SCB18-3150/35-NX1 - TAIXUANTECH

SCB18-3150/35-NX1 Three-Phase Two-Winding Dry-Type Off-Circuit Tap-Changer Renewable Energy Transformer

35kV Dry-Type Renewable Energy Transformer Series

SCB18-3150/35-NX1 Three-Phase Two-Winding Dry-Type Off-Circuit Tap-Changer Renewable Energy Transformer

The SCB18-3150/35-NX1 is a three-phase, two-winding dry-type transformer with epoxy resin casting and an off-circuit tap changer, rated at 3150kVA and 35kV on the high-voltage side. It is specifically designed for large-scale renewable energy applications (PV, wind, and energy storage), stepping up the low-voltage output from inverters or PCS (0.4–1.14kV) to a 35kV collector grid. Designed to meet Class 1 energy efficiency (NX1) under GB 20052-2024, it delivers exceptionally low no-load loss for continuous station operation. The transformer features vacuum-cast F-class epoxy resin insulation, offering excellent flame retardancy, moisture resistance, and maintenance-free operation. Low-voltage windings use copper foil conductors to handle high currents, and the core is made of high-grade grain-oriented silicon steel, ensuring low partial discharge and strong short-circuit withstand capability. It is particularly suitable for the high-capacity, high-reliability requirements of large renewable energy bases and offshore wind applications.

Renewable Energy

Rated Capacity: 3150 kVA
Rated Voltage Ratio: 35~38.5 / 0.4-1.14 kV
Connection Group: Dyn11
Cooling Method: AN / AF
Energy Efficiency Class: NX1
Standard：IEC 60076, GB/T 10228-2023, GB 20052-2024

Product Details

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Product Model SCB18-3150/35-NX1

No-Load Loss ≤3.5 kW

Rated Capacity 3150 kVA

No-Load Current ≤0.6%

Phase Three-phase

Load Loss (120°C) ≤22.1 kW

Rated Voltage Ratio 35~38.5/0.4~1.14 kV

Short-Circuit Impedance 6~14%

HV Tapping Range ±2×2.5%

Temperature Rise Limit Winding ≤100K (F-class)

Rated Frequency 50 Hz

Noise (Sound Pressure Level) ≤65dB(A)

Connection Group Dyn11

Protection Degree IP20 (IP54 available)

Cooling Method AN / AF

Standard IEC 60076, GB/T 10228-2023, GB 20052-2024

Insulation Class F (155°C), LI170 AC70 / AC5

Energy Efficiency Class NX1

01.

Core advantages

Class 1 Energy Efficiency (NX1)

Complies with GB 20052-2024 Class 1 energy efficiency standard for 35kV renewable energy dry-type transformers. Its exceptionally low no-load loss directly reduces the auxiliary power consumption of the station, ensuring more generated electricity is delivered to the grid. For large-scale bases that operate continuously, the energy savings over the service life are substantial. Actual measured losses are typically lower than the standard limits; detailed test reports can be provided upon request.

High-Capacity Dry-Type Safety

At 3150kVA, this transformer provides the high capacity required for large renewable energy collection systems while retaining the inherent safety of dry-type construction—no oil leakage, no fire risk. The F-class epoxy casting provides excellent moisture and pollution resistance. Partial discharge is controlled at a very low level (≤5 pC), ensuring long-term insulation reliability in humid, dusty, or coastal environments. This makes it particularly suitable for large PV/wind/storage stations and offshore wind platforms with strict fire safety and environmental requirements.

Optimized for Harmonics, High-Current & Overload

The low-voltage side is designed with copper foil windings to handle the high currents from large inverters and PCS. The electromagnetic design is optimized to withstand harmonics generated by power electronics. With forced-air cooling (AF), the transformer can handle short-term overloads, making it suitable for the frequent load fluctuations and impact loads typical of large renewable energy stations and offshore wind turbines.

02.

Application scenarios

No data was found

01.

Authoritative Certification

Our transformers are CE certified, ensuring full compliance with EU safety, health, and environmental standards.

Our transformers are UL certified, confirming they meet rigorous ANSI/IEEE safety standards for North American market entry.

ASTA

Our transformers have obtained ASTA type-test certification, verifying IEC 60076 compliance.

EAC

Our transformers are EAC certified, ensuring compliance with safety and EMC regulations for the Eurasian market.

SASO

We provide SASO-compliant transformers and assist clients in obtaining the Batch Certificate of Conformity (CoC) through the SABER platform.

02.

Quality Assurance

Partner Factory Audit

Regular on-site audits of partner factories to verify ISO, CE, and UL certifications.

Full-Process Quality Control

From raw material inspection to pre-shipment final inspection, every unit is checked against specifications.

Comprehensive Test Reports

Each transformer includes a detailed factory test report. 100% full inspection before dispatch.

Third-Party Inspection Support

SGS, BV, or other accredited third-party inspection available upon customer request.

01.

Technical Documents

No data was found

02.

Certification Materials

No data was found

35kV Dry-Type Renewable Energy Transformer Series – Full Specifications

35kV, 3-phase, 2-winding, dry-type, off-circuit tap-changer, renewable energy transformer, 35-38.5kV / 0.4-1.14kV, 1000-10000kVA
Model	Rated Capacity (kVA)	HV (kV)	HV Tapping Range	LV (kV)	Vector Group	No-Load Loss (kW)	Load Loss (kW)			Impedance Voltage (%)
Model	Rated Capacity (kVA)	HV (kV)	HV Tapping Range	LV (kV)	Vector Group	No-Load Loss (kW)	B（100℃）	F（120℃）	H（145℃）	Impedance Voltage (%)
SCB18-1000/35-NX1	1000	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Dyn11	1.400	8.800	9.400	10.100	6~14
SCB14-1000/35-NX2	1000	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Dyn11	1.600	8.800	9.400	10.100	6~14
SCB12-1000/35-NX3	1000	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Dyn11	1.700	9.800	10.400	11.200	6~14
SCB18-1250/35-NX1	1250	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Dyn11	1.600	10.700	11.400	12.200	6~14
SCB14-1250/35-NX2	1250	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Dyn11	1.800	10.700	11.400	12.200	6~14
SCB12-1250/35-NX3	1250	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Dyn11	2.000	11.900	12.700	13.500	6~14
SCB18-1600/35-NX1	1600	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Dyn11	1.900	13.100	13.900	14.900	6~14
SCB14-1600/35-NX2	1600	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Dyn11	2.100	13.100	13.900	14.900	6~14
SCB12-1600/35-NX3	1600	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Dyn11	2.300	14.500	15.400	16.500	6~14
SCB18-2000/35-NX1	2000	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Dyn11	2.200	15.400	16.400	17.500	6~14
SCB14-2000/35-NX2	2000	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Dyn11	2.500	15.400	16.400	17.500	6~14
SCB12-2000/35-NX3	2000	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Dyn11	2.700	17.100	18.200	19.400	6~14
SCB18-2500/35-NX1	2500	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Dyn11	2.600	18.500	19.600	21.000	6~14
SCB14-2500/35-NX2	2500	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Dyn11	2.900	18.500	19.600	21.000	6~14
SCB12-2500/35-NX3	2500	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Dyn11	3.200	20.500	21.800	23.300	6~14
SCB18-3000/35-NX1	3000	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Dyn11	3.200	20.300	21.600	23.100	6~14
SCB14-3000/35-NX2	3000	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Dyn11	3.500	20.300	21.600	23.100	6~14
SCB12-3000/35-NX3	3000	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Dyn11	3.900	22.600	24.000	25.600	6~14
SCB18-3150/35-NX1	3150	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Dyn11	3.500	20.700	22.100	23.500	6~14
SCB14-3150/35-NX2	3150	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Dyn11	3.900	20.700	22.100	23.500	6~14
SCB12-3150/35-NX3	3150	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Dyn11	4.300	23.100	24.500	26.100	6~14
SCB18-4000/35-NX1	4000	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Dyn11	4.100	24.900	26.500	28.200	6~14
SCB14-4000/35-NX2	4000	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Dyn11	4.500	24.900	26.500	28.200	6~14
SCB12-4000/35-NX3	4000	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Dyn11	5.000	27.700	29.400	31.300	6~14
SCB18-4500/35-NX1	4500	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Dyn11	4.400	27.400	29.100	31.100	6~14
SCB14-4500/35-NX2	4500	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Dyn11	4.900	27.400	29.100	31.100	6~14
SCB12-4500/35-NX3	4500	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Dyn11	5.400	30.400	32.300	34.500	6~14
SCB18-5000/35-NX1	5000	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Dyn11	4.800	29.600	31.400	33.600	6~14
SCB14-5000/35-NX2	5000	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Dyn11	5.400	29.600	31.400	33.600	6~14
SCB12-5000/35-NX3	5000	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Dyn11	6.000	32.800	34.900	37.300	6~14
SCB18-6300/35-NX1	6300	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Dyn11	5.700	34.600	36.700	39.200	6~14
SCB14-6300/35-NX2	6300	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Dyn11	6.400	34.600	36.700	39.200	6~14
SCB12-6300/35-NX3	6300	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Dyn11	7.100	38.400	40.800	43.600	6~14
SCB18-8000/35-NX1	8000	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Dyn11	6.900	41.700	44.300	47.300	6~14
SCB14-8000/35-NX2	8000	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Dyn11	7.600	41.700	44.300	47.300	6~14
SCB12-8000/35-NX3	8000	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Dyn11	8.500	46.300	49.200	52.600	6~14
SCB18-10000/35-NX1	10000	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Dyn11	8.200	49.000	52.100	55.700	6~14
SCB14-10000/35-NX2	10000	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Dyn11	9.100	49.000	52.100	55.700	6~14
SCB12-10000/35-NX3	10000	35, 38.5	±2×2.5%	0.4, 0.69, 0.8, 1.14	Dyn11	10.200	54.500	57.900	61.900	6~14
Note： 1.±2×2.5% is shown as the default tapping range in this table. Other tapping ranges are available upon request. 2.Other high and low voltages are available upon request. 3.Other vector groups are available upon request. 4.Efficiency classes (NX1/NX2/NX3) are in accordance with GB 20052-2024 for renewable energy transformers (PV, wind, energy storage) of 500kVA and above. 5.For IEC, ANSI, or other standards, or special frequency requirements, please contact us for a customized datasheet.

* For specific product requests, please Contact Us for customized solutions to your needs.

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SCB18-3150/35-NX1 Three-Phase Two-Winding Dry-Type Off-Circuit Tap-Changer Renewable Energy Transformer

35kV Dry-Type Renewable Energy Transformer Series

SCB18-3150/35-NX1 Three-Phase Two-Winding Dry-Type Off-Circuit Tap-Changer Renewable Energy Transformer