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Low Loss Solar PV Step-Up Dry Type Transformer

Designed as a low loss efficiency dry transformer for Solar PV project applications, our Low Loss Solar PV Step-Up Dry Type Transformer uses vacuum cast epoxy resin insulation and is optimized for fluctuating PV loads and inverter harmonics.

With a low-loss core, optimized winding structure, strong short-circuit resistance and oil-free flame-retardant insulation, it provides safe, efficient and low-maintenance operation for solar power systems.

Available from 50kVA to 3150kVA, with typical voltage ratios of 0.8/10.5kV and 0.8/35kV. Suitable for utility-scale solar plants, distributed PV systems and pad-mounted transformer applications, with customized specifications available for global solar EPC projects.

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Basic Info.

Our Low Loss Solar PV Step-Up Dry Type Transformer is manufactured using a vacuum epoxy resin casting process to provide reliable electrical insulation, mechanical strength and environmental resistance under demanding photovoltaic operating conditions.As a low loss efficiency dry transformer for Solar PV project applications, the unit is optimized for long-term operation under fluctuating photovoltaic loads and inverter-related harmonic conditions. A low-loss grain-oriented silicon steel core helps reduce no-load losses, while the optimized winding structure provides reliable electrical performance and strong resistance to short-circuit forces.

Depending on the capacity and voltage requirements, the winding structure can be configured with optimized foil or other suitable winding designs. The transformer can be engineered according to the specific characteristics of the PV inverter and medium-voltage collection system.Both standard dual-winding and optional double split-winding configurations are available. The split-winding version allows two independent inverter groups to be connected separately for shortcircuit current limiting and branchfault isolation inside PV pad-mounted transformer.

Performance parameters for reference

Parameter	Specification
Product Type	Low Loss Solar PV Step-Up Dry Type Transformer
Rated Capacity	50–3150 kVA or customized
Main Models	SCB13, SCB14, SCB18
Typical Voltage Ratio	0.8/10.5 kV, 0.8/35 kV
Frequency	50/60 Hz
Cooling Method	AN / AF
Insulation Technology	Vacuum Cast Epoxy Resin
Protection Class	IP20 Standard / IP54 Optional
Application	Solar PV Power Plants and Distributed PV Systems
Applicable Standards	GB/T / IEC 60076 / IEEE

Solar PV Transformer Working Principle

A Solar PV Step-Up Dry Type Transformer is installed between the PV inverter and the medium-voltage power collection or grid connection system.

The typical power flow is:

Solar Panels → PV Inverter → Low-Voltage AC → PV Step-Up Transformer → Medium-Voltage Collection System → Utility Grid

Solar panels generate DC electricity, which is converted into AC electricity by the PV inverter. The inverter normally outputs low-voltage AC power, such as 0.8kV.

The PV step-up transformer increases this voltage to a medium-voltage level such as 10.5kV or 35kV, allowing electricity to be collected and transmitted more efficiently within the solar power plant.

Because PV inverter output varies with solar irradiance and may contain harmonic components, the transformer needs to operate reliably under changing loads. The optimized winding and magnetic core design helps the transformer maintain stable performance under these operating conditions.

Key Features

1. Optimized for Solar PV Operating Conditions

The transformer is designed around the fluctuating output characteristics of photovoltaic power generation. Its winding and electrical design can be optimized for inverter-related harmonic loads, short-time overloads and changing PV operating conditions.

2. Low-Loss and High-Efficiency Design

A low-loss grain-oriented silicon steel core and optimized winding structure help reduce no-load and load losses. This improves operating efficiency and helps reduce energy losses over the service life of the solar power plant.

3. Cast Resin Insulation and Oil-Free Safety

Vacuum cast epoxy resin insulation provides flame-retardant, moisture-resistant and mechanically stable performance. The oil-free design eliminates oil leakage risks and reduces fire hazards, making it suitable for solar installations where operational safety is critical.

4. Strong Short-Circuit Resistance

The winding structure is mechanically reinforced to withstand short-circuit forces and electromagnetic stress, supporting reliable operation under demanding PV system conditions.

5. Flexible Protection and Environmental Options

The standard IP20 configuration is suitable for indoor applications or installation inside a suitable pad-mounted transformer enclosure.

For independent outdoor applications, IP54 enclosure protection is available. Customized anti-corrosion coatings can also be specified for coastal, humid, dusty or industrial environments.

6. Multi-Standard Project Support

The transformer can be designed and manufactured according to applicable GB/T, IEC 60076 and IEEE requirements based on target market and project specifications.

Application scenarios

Utility-Scale Ground-Mounted Solar Power Plants

Designed for large-scale photovoltaic power generation projects, the transformer can be used for LV-to-MV voltage step-up and medium-voltage power collection systems.

Commercial and Industrial Rooftop PV Systems

Suitable for commercial and industrial distributed photovoltaic projects where compact, safe and low-maintenance transformer solutions are required.

Why Choose Our Solar PV Dry Transformer?

PV Working Condition Optimization

Our transformer is designed according to the operating characteristics of solar power generation. The winding and insulation system can be optimized for inverter harmonics, fluctuating irradiance and short-time overload conditions.

High Efficiency and Low Operating Loss

The low-loss magnetic core and optimized winding structure help reduce transformer losses during long-term operation, supporting improved overall energy efficiency for solar power projects.

Safe and Low Maintenance

The cast resin insulation system is oil-free, flame-retardant, moisture-resistant and dust-resistant. No transformer oil maintenance is required, helping reduce long-term maintenance requirements.

Flexible Engineering Configuration

Rated capacity, voltage ratio, impedance, vector group, tap positions, cooling method, protection class and environmental protection solutions can be customized according to the PV system design.

FAQ

Q1: What is a Solar PV Step-Up Dry Type Transformer?

A Solar PV Step-Up Dry Type Transformer is used to increase the low-voltage AC output of a solar PV inverter to a medium-voltage level for power collection or grid connection.

Typical configurations include 0.8/10.5kV and 0.8/35kV.

Q2: Is this transformer different from an ordinary distribution dry transformer?

Yes. Although both products may use cast resin insulation and have a similar external appearance, a PV transformer is configured according to the operating characteristics of solar power systems.

The winding design, voltage ratio, impedance, thermal performance and other parameters can be optimized for PV inverter operation and fluctuating solar loads.

Q3: Can this dry transformer be installed inside a pad-mounted transformer?

Yes. The transformer can be designed as an internal step-up unit for a pad-mounted transformer according to the required dimensions, capacity, voltage ratio, cooling method and protection requirements.

Looking for a Low Loss Solar PV Step-Up Dry Type Transformer for your solar power plant or EPC project?

Send us your project requirements, including capacity, voltage ratio, installation environment and applicable standard.

OEM / ODM customization is available for overseas solar EPC contractors, electrical contractors, distributors and system integrators.

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