10kV Dry Type NLTC Transformer for New Energy

Our 10kV dry-type three-phase two-winding off-circuit tap-changing transformers are specifically engineered for photovoltaic, wind power, and energy storage applications requiring high reliability and environmental adaptability.

• Dry-type epoxy insulation is fire-resistant, moisture-proof, and maintenance-free, capable of withstanding harsh environments including high altitude, coastal salt fog, and desert sandstorms.

• LV side compatible with 0.4kV to 1.14kV wide output range from inverters, turbines, and storage converters; HV side covers 10kV to 12kV with ±5% or ±2×2.5% off-circuit taps.

• Rated from 500 kVA to 3150 kVA with no-load current as low as 0.5% for reduced auxiliary consumption and improved system efficiency.

• Short-circuit impedance adjustable from 4.0% to 10.0% for customized system matching; Dyn11 or Yyn0 vector groups available.

• Load loss data provided for B, F, and H insulation classes; strong short-circuit withstand and overload performance.

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

Product Overview

This series comprises 10kV dry-type three-phase two-winding off-circuit tap-changing (NLTC) transformers, specifically engineered and optimized for new energy applications including photovoltaic (PV) power generation, wind power generation, and energy storage systems. Featuring a fully dry-type insulation construction, the products offer high reliability, robust environmental adaptability, fire and moisture resistance, and maintenance-free operation. Designed to withstand the complex and variable operating conditions on the generation side of new energy systems, they serve as critical equipment for the efficient and safe grid integration of new energy power plants.

Technical Specifications

Rated capacity (kVA)	Rated voltage and tapping range			Vector group	No Load Current (%)	Short-circuit impedance (%)	No load Losses (W)	On load Losses (W)
Rated capacity (kVA)	HV	Tapping range	LV	Vector group	No Load Current (%)	Short-circuit impedance (%)	No load Losses (W)	B (100℃)	F (120℃)	H (145℃)
500	10	±5 ±2×2.5%	0.4~1.14	Dyn11 Yyn0	0.8	4.0~10.0	670	4130	4390	4705
630					0.7		775	4975	5290	5660
800					0.7		875	5895	6265	6715
1000					0.7		1020	6885	7315	7885
1250					0.7		1205	8190	8720	9335
1600					0.7		1415	9945	10555	11320
2000					0.6		1760	12240	13005	14005
2500					0.6		2080	14535	15445	16605
3150					0.5		2520	17950	19095	20490

Rated Capacity: Covers 500 kVA to 3150 kVA, meeting the step-up and grid-connection requirements of medium to large-scale PV, wind, and energy storage projects.

High Voltage Adaptability: High Voltage (HV) side rated voltage covers a range of 10kV to 12kV. Low Voltage (LV) side is designed for a wide range of 0.4kV to 1.14kV, allowing flexible matching with the DC/AC output voltage of PV strings, wind turbines, or battery clusters.

Voltage Regulation: Utilizes off-circuit tap-changing (NLTC), providing tapping ranges of ±5% or ±2×2.5%. This facilitates voltage ratio adjustment during system shutdown to optimize the voltage level at the grid connection point.

Vector Group: Available in two standard configurations, Dyn11 and Yyn0, to meet different system grounding and harmonic suppression requirements.

High-Efficiency Design: Both no-load losses and load losses are optimized. Load loss values are provided for three insulation classes: Class B (100℃), Class F (120℃), and Class H (145℃), catering to various operational temperature rise and whole-lifecycle efficiency needs.

Low No-Load Current: Features excellent no-load current levels across the entire series, helping to reduce plant auxiliary consumption and improve overall system efficiency.

Customizable Short-Circuit Impedance: Standard short-circuit impedance is designed for a wide range of 4.0% to 10.0%, allowing for customized selection based on specific project requirements for short-circuit current levels, voltage fluctuation, and system stability. This ensures safe grid integration and power quality.

Typical Applications

Specifically designed for various new energy power generation and energy storage systems, including:

PV Power Plants

For step-up applications in containerized substations or collector lines for centralized or large-scale distributed PV systems.

Wind Farms

Suitable for step-up at the generator terminal or within the station for doubly-fed or direct-drive wind turbines.

Energy Storage Power Stations (ESS)

For AC-side step-up and grid connection of electrochemical energy storage systems.

Others

Applicable in integrated energy stations, microgrids, and other scenarios requiring high-performance transformers.

Product Advantages

This series incorporates electrical and structural enhancements to address the fluctuating and intermittent nature of new energy generation. It offers strong short-circuit withstand capability, good overload performance, and resilience to harsh environments such as high altitudes, coastal salt fog, and desert sandstorms. Featuring a compact design and easy installation and maintenance, it is a reliable choice for building safe, efficient, and intelligent new energy power systems. Comprehensive customization services are available based on specific project technical specifications.

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