SCB18-630/20 - TAIXUANTECH

SCB18-630/20 Three-Phase Two-Winding Dry-Type Air-Cooled Off-Circuit Tap-Changer Distribution Transformer

20kV Dry-Type Distribution Transformer Series

SCB18-630/20 Three-Phase Two-Winding Dry-Type Air-Cooled Off-Circuit Tap-Changer Distribution Transformer

The SCB18-630/20 is a three-phase, two-winding dry-type distribution transformer with epoxy resin casting and an off-circuit tap changer, rated at 630kVA and 20kV on the high-voltage side. It is designed for indoor applications where fire safety, moisture resistance, and maintenance-free operation are essential. The transformer features vacuum-cast epoxy resin insulation, providing excellent flame retardancy and pollution resistance. The core is made of high-quality cold-rolled grain-oriented silicon steel, and low-voltage windings use copper foil conductors, ensuring low partial discharge, low temperature rise, and strong short-circuit withstand capability. Typical applications include commercial buildings, hospitals, airports, metro stations, data centers, and other indoor locations where fire safety and high energy efficiency are essential.

Data Center Industrial & Commercial Utility & Grid

Rated Capacity: 630 kVA
Rated Voltage Ratio: 20/0.4 kV
Connection Group: Dyn11
Cooling Method: AN
Energy Efficiency Class: N/A
Standard：IEC 60076, GB/T 10228-2023

Product Details

Learn more about our products

Product Model SCB18-630/20

No-Load Loss ≤1.028 kW

Rated Capacity 630 kVA

No-Load Current ≤0.9%

Phase 3-phase

Load Loss (120°C) ≤6.156 kW

Rated Voltage Ratio 20/0.4 kV

Short-Circuit Impedance 6%

HV Tapping Range ±2×2.5%

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

Rated Frequency 50 Hz

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

Connection Group Dyn11 (Yyn0 available upon request)

Protection Degree IP20 (IP23 available)

Cooling Method AN

Standard IEC 60076, GB/T 10228-2023

Insulation Class F (155°C), LI125 AC50 / AC5

Energy Efficiency Class N/A

01.

Core advantages

High Energy Efficiency Design (SCB18 Level)

Designed with SCB18-level low-loss core and winding. Compared with conventional models, no-load loss is significantly reduced, delivering substantial energy savings over the transformer's service life, especially for continuous light-load applications such as data centers and commercial buildings. Actual measured losses are typically lower than the standard limits, and detailed test data can be provided upon request.

Vacuum-Cast Epoxy Resin

High and low voltage windings are fully impregnated in F-class epoxy resin under vacuum conditions, providing excellent flame retardancy, moisture resistance, and pollution resistance. The transformer is maintenance-free and suitable for indoor installation, including basements, tunnels, and other enclosed spaces.

Low Partial Discharge & Strong Short-Circuit Withstand

Optimized insulation structure and copper foil low-voltage windings ensure low partial discharge and strong short-circuit withstand capability. The transformer maintains stable operation under continuous load with a long service life.

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

20kV Dry-Type Distribution Transformer Series – Full Specifications

20kV, 3-phase, 2-winding, dry-type, off-circuit tap-changer, distribution transformer, 50-2500kVA
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 (%)
SCB18-50/20	50	20，22，24	±5%	0.4	Dyn11，Yyn0	0.229	1.044	1.107	1.179	6
SCB14-50/20	50	20，22，24	±5%	0.4	Dyn11，Yyn0	0.259	1.044	1.107	1.179	6
SCB12-50/20	50	20，22，24	±5%	0.4	Dyn11，Yyn0	0.275	1.160	1.230	1.310	6
SCB18-100/20	100	20，22，24	±5%	0.4	Dyn11，Yyn0	0.364	1.683	1.791	1.917	6
SCB14-100/20	100	20，22，24	±5%	0.4	Dyn11，Yyn0	0.412	1.683	1.791	1.917	6
SCB12-100/20	100	20，22，24	±5%	0.4	Dyn11，Yyn0	0.437	1.870	1.990	2.130	6
SCB18-160/20	160	20，22，24	±5%	0.4	Dyn11，Yyn0	0.450	2.097	2.223	2.376	6
SCB14-160/20	160	20，22，24	±5%	0.4	Dyn11，Yyn0	0.510	2.097	2.223	2.376	6
SCB12-160/20	160	20，22，24	±5%	0.4	Dyn11，Yyn0	0.540	2.330	2.470	2.640	6
SCB18-200/20	200	20，22，24	±5%	0.4	Dyn11，Yyn0	0.491	2.493	2.646	2.826	6
SCB14-200/20	200	20，22，24	±5%	0.4	Dyn11，Yyn0	0.557	2.493	2.646	2.826	6
SCB12-200/20	200	20，22，24	±5%	0.4	Dyn11，Yyn0	0.590	2.770	2.940	3.140	6
SCB18-250/20	250	20，22，24	±5%	0.4	Dyn11，Yyn0	0.566	2.898	3.078	3.294	6
SCB14-250/20	250	20，22，24	±5%	0.4	Dyn11，Yyn0	0.642	2.898	3.078	3.294	6
SCB12-250/20	250	20，22，24	±5%	0.4	Dyn11，Yyn0	0.680	3.220	3.420	3.660	6
SCB18-315/20	315	20，22，24	±5%	0.4	Dyn11，Yyn0	0.653	3.465	3.672	3.924	6
SCB14-315/20	315	20，22，24	±5%	0.4	Dyn11，Yyn0	0.740	3.465	3.672	3.924	6
SCB12-315/20	315	20，22，24	±5%	0.4	Dyn11，Yyn0	0.783	3.850	4.080	4.360	6
SCB18-400/20	400	20，22，24	±5%	0.4	Dyn11，Yyn0	0.773	4.185	4.356	4.662	6
SCB14-400/20	400	20，22，24	±5%	0.4	Dyn11，Yyn0	0.876	4.185	4.356	4.662	6
SCB12-400/20	400	20，22，24	±5%	0.4	Dyn11，Yyn0	0.927	4.650	4.840	5.180	6
SCB18-500/20	500	20，22，24	±5%	0.4	Dyn11，Yyn0	0.908	4.914	5.211	5.571	6
SCB14-500/20	500	20，22，24	±5%	0.4	Dyn11，Yyn0	1.029	4.914	5.211	5.571	6
SCB12-500/20	500	20，22，24	±5%	0.4	Dyn11，Yyn0	1.089	5.460	5.790	6.190	6
SCB18-630/20	630	20，22，24	±5%	0.4	Dyn11，Yyn0	1.028	5.805	6.156	6.588	6
SCB14-630/20	630	20，22，24	±5%	0.4	Dyn11，Yyn0	1.165	5.805	6.156	6.588	6
SCB12-630/20	630	20，22，24	±5%	0.4	Dyn11，Yyn0	1.233	6.450	6.840	7.320	6
SCB18-800/20	800	20，22，24	±5%	0.4	Dyn11，Yyn0	1.178	7.011	7.434	7.956	6
SCB14-800/20	800	20，22，24	±5%	0.4	Dyn11，Yyn0	1.335	7.011	7.434	7.956	6
SCB12-800/20	800	20，22，24	±5%	0.4	Dyn11，Yyn0	1.413	7.790	8.260	8.840	6
SCB18-1000/20	1000	20，22，24	±5%	0.4	Dyn11，Yyn0	1.395	8.298	8.802	9.360	6
SCB14-1000/20	1000	20，22，24	±5%	0.4	Dyn11，Yyn0	1.581	8.298	8.802	9.360	6
SCB12-1000/20	1000	20，22，24	±5%	0.4	Dyn11，Yyn0	1.674	9.220	9.780	10.400	6
SCB18-1250/20	1250	20，22，24	±5%	0.4	Dyn11，Yyn0	1.605	9.720	10.350	11.070	6
SCB14-1250/20	1250	20，22，24	±5%	0.4	Dyn11，Yyn0	1.819	9.720	10.350	11.070	6
SCB12-1250/20	1250	20，22，24	±5%	0.4	Dyn11，Yyn0	1.926	10.800	11.500	12.300	6
SCB18-1600/20	1600	20，22，24	±5%	0.4	Dyn11，Yyn0	1.883	11.700	12.420	13.320	6
SCB14-1600/20	1600	20，22，24	±5%	0.4	Dyn11，Yyn0	2.134	11.700	12.420	13.320	6
SCB12-1600/20	1600	20，22，24	±5%	0.4	Dyn11，Yyn0	2.259	13.000	13.800	14.800	6
SCB18-2000/20	2000	20，22，24	±5%	0.4	Dyn11，Yyn0	2.183	13.860	14.670	15.750	6
SCB14-2000/20	2000	20，22，24	±5%	0.4	Dyn11，Yyn0	2.474	13.860	14.670	15.750	6
SCB12-2000/20	2000	20，22，24	±5%	0.4	Dyn11，Yyn0	2.619	15.400	16.300	17.500	6
SCB18-2500/20	2500	20，22，24	±5%	0.4	Dyn11，Yyn0	2.610	16.380	17.370	18.630	6
SCB14-2500/20	2500	20，22，24	±5%	0.4	Dyn11，Yyn0	2.958	16.380	17.370	18.630	6
SCB12-2500/20	2500	20，22，24	±5%	0.4	Dyn11，Yyn0	3.132	18.200	19.300	20.700	6
Note： 1.Tapping range options: ±5% or ±2×2.5%. ±5% is shown as default in this table. Other tapping ranges are available upon request. 2.Other high and low voltages are available upon request. 3.Vector group options: Dyn11 or Yyn0. Other vector groups are available upon request. 4.Insulation class: B/F/H available. Load losses are shown for reference temperatures of 100°C (Class B), 120°C (Class F), and 145°C (Class H) respectively. 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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SCB18-630/20 Three-Phase Two-Winding Dry-Type Air-Cooled Off-Circuit Tap-Changer Distribution Transformer

20kV Dry-Type Distribution Transformer Series

SCB18-630/20 Three-Phase Two-Winding Dry-Type Air-Cooled Off-Circuit Tap-Changer Distribution Transformer