35kV Dry Type NLTC Transformer for New Energy

Our 35kV dry-type three-phase two-winding off-circuit tap-changing power transformers are environmentally friendly, oil-free step-up solutions for photovoltaic, wind power, and energy storage applications requiring fire safety and indoor installation.

• Dry-type epoxy resin insulation is non-flammable, explosion-proof, and pollution-free, eliminating oil leakage and fire hazards for direct indoor or space-constrained installation.

• LV side compatible with 0.4kV to 1.14kV wide output range from inverters, turbines, and storage converters; HV side covers 35kV to 38.5kV with ±2×2.5% or ±5% off-circuit taps.

• Rated from 1000 kVA to 10000 kVA with short-circuit impedance adjustable from 6.0% to 14.0% for customized system matching.

• Multiple vector groups available: Dyn11, Yd11, Yyn0, and YNd11; load loss data provided for B, F, and H insulation classes.

• Fast delivery, reliable quality, responsive service, and extensive project experience backed by our company.

Core Positioning

This product series comprises environmentally friendly, safe, and maintenance-free dry-type step-up transformers specifically designed for new energy generation-side applications such as photovoltaic (PV), wind power, and energy storage. Utilizing advanced resin insulation technology and operating completely without transformer oil, it is particularly suitable for indoor or special-environment new energy projects with stringent requirements for fire safety, environmental protection, and installation space. It serves as an ideal choice for the efficient and reliable integration of low-voltage clean energy into 35kV grids.

Technical Specifications

Rated capacity (kVA)	Rated voltage and tapping range			Vector group	No Load Current (%)	Short-circuit impedance (%)	No load Losses (kW)	On load Losses (kW)
Rated capacity (kVA)	HV	Tapping range	LV	Vector group	No Load Current (%)	Short-circuit impedance (%)	No load Losses (kW)	B (100℃)	F (120℃)	H (145℃)
1000	35	±2×2.5 ±5	0.4~1.14	Dyn11 Yd11 Yyn0	0.85	6.0~14.0	1.4	8.8	9.4	10.1
1250					0.75		1.6	10.7	11.4	12.2
1600					0.75		1.9	13.1	13.9	14.9
2000					0.65		2.2	15.4	16.4	17.5
2500					0.65		2.6	18.5	19.6	21.0
3000					0.6		3.2	20.3	21.6	23.1
3150					0.6		3.5	20.7	22.1	23.5
4000					0.6		4.1	24.9	26.5	28.2
4500					0.55		4.4	27.4	29.1	31.1
5000					0.55		4.8	29.6	31.4	33.6
6300					0.55		5.7	34.6	36.7	39.2
8000				Dyn1 Yd11 YNd11	0.45		6.9	41.7	44.3	47.3
10000				Dyn1 Yd11 YNd11	0.45		8.2	49	52.1	55.7

Core Advantages and Features

1. High Safety and Environmental Friendliness:

- Employs dry-type insulation technology such as epoxy resin casting or impregnation. It is oil-free, non-flammable, explosion-proof, and moisture-resistant, fundamentally eliminating risks associated with oil-immersed transformers like oil leakage, fire hazards, and environmental pollution. It can be installed directly indoors, in basements, or close to load centers.

- Features low noise levels and emits no harmful gases, complying with the most stringent environmental and building safety codes.

2. Precise Matching of New Energy Characteristics:

- The low-voltage side is compatible with a wide input voltage range from 0.4kV to 1.14kV, allowing direct connection to the low-voltage outputs of PV inverters, wind turbine generators, and storage converters.

- The high-voltage side covers grid-connection voltages from 35kV to 38.5kV and offers off-circuit tap-changing options of ±2×2.5% or ±5% for flexible adaptation to grid voltage fluctuations.

3. Flexible Configuration and High Performance:

- Offers multiple standard vector groups, including Dyn11, Yd11, Yyn0, and YNd11, to meet various system grounding methods, harmonic suppression, and relay protection requirements.

- Features a wide adjustable short-circuit impedance range (6.0% to 14.0%), allowing optimization based on specific project short-circuit capacity to ensure safe grid integration.

- Load loss data is provided for three different insulation thermal classes: B (100℃), F (120℃), and H (145℃), offering strong design flexibility to meet various temperature rise and overload capacity requirements.

4. High Efficiency and Reliability:

- The capacity range spans from 1000 kVA to 10000 kVA, suitable for various medium-scale centralized new energy power plants.

- Incorporates low-loss design and high-quality silicon steel, resulting in well-controlled no-load and load losses and high operational economy.

- The dry-type structure allows for easy maintenance, essentially making it maintenance-free, and offers competitive lifecycle costs.

Typical Applications

- 35kV step-up substations for new energy projects located inside buildings, underground, or with extremely high fire safety requirements, such as those supporting data centers and commercial complexes.

- Step-up transformers for onshore collector stations of offshore wind power platforms.

- 35kV grid-connection step-up units for distributed PV or energy storage power plants within urban industrial parks or technology parks.

- New energy projects near environmentally sensitive areas like nature reserves or water sources with special environmental and safety regulations.

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