35kV Dry Type NLTC Power Transformer

Our 35kV dry-type three-phase two-winding off-circuit tap-changing power transformers are safe, flame-retardant solutions for indoor installations with stringent fire safety requirements.

• Dry-type epoxy resin insulation is non-flammable, explosion-proof, and pollution-free, eliminating fire hazards and allowing direct indoor installation without oil pits.

• HV side covers 35kV to 38.5kV with ±2×2.5% or ±5% off-circuit taps; LV options from 3.15kV to 11kV for flexible industrial and distribution matching.

• Rated from 800 kVA to 25000 kVA with no-load current as low as 0.3% for outstanding operational economy.

• Multiple vector groups available: Dyn11, Yd11, Yyn0, and YNd11; short-circuit impedance from 6% to 10% ensures effective fault current limitation.

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

Products Description

This product series represents a versatile and highly reliable dry-type power transformer designed for 35kV medium-voltage transmission/distribution networks and industrial applications. Utilizing an oil-free, flame-retardant dry-type insulation structure, it serves as an ideal core component for the safe, environmentally friendly, and efficient power conversion between 35kV grids and medium/low-voltage electrical equipment in substations, industrial plants, and urban infrastructure. It is particularly suitable for indoor installations with stringent fire safety requirements.

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℃)
800	35	±2×2.5% ±5	3.15 6 6.3 10 10.5 11	Dyn11 Yd11 Yyn0	0.85	6	2.02	8.87	9.4	10
1000					0.85		2.4	10.3	10.9	11.6
1250					0.75		2.81	12.1	12.9	13.8
1600					0.75		3.32	14.6	15.4	16.5
2000					0.65	7	3.8	17.2	18.2	19.5
2500					0.65	7	4.37	20.6	21.8	23.3
3150					0.6	8	5.42	23.1	24.5	26.2
4000					0.6		6.31	27.7	29.4	31.5
5000					0.55		7.53	32.9	34.9	37.4
6300					0.55		8.91	38.5	40.8	43.7
8000				Dyn11 Yd11 YNd11	0.45	9	10.1	43.4	46	49.3
10000					0.45		11.6	52.4	55.5	59.4
12500			6 6.3 10 10.5 11		0.35		14.1	60.9	64.6	69.1
16000					0.35		17.3	71.7	76	81.3
20000					0.3	10	20.6	80.6	85.5	91.5
25000					0.3	10	24.3	95.3	101	108

Advantages

1. Comprehensive Safety and Environmental Characteristics:

- Dry-Type Insulation Design: Employs epoxy resin casting or impregnation technology, featuring non-flammable, explosion-proof, non-toxic, and pollution-free properties. It fundamentally eliminates fire hazards and environmental pollution risks, meeting the highest levels of fire safety standards.

- Flexible Installation: Can be installed directly indoors, in basements, between floors, or close to load centers, saving space and civil engineering costs without the need for complex oil pits or fire protection systems.

2. Extensive Voltage Compatibility and Flexible Configuration:

- High-Voltage Side: Comprehensively covers standard system voltages of 35kV, 36kV, 37kV, and 38.5kV, and offers off-circuit tap-changing options of ±2×2.5% or ±5% to adapt to various grid voltage specifications.

- Low-Voltage Side: Provides multiple voltage options from 3.15kV to 11kV, including 3.15kV, 6kV, 6.3kV, 10kV, 10.5kV, and 11kV, perfectly matching the voltage requirements of industrial motors, plant distribution systems, and regional grids.

- Offers multiple standard vector groups, including Dyn11, Yd11, Yyn0, and YNd11, to meet various system grounding, harmonic mitigation, and protection configuration needs.

3. High Performance and Energy Efficiency:

- Wide capacity range from 800 kVA to 25000 kVA, meeting the comprehensive demands from small/medium distribution stations to large-scale industrial projects.

- Utilizes high-quality silicon steel and advanced winding techniques, achieving a no-load current as low as 0.3%. Both no-load and load losses are optimized, ensuring outstanding operational economy.

- Load loss data is provided for three insulation thermal classes: B (100℃), F (120℃), and H (145℃), offering significant design flexibility to address different environmental temperatures and overload requirements.

4. High Reliability and Low Maintenance:

- Short-circuit impedance is reasonably designed (6% to 10%) with clear grading, facilitating system short-circuit current limitation and protection coordination.

- The dry-type structure is robust, resistant to moisture and contamination, and essentially maintenance-free, significantly reducing lifecycle operation and maintenance costs.

Applications

- Main 35kV substations or distribution stations for large public infrastructure such as urban rail transit, tunnels, airports, and ports.

- 35kV main step-down substations or plant substations in industrial enterprises with extreme fire safety requirements, such as petrochemical, steel metallurgy, and data centers.

- 35kV central distribution stations in commercial complexes, high-rise buildings, hospitals, and schools.

- 35kV transmission and distribution nodes in environmentally sensitive areas, such as water source protection zones and ecological parks.

Hot Tags: 35kv dry type nltc power transformer, China 35kv dry type nltc power transformer manufacturers, suppliers, factory, 35kV Dry Type NLTC Power Transformer, 35kV Dry Type OLTC Power Transformer, 35kv dry type transformer, 35kV Dry Type NLTC Transformer for New Energy