Description
🔧 Key Features at a Glance
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Capacity Range: Up to 500 kVA
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Primary Voltage: 36 kV (or as specified)
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Secondary Voltage: 400V / 230V (or customized)
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Installation: Pole-mounted (lightweight tank with lifting lugs)
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Cooling Type: ONAN (Oil Natural Air Natural)
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Insulation Medium: High-grade mineral oil
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Tap Changer: Off-load tap changer ±5% or ±2.5% (5 positions)
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Design Standard: IEC 60076 / ANSI / BS
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Protection: Conservator, Buchholz relay, pressure relief device, oil level indicator
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Winding: Copper windings (aluminum option available)
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Tank Type: Hermetically sealed or conservator-type (based on spec)
✅ Why Choose This Pole-Mounted Oil Transformer?
✔️ Space-Saving & Lightweight
Optimized for pole-mounting in remote or space-limited areas — eliminates the need for substation buildings.
✔️ High Efficiency & Low Losses
Manufactured with CRGO laminated cores and copper windings to reduce no-load and load losses significantly.
✔️ Rugged Weatherproof Design
Fully sealed against rain, dust, and moisture; ideal for tropical climates and off-grid installations.
✔️ Safety First
Includes protective features like pressure release valves, oil level gauges, and optional surge arrestors.
✔️ Customizable Configuration
Various tap settings, protection schemes, and voltage levels available to match project specs.
📊 Technical Specifications
| Specification | Details |
|---|---|
| Rated Capacity | 25–500 kVA |
| Primary Voltage | 11kV / 22kV / 33kV / 36kV (customizable) |
| Secondary Voltage | 400V / 230V |
| Phase | 3-phase, 50Hz |
| Vector Group | Dyn11 (standard) |
| Cooling Method | ONAN (Natural oil & air cooled) |
| Insulation Class | Class A / B |
| Winding Material | Copper (standard) / Aluminum (optional) |
| Tap Changer | ±5% off-load (optional ±2.5%) |
| Protection Devices | Buchholz relay, pressure relief, breather |
| Standards | IEC 60076, BS 171, ANSI C57.12 |
| Installation | Pole-Mounted via galvanized brackets |
🏗️ Application Areas
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🌍 Rural Electrification Projects
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🏘️ Residential Estates & Gated Communities
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🏭 Light Industrial Loads & Agro-processing Sites
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🛠️ Construction Sites & Temporary Grids
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⚡ Off-grid Energy Distribution & Mini-grids
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🛣️ Highway & Street Lighting Systems
🔍 Comparison: Pole-Mounted vs Pad-Mounted Transformers
| Feature | Pole-Mounted Oil Transformer | Pad-Mounted Transformer |
|---|---|---|
| Installation Type | Elevated on concrete or steel poles | Ground-level, enclosed unit |
| Max Capacity (Typical) | Up to 500 kVA | Up to 2,500 kVA |
| Cooling | ONAN | ONAN or ONAF |
| Accessibility | Moderate (requires elevation access) | Easy access at ground level |
| Space Requirements | Minimal | Requires secure ground area |
| Cost Efficiency | More affordable for <500kVA loads | Higher cost but higher capacity |
🛠️ Why Source from Stema Engineering?
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✅ Pre-shipment Testing & Certification
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🔧 Custom Configurations Based on Client Specs
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🛡️ Warranty & Post-Installation Support
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🚚 Countrywide Delivery & Pole-Mount Installation Guidance
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⚙️ Accessories Available: Lightning arrestors, fuses, drop-outs
📞 Talk to Our Power Experts Today
Call Us:
📱 +254 707 122 122
📱 +254 708 122 122
Email:
📩 info@stemaengineering.com
✅ Final Thoughts
If you’re seeking a compact, durable, and efficient medium-voltage distribution solution, the Pole-Mounted Oil-Immersed Transformer (Up to 500 kVA, 36 kV) is a reliable fit. Designed to meet both rural and urban energy demands with minimal infrastructure needs, it combines affordability with world-class performance — backed by Stema Engineering’s expert support and technical reliability.
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