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D10 D11 Pole-Mounted Transformers Series Single Phase Transformers
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D10/D11 Pole-Mounted Single Phase Transformers — Rural Electrification
D10 and D11 series pole-mounted single-phase distribution transformers use silicon-steel cores with oil-immersed, sealed-tank construction for rural electrification and single-phase distribution. Rated 5–167 kVA, primary 11/13.8/33 kV with secondary 240V (center-tapped), built to IEC 60076 with tank-mounted brackets, lifting lugs and lightning-arrestor provisions for pole installation.
Key Features
- Silicon-steel core, oil-immersed sealed-tank construction
- Single-phase 5–167 kVA, primary 11/13.8/33 kV
- Secondary 240V (center-tapped) for residential distribution
- Pole-mounting brackets, lifting lugs and arrestor provisions
- Low no-load loss D11 grade for energy saving
- Built to IEC 60076 distribution transformer requirements
Applications
- Rural electrification and single-phase distribution
- Southeast Asia and Africa single-phase networks
- Residential and light commercial feeders
- Remote and line-end voltage support
Selection Guide
Capacity
Size from the single-phase connected load and expected growth.
Primary voltage
Match 11kV, 13.8kV or 33kV to the local distribution voltage.
Loss grade
Choose D11 for lower no-load losses where energy efficiency matters.
- Frequently Asked Questions
What is a D10/D11 pole-mounted transformer?
D10 and D11 are single-phase oil-immersed distribution transformer series for pole mounting; D11 is the lower-loss grade. They serve single-phase 11/33 kV distribution networks with 240V secondary output.
What capacity range is typical?
5–167 kVA single-phase, sized to the connected single-phase load and feeder length.
Why single-phase for rural areas?
Single-phase distribution lowers first cost and line losses for low-density rural loads, common in Southeast Asian and African electrification programs.
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