MV HV 11kV 33kV Transformers – Oil-Immersed Transformers up to 20 MVA
12-03 2025 | By:
MV (Medium Voltage) and HV (High Voltage) 11kV and 33kV oil-immersed transformers are widely used in modern power distribution, industrial networks, and renewable energy projects. ZTelec Yuguang offers S11, S13, S15, and S18 series transformers with capacities up to 20 MVA, designed for high efficiency, reliability, and long service life.
Common Applications
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Urban Power Distribution:
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Step-down from 33kV/11kV to 400V/230V for residential, commercial, and municipal grids.
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Industrial Plants:
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Supply stable power for heavy machinery, steel plants, CNC workshops, and large factories.
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Renewable Energy Integration:
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Step-up or step-down voltage for solar farms, wind turbines, and hydroelectric plants.
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Infrastructure Projects:
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Airports, metro systems, hospitals, and large commercial complexes.
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MV and HV 11kV & 33kV oil-immersed transformers (S11, S13, S15, S18 series) up to 20 MVA are ideal for urban power distribution, industrial plants, renewable energy, and large infrastructure projects.
Applications & Specifications Table:
| Series | Voltage (kV) | Capacity (kVA / MVA) | Phase | Cooling | Insulation | Applications |
|---|---|---|---|---|---|---|
| S11 | 11 / 33 | 50 – 2,000 | 3 | ONAN/ONAF | F | Urban distribution, commercial buildings |
| S13 | 11 / 33 | 100 – 4,000 | 3 | ONAN/ONAF | F/H | Factories, manufacturing |
| S15 | 11 / 33 | 500 – 8,000 | 3 | ONAN/ONAF | H | Large industry, infrastructure |
| S18 | 11 / 33 | 1,000 – 20,000 | 3 | ONAN/ONAF | H | Power plants, renewable energy |
Notes:
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ONAN / ONAF: Oil Natural / Oil Forced cooling
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Insulation F / H: Suitable for various temperature rise and environmental conditions
Key Features:
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High-capacity oil-immersed design up to 20 MVA.
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Advanced insulation and low-loss core for energy efficiency.
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Optional custom configurations for voltage levels, cooling methods, and mounting.
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Factory-direct supply ensures competitive pricing and fast delivery.
Why Choose ZTelec Yuguang?
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Proven reliability for industrial, urban, and renewable energy projects.
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Full range of MV and HV oil-immersed transformers (S11-S18 series).
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Compliance with international IEC and ANSI standards.
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Support for custom projects and on-site technical guidance.
Oil-immersed MV and HV 11kV & 33kV transformers from ZTelec Yuguang (S11, S13, S15, S18) provide high reliability, energy efficiency, and scalable capacity up to 20 MVA. Ideal for industrial, urban, and renewable energy applications, these transformers ensure stable, safe, and efficient power distribution.
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