Dry Type Substation Transformer

Henan GNEE Electric Co., Ltd. is one of the most reliable manufacturers and suppliers of dry type substation transformer in China. If you're going to buy customized dry type substation transformer made in China, welcome to get quotation from our factory. Quality products and reasonable price are available.

A dry type substation transformer is a power transformer that uses air or gas as the cooling and insulating medium for its windings and core instead of any liquid, with epoxy resin or polyester resin providing solid insulation. Because it contains no oil, it is inherently fire-resistant, explosion-proof and non-polluting, making it the preferred choice for indoor and outdoor unit substations in densely populated or environmentally sensitive areas.

GNEE Electric (Henan GNEE Electric Co., Ltd.) designs and manufactures SC18 / SCB18 series dry type substation transformers from 30 kVA to 2500 kVA. Each unit is custom-built around your primary voltage, vector group and loss requirements, factory-tested before shipment, and backed by full technical documentation. Request a quotation and receive a tailored technical proposal within 24 hours.

A dry type substation transformer is a unit-substation-grade transformer that performs the same voltage transformation and distribution duties as an oil-immersed unit, but with a fully solid insulation system:

• No liquid dielectric – windings and core are cooled and insulated by air or by vacuum-cast epoxy resin.
• Self-extinguishing – in the event of an internal fault, the insulation does not propagate flame and produces no toxic gas.
• Direct indoor placement – no oil pit, fire wall, containment basin or sprinkler system is required, so the unit can be sited close to the load center.

These characteristics make the dry type substation transformer ideal for primary and secondary unit substations in commercial buildings, industrial plants, hospitals, data centers and urban distribution networks.

The table below lists the standard SC18 / SCB18 series ratings. No-load and load losses are stated at the reference temperature of 120 °C (Class F insulation) in accordance with IEC 60076-11 / GB/T 10228.

Note: Higher voltage ratings (up to 35 kV), other vector groups (e.g. Dyn5, Dyn1) and lower-loss designs are available on request. Values in the table are standard series figures; the factory test report issued with each unit is the governing document.

Dry Type Substation Transformer

Custom-engineered to your load profile – unit substation solutions are configured around your exact primary voltage, vector group, tapping range and enclosure requirements.

Computer-aided electrical and mechanical design – core and winding geometry is optimized for your load and fault conditions, giving high short-circuit strength and low losses.

Environmentally friendly insulation system – multiple coating and encapsulation options protect the core and windings against moisture, salt fog and dust.

Low maintenance, long service life – no oil to test or replace; low thermal and dielectric stress on insulation extends operating life.

Quiet, stable operation – rigid construction and optimized core design minimize vibration, noise and harmonic-induced heating.

A dry type substation transformer delivers measurable advantages over oil-immersed alternatives:

• Safe for people and property – contains no flammable or toxic liquid that could leak, spill or ignite.
• Essentially maintenance-free – no oil changes, oil tests, spill cleanup or special disposal procedures.
• Easy installation – no vault, oil containment pit or special foundation; can be placed close to the load, shortening low-voltage cable runs and reducing installed cost.
• Environmentally friendly – emits no harmful gases during operation and does not contribute to greenhouse effects.
• Strong overload capacity – superior heat dissipation and thermal endurance compared with liquid-filled units.
• Lower civil and fire-protection cost – eliminates oil pits, fire walls, extinguishers and sprinkler requirements.
• Seismic-resistant – rigid structure withstands vibration and shock, performing excellently during seismic events.
• Drastically reduced fire hazard – self-extinguishing insulation produces no smoke or flame propagation in the event of a fault.
• High short-circuit withstand – low impedance combined with high mechanical strength resists short-circuit forces.
• Long service life – high-grade insulation materials withstand elevated temperatures without premature degradation.
• Suitable for damp and contaminated areas – high moisture-ingress protection and corrosion-resistant construction.

Tip: For projects where the transformer must be located inside a building with strict fire codes – high-rise towers, hospitals, schools, metro stations – a dry type substation transformer is usually the lowest total-cost solution once civil works and fire-protection systems are compared.

The dry type substation transformer is suited to primary and secondary unit substations in:

• Commercial high-rise and mixed-use buildings
• Industrial plants and manufacturing facilities
• Hospitals, schools and public infrastructure
• Data centers and telecommunication hubs
• Renewable energy plants and auxiliary power systems
• Urban distribution networks with strict fire and environmental requirements

• GNEE Electric operates under ISO 9001, ISO 14001, ISO 45001 and SA8000 certified management systems.
• Dry-type transformers and related products hold IEC, CE and other destination-market certifications applicable to each order.
• Every unit undergoes routine factory tests – turns ratio, insulation resistance, no-load loss, load loss, and withstand voltage – per IEC 60076 / GB/T 10228 before dispatch, with complete test reports delivered with the equipment.
• GNEE products have been supplied to customers in more than 50 countries and regions worldwide.

Request A Quote

Send us your rated capacity, primary/secondary voltages, vector group, frequency, altitude and destination country. Our engineers will reply within 24 hours with a factory-direct quotation, technical datasheet and delivery schedule.

📧 Email: sales@gneeelectric.com ｜ 💬 WhatsApp: +86 158 2468 7445

Q1: What is the difference between a dry type substation transformer and an oil-immersed transformer?

A dry type substation transformer uses air or solid resin insulation instead of insulating oil, so it eliminates fire, leakage and oil-maintenance risks. Oil-immersed transformers generally have lower first cost at very large ratings, while dry type units are preferred where fire safety, indoor placement and low maintenance dominate.

Q2: Which vector group should I choose – Dyn11 or Yyn0?

Dyn11 is common for three-phase four-wire distribution with unbalanced loads; Yyn0 suits applications where a neutral is required on both sides. Our engineers will confirm the correct vector group for your system during quotation.

Q3: Can the dry type substation transformer be used outdoors?

Yes. With an appropriate IP-rated enclosure (IP23–IP54) and tropicalized coating, the transformer can be installed outdoors without a separate transformer room.

Q4: What is the difference between SC and SCB series models?

SC models are the standard cast-resin dry type series; SCB models are the foil-wound low-voltage cast-resin series, which generally offers improved short-circuit strength and is preferred for higher ratings.

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