SCB18-500/6-NX1 - TAIXUANTECH

SCB18-500/6-NX1 Three-Phase Two-Winding Dry-Type Off-Circuit Tap-Changer Renewable Energy Transformer

6kV Dry-Type Renewable Energy Transformer Series

SCB18-500/6-NX1 Three-Phase Two-Winding Dry-Type Off-Circuit Tap-Changer Renewable Energy Transformer

The SCB18-500/6-NX1 is a three-phase, two-winding dry-type transformer with epoxy resin casting and an off-circuit tap changer, rated at 500kVA and 6kV on the high-voltage side. It is specifically designed for renewable energy applications (PV, wind, and energy storage), where it steps up the low-voltage output from inverters/PCS (0.4–1.14kV) to a 6kV collector grid. Designed to meet Class 1 energy efficiency (NX1) under GB 20052-2024, it delivers exceptionally low no-load loss. The transformer features vacuum-cast epoxy resin insulation, offering excellent flame retardancy, moisture resistance, and maintenance-free operation. The 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, low temperature rise, and strong short-circuit withstand capability.

Renewable Energy

Rated Capacity: 500 kVA
Rated Voltage Ratio: 6-7.2 / 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 SCB18-500/6-NX1

No-Load Loss ≤0.67 kW

Rated Capacity 500 kVA

No-Load Current ≤0.8%

Phase Three-phase

Load Loss (120°C) ≤4.39 kW

Rated Voltage Ratio 6~7.2/0.4~1.14 kV

Short-Circuit Impedance 4~10%

HV Tapping Range ±5%

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

Rated Frequency 50 Hz

Noise (Sound Pressure Level) ≤55 dB(A)

Connection Group Dyn11

Protection Degree IP20 (IP23 available)

Cooling Method AN / AF

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

Insulation Class F (155°C), LI75 AC35 / AC5

Energy Efficiency Class NX1

01.

Core advantages

Class 1 Energy Efficiency (NX1)

Complies with GB 20052-2024 Class 1 energy efficiency standard. With exceptionally low no-load loss, it minimizes the auxiliary power consumption of the renewable energy station, ensuring more generated electricity is fed into the grid. Actual measured losses are typically lower than standard limits; detailed test reports can be provided upon request.

Dry-Type Safety

As a dry-type transformer, it eliminates the risk of oil leakage and fire, making it particularly suitable for PV/wind/storage stations with strict fire safety requirements. The epoxy resin casting provides excellent moisture resistance, allowing reliable operation in humid, dusty, or coastal environments. It is maintenance-free, significantly reducing O&M costs for remote renewable energy sites.

Optimized for Harmonics & Load Fluctuations

The electromagnetic design is optimized to withstand harmonics generated by inverters and PCS, preventing overheating. With forced-air cooling (AF), the transformer can handle short-term overloads, making it suitable for the frequent load fluctuations typical of renewable energy stations.

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

6kV Dry-Type Renewable Energy Transformer Series – Full Specifications

6kV, 3-phase, 2-winding, dry-type, off-circuit tap-changer, renewable energy transformer, 6-7.2kV / 0.4-1.14kV, 500-2000kVA
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 (%)
SCB18-500/6-NX1	500	6, 6.3, 6.6, 7.2	±5%	0.4, 0.69, 0.8, 1.14	Dyn11	0.670	4.130	4.390	4.705	4~10
SCB14-500/6-NX2	500	6, 6.3, 6.6, 7.2	±5%	0.4, 0.69, 0.8, 1.14	Dyn11	0.790	4.130	4.390	4.705	4~10
SCB12-500/6-NX3	500	6, 6.3, 6.6, 7.2	±5%	0.4, 0.69, 0.8, 1.14	Dyn11	0.930	4.590	4.880	5.230	4~10
SCB18-630/6-NX1	630	6, 6.3, 6.6, 7.2	±5%	0.4, 0.69, 0.8, 1.14	Dyn11	0.775	4.975	5.290	5.660	4~10
SCB14-630/6-NX2	630	6, 6.3, 6.6, 7.2	±5%	0.4, 0.69, 0.8, 1.14	Dyn11	0.910	4.975	5.290	5.660	4~10
SCB12-630/6-NX3	630	6, 6.3, 6.6, 7.2	±5%	0.4, 0.69, 0.8, 1.14	Dyn11	1.070	5.530	5.880	6.290	4~10
SCB18-800/6-NX1	800	6, 6.3, 6.6, 7.2	±5%	0.4, 0.69, 0.8, 1.14	Dyn11	0.875	5.895	6.265	6.715	4~10
SCB14-800/6-NX2	800	6, 6.3, 6.6, 7.2	±5%	0.4, 0.69, 0.8, 1.14	Dyn11	1.035	5.895	6.265	6.715	4~10
SCB12-800/6-NX3	800	6, 6.3, 6.6, 7.2	±5%	0.4, 0.69, 0.8, 1.14	Dyn11	1.215	6.550	6.960	7.460	4~10
SCB18-1000/6-NX1	1000	6, 6.3, 6.6, 7.2	±5%	0.4, 0.69, 0.8, 1.14	Dyn11	1.020	6.885	7.315	7.885	4~10
SCB14-1000/6-NX2	1000	6, 6.3, 6.6, 7.2	±5%	0.4, 0.69, 0.8, 1.14	Dyn11	1.205	6.885	7.315	7.885	4~10
SCB12-1000/6-NX3	1000	6, 6.3, 6.6, 7.2	±5%	0.4, 0.69, 0.8, 1.14	Dyn11	1.415	7.650	8.130	8.760	4~10
SCB18-1250/6-NX1	1250	6, 6.3, 6.6, 7.2	±5%	0.4, 0.69, 0.8, 1.14	Dyn11	1.205	8.190	8.720	9.335	4~10
SCB14-1250/6-NX2	1250	6, 6.3, 6.6, 7.2	±5%	0.4, 0.69, 0.8, 1.14	Dyn11	1.420	8.190	8.720	9.335	4~10
SCB12-1250/6-NX3	1250	6, 6.3, 6.6, 7.2	±5%	0.4, 0.69, 0.8, 1.14	Dyn11	1.670	9.100	9.690	10.370	4~10
SCB18-1600/6-NX1	1600	6, 6.3, 6.6, 7.2	±5%	0.4, 0.69, 0.8, 1.14	Dyn11	1.415	9.945	10.555	11.320	4~10
SCB14-1600/6-NX2	1600	6, 6.3, 6.6, 7.2	±5%	0.4, 0.69, 0.8, 1.14	Dyn11	1.665	9.945	10.555	11.320	4~10
SCB12-1600/6-NX3	1600	6, 6.3, 6.6, 7.2	±5%	0.4, 0.69, 0.8, 1.14	Dyn11	1.960	11.050	11.730	12.580	4~10
SCB18-2000/6-NX1	2000	6, 6.3, 6.6, 7.2	±5%	0.4, 0.69, 0.8, 1.14	Dyn11	1.760	12.240	13.005	14.005	4~10
SCB14-2000/6-NX2	2000	6, 6.3, 6.6, 7.2	±5%	0.4, 0.69, 0.8, 1.14	Dyn11	2.075	12.240	13.005	14.005	4~10
SCB12-2000/6-NX3	2000	6, 6.3, 6.6, 7.2	±5%	0.4, 0.69, 0.8, 1.14	Dyn11	2.440	13.600	14.450	15.560	4~10
Note： 1.±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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SCB18-500/6-NX1 Three-Phase Two-Winding Dry-Type Off-Circuit Tap-Changer Renewable Energy Transformer

6kV Dry-Type Renewable Energy Transformer Series

SCB18-500/6-NX1 Three-Phase Two-Winding Dry-Type Off-Circuit Tap-Changer Renewable Energy Transformer