely deployed in diverse electrical infrastructure projects worldwide:
Power distribution substations & public utility grids
Industrial manufacturing facilities & steel mills
Renewable energy integration (Solar PV plants & Wind farms)
Commercial real estate, infrastructure, and mining enterprises
| Parameter | Three-phase, oil-immersed, ONAN |
| Type | Three-phase, oil-immersed, ONAN |
| Primary Voltage (HV) | 33 kV / 15 kV / 11 kV / 10 kV (select at order)/Customized |
| Secondary Voltage (LV) | 380 V (line-to-line), 220 V (line-to-neutral)/ customized |
| Frequency | 50 Hz or 60 Hz |
| Capacity Range | 50 kVA – 3,150 kVA (larger on request) |
| Vector Group | Off-circuit ±2 × 2.5 % (HV); OLTC optional |
| No-Load Loss | Per IEC 60076-1 / local standard (see datasheet per kVA) |
| Load Loss | Per IEC 60076-1 / local standard (see datasheet per kVA) |
| Impedance Voltage | 4 % – 6 % (typical, depends on kVA) |
| Insulation Level (HV) | e.g., 33 kV → LI 170 kV / AC 70 kV (per IEC 60076-3) |
| Cooling Mode | ONAN (ONAF optional for ≥ 2,000 kVA) |
| Oil Type | Mineral insulating oil, IEC 60296 |
| Ambient Temperature | –25 °C to +40 °C (standard); –40 °C or +50 °C on request |
| Altitude | ≤ 1,000 m (standard); derating or special design for > 1,000 m |
| Noise Level | ≤ 55 – 65 dB (depending on kVA) |
| Protection Devices | Buchholz relay, pressure relief valve, oil temp. gauge, winding temp. gauge, oil level indicator |
| Standards | ISO9001 CE |
Q1: What is the difference between 33 kV, 15 kV, 11 kV, and 10 kV input options?
A: These correspond to different medium-voltage distribution standards used around the world. For example, 33 kV is common in parts of Africa and the Middle East; 15 kV and 11 kV are widely used in South America, Asia, and Europe; 10 kV is prevalent in China and some Asian grids. Select the primary voltage that matches your local utility supply.
Q2: Can you manufacture a transformer with a non-standard voltage ratio?
A: Absolutely. We regularly produce custom units such as 13.8 kV → 480 V, 20 kV → 400 V, 34.5 kV → 415 V, etc. Provide us with your required primary voltage, secondary voltage, capacity (kVA), frequency, and applicable standard, and we will design a unit specifically for your project.
Q3: What is the expected lifespan of an oil-immersed transformer?
A: With proper installation, regular maintenance (oil testing, visual inspection), and operation within rated parameters, our transformers are designed for a service life of 25 – 30+ years.
Q4: Do you provide On-Load Tap Changer (OLTC)?
A: Yes, OLTC can be supplied as an option for applications requiring voltage regulation under load. Please specify this requirement at the inquiry stage.
Q5: What tests are performed before shipment?
A: Every unit undergoes routine tests per IEC 60076, including:
Winding resistance measurement
Voltage ratio & vector group verification
Impedance voltage & load loss measurement
No-load loss & no-load current measurement
Insulation resistance & power factor (tan δ) test
Applied & induced voltage withstand test
Oil breakdown voltage (BDV) test
Type tests and special tests can be arranged upon request.
Q6: Can the transformer operate in extremely hot or cold climates?
A: Standard units are rated for –25 °C to +40 °C ambient. For desert environments (up to +50 °C) or arctic conditions (down to –40 °C), we apply special design modifications such as larger radiators, special gaskets, and low-temperature oil. Please inform us of your site conditions.
Q7: What is the warranty period?
A: (Insert your warranty terms, e.g., "24 months from the date of commissioning or 30 months from the date of shipment, whichever comes first, covering manufacturing defects.")
Q8: Do you provide installation guidance?
A: Yes. Each unit ships with a detailed Installation & Maintenance Manual. We also offer remote technical support via video call, and for large projects, on-site commissioning supervision can be arranged (subject to negotiation).
Q9: What is the minimum order quantity?
A: 1 unit. We welcome both single-unit orders and bulk project inquiries.
Q10: How do I get a quotation?
A: Please send the following details to (your email / inquiry form):
Primary (HV) voltage
Secondary (LV) voltage
Required capacity (kVA or MVA)
Frequency (50 Hz / 60 Hz)
Vector group (if known)
Applicable standard (IEC, ANSI, GB, etc.)
Ambient conditions & installation location (indoor / outdoor)
Quantity & desired delivery date
Our sales engineers will reply within 24–48 hours with a detailed technical-commercial proposal.