Description
Power That Endures | Up to 765 kV | Up to 1,000+ MVA
📞 Contact Us Today: +254 707 122 122 | 🛒 Visit: shopstemaengineering.com
📐 Technical Specifications
| Parameter | Details |
|---|---|
| Voltage Rating | Up to 765 kV (HV) / 3.3 – 33 kV (LV typical) |
| Power Rating | 50 kVA – 1,000+ MVA |
| Frequency | 50 Hz / 60 Hz |
| Insulation | Mineral Oil / Ester-based Fluid / Silicone Fluid |
| Cooling Types | ONAN, ONAF, OFAF, OFWF |
| Winding Configuration | Dyn11, YNd1, YNyn0 or custom |
| Tapping Range | ±2×2.5% / ±4×2.5% or OLTC / NLTC |
| Efficiency | Up to 99.7% |
| Standards | IEC 60076 / ANSI / IEEE / GOST |
| Temperature Rise | 55°C or 65°C (customizable) |
| Monitoring | Smart sensors, DGA, thermal, OLTC monitoring (optional) |
🌟 Key Features
💡 Ultra-High Voltage & Capacity
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Handles up to 765 kV and 1,000+ MVA, suitable for national grid interconnections and power plants.
🔒 Enhanced Safety & Insulation
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Optional fire-retardant oil and pressure relief devices
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Compliant with IEC, ANSI, and local utility regulations
🛠 Custom-Engineered Builds
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Tailored to site-specific voltage, power, and space requirements
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Multiple cooling, protection, and control options
📊 Advanced Digital Monitoring (Optional)
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Real-time diagnostics, partial discharge tracking, oil/gas analysis
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Remote alerts for predictive maintenance
🏭 Applications
| Sector | Application |
|---|---|
| National Utility Grids | HV substation step-up/step-down transformers |
| Renewable Energy Plants | Grid integration of wind farms, solar and hydro |
| Mining & Heavy Industry | High-power drive systems, substations |
| Oil & Gas Infrastructure | Powering remote refineries, drilling platforms |
| Data Centers & Campuses | High-reliability backup and primary power distribution |
| Ports, Rail, Airports | Traction power, load balancing, and critical supply |
🆚 Comparison Table: Oil-Immersed vs Dry-Type Transformers
| Feature | Oil-Immersed Transformers | Dry-Type Transformers |
|---|---|---|
| Max Voltage | ✅ Up to 765 kV | 🔺 Up to 36 kV |
| Power Capacity | ✅ Up to 1,000+ MVA | 🔺 Up to 10,000 kVA |
| Fire Safety | ⚠️ Requires containment | ✅ Self-extinguishing insulation |
| Environment Suitability | Best for outdoor or remote use | Best for indoor/sensitive areas |
| Cooling Method | Oil (ONAN, ONAF, OFAF) | Air/Natural Convection |
| Maintenance Needs | Regular oil tests, inspections | Minimal maintenance |
| Cost Efficiency | ✅ High capacity = lower $/kVA | Higher CAPEX per kVA |
⚙️ Cooling Methods Explained
| Cooling Type | Description |
|---|---|
| ONAN | Oil Natural Air Natural – Passive cooling for smaller loads |
| ONAF | Oil Natural Air Forced – Fans enhance air circulation |
| OFAF | Oil Forced Air Forced – Pumps circulate oil; fans cool external radiators |
| OFWF | Oil Forced Water Forced – High-performance cooling with water heat exchangers |
📦 Popular Models & Lead Time
| Model / Type | Voltage Class | Power Range | Cooling Type | Lead Time |
|---|---|---|---|---|
| Schneider Trihal (Small Utility) | ≤ 36 kV | 250 kVA – 2.5 MVA | ONAN/ONAF | ✅ 4–6 weeks |
| MVA-Class Grid Transformer | 132–220 kV | 10 – 250 MVA | ONAF / OFAF | 🔄 10–14 weeks |
| EHV Transformer (Custom) | 400 – 765 kV | 100 – 1,000+ MVA | OFAF / OFWF | 🔄 16–20 weeks |
| Renewable Step-Up Units | 66 – 220 kV | 5 – 50 MVA | ONAN / ONAF | ✅ In Stock (Limited) |
📄 Standards & Certifications
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✅ IEC 60076 series
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✅ ISO 9001 / ISO 14001 / ISO 45001
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✅ ANSI / IEEE
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✅ KPLC, REA, KETRACO Compliant Models
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✅ Seismic & Environmental Certifications for global deployment
🔧 Customization Options
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Smart Monitoring Packages: DGA sensors, thermal cameras, SCADA-ready interfaces
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Special Fluids: Ester or silicone fluids for environmental or fire-sensitive areas
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Noise Reduction Enclosures for urban settings
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Skid-Mounting, Mobile Substations, and HV Bushings as per customer needs
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Integrated Protection Systems: Buchholz relay, pressure relief valves, WTI/OTI gauges
🌍 Why Choose Shop Stema Engineering?
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🇰🇪 Trusted Supplier for Kenyan Utilities, EPCs & Industrial Clients
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🤝 Direct procurement from Schneider Electric with warranty support
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🔩 Design, Delivery, Installation & Commissioning by certified engineers
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📈 Project-based pricing and long-term service contracts available
📞 Request a Quote or Consultation
Looking to power major substations, renewables, or high-voltage industrial facilities? Trust Schneider Oil-Immersed Transformers to handle the load with safety, reliability, and longevity.
📞 Call / WhatsApp: +254 707 122 122
📧 Email: info@stemaengineering.com
🛒 Buy Now or Request Quote at: www.shopstemaengineering.com
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