S22-10000/66-NX1 - TAIXUANTECH

S22-10000/66-NX1 Three-Phase Oil-Immersed Off-Circuit Tap-Changer Power Transformer

66kV Oil-Immersed Power Transformer Series

S22-10000/66-NX1 Three-Phase Oil-Immersed Off-Circuit Tap-Changer Power Transformer

The S22-10000/66-NX1 is a three-phase oil-immersed power transformer with a rated capacity of 10000kVA and a high-voltage side rating of 66kV. It is designed with S22 loss level, achieving Class 1 energy efficiency (NX1) according to GB 20052-2024, with no-load loss of 5.8 kW and load loss of 43.0 kW meeting the highest efficiency limits for 66kV power transformers. The transformer features a robust oil-immersed structure with high reliability, low loss, and strong short-circuit withstand capability. The core is made of high-quality cold-rolled grain-oriented silicon steel, and windings use oxygen-free copper conductors. It is suitable for 66kV power systems, providing reliable and energy-efficient power supply for substations, large industrial parks, and urban power grids.

Industrial & Commercial Utility & Grid

Rated Capacity: 10000 kVA
Rated Voltage Ratio: 66/10.5 kV
Connection Group: YNd11
Cooling Method: ONAN
Energy Efficiency Class: NX1
Standard：IEC 60076, GB/T 6451-2023

Product Details

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Product Model S22-10000/66-NX1

No-Load Loss ≤5.8 kW

Rated Capacity 10000 kVA

No-Load Current ≤0.45%

Phase 3-phase

Load Loss (75°C) ≤43 kW

Rated Voltage Ratio 66/10.5 kV

Short-Circuit Impedance 9.0%

HV Tapping Range ±2×2.5%

Temperature Rise Limit Top oil ≤55K, Winding ≤65K

Rated Frequency 50 Hz

Noise (Sound Pressure Level) ≤60 dB(A)

Connection Group YNd11

Protection Degree IP54

Cooling Method ONAN

Standard IEC 60076, GB/T 6451-2023

Insulation Class A, LI325 AC140 / LI75 AC35

Energy Efficiency Class NX1

01.

Core advantages

Class 1 Energy Efficiency (NX1)

Complies with GB 20052-2024 Class 1 energy efficiency standard. No-load loss is reduced by more than 30% and load loss by more than 20% compared with conventional models, significantly reducing long-term operating costs

High Reliability & Strong Short-Circuit Withstand

Optimized core and winding design, combined with a robust oil-immersed structure, ensures stable operation under heavy loads with strong short-circuit resistance and long service life.

Low Loss Design (S22 Level)

Optimized core and coil design achieves low no-load and load losses, ensuring reliable and efficient operation for substations, industrial and mining enterprises, and power transmission applications.

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

66kV Oil-Immersed Power Transformer Series – Full Specifications

66kV, 3-phase, 2-winding, oil-immersed, off-circuit tap-changer, power transformer, 630-63000kVA
Model	Rated Capacity (kVA)	HV (kV)	HV Tapping Range	LV (kV)	Vector Group	No-Load Loss (kW)	Load Loss (75°C) (kW)	Impedance Voltage (%)
S22-630/66	630	66，66，69	±5%	6.3，6.6，10.5	Yd11	0.672	6.413	8
S20-630/66	630	66，66，69	±5%	6.3，6.6，10.5	Yd11	0.768	6.413	8
S18-630/66	630	66，66，69	±5%	6.3，6.6，10.5	Yd11	0.960	6.750	8
S22-800/66	800	66，66，69	±5%	6.3，6.6，10.5	Yd11	0.840	7.676	8
S20-800/66	800	66，66，69	±5%	6.3，6.6，10.5	Yd11	0.960	7.676	8
S18-800/66	800	66，66，69	±5%	6.3，6.6，10.5	Yd11	1.200	8.080	8
S22-1000/66	1000	66，66，69	±5%	6.3，6.6，10.5	Yd11	0.952	8.845	8
S20-1000/66	1000	66，66，69	±5%	6.3，6.6，10.5	Yd11	1.088	8.845	8
S18-1000/66	1000	66，66，69	±5%	6.3，6.6，10.5	Yd11	1.360	9.310	8
S22-1250/66	1250	66，66，69	±5%	6.3，6.6，10.5	Yd11	1.120	10.735	8
S20-1250/66	1250	66，66，69	±5%	6.3，6.6，10.5	Yd11	1.280	10.735	8
S18-1250/66	1250	66，66，69	±5%	6.3，6.6，10.5	Yd11	1.600	11.300	8
S22-1600/66	1600	66，66，69	±5%	6.3，6.6，10.5	Yd11	1.344	12.635	8
S20-1600/66	1600	66，66，69	±5%	6.3，6.6，10.5	Yd11	1.536	12.635	8
S18-1600/66	1600	66，66，69	±5%	6.3，6.6，10.5	Yd11	1.920	13.300	8
S22-2000/66	2000	66，66，69	±5%	6.3，6.6，10.5	Yd11	1.568	15.010	8
S20-2000/66	2000	66，66，69	±5%	6.3，6.6，10.5	Yd11	1.792	15.010	8
S18-2000/66	2000	66，66，69	±5%	6.3，6.6，10.5	Yd11	2.240	15.800	8
S22-2500/66	2500	66，66，69	±5%	6.3，6.6，10.5	Yd11	1.904	17.670	8
S20-2500/66	2500	66，66，69	±5%	6.3，6.6，10.5	Yd11	2.176	17.670	8
S18-2500/66	2500	66，66，69	±5%	6.3，6.6，10.5	Yd11	2.720	18.600	8
S22-3150/66-NX1	3150	66，66，69	±5%	6.3，6.6，10.5	YNd11	2.200	20.700	8
S20-3150/66-NX2	3150	66，66，69	±5%	6.3，6.6，10.5	YNd11	2.600	20.700	8
S18-3150/66-NX3	3150	66，66，69	±5%	6.3，6.6，10.5	YNd11	3.200	21.900	8
S22-4000/66-NX1	4000	66，66，69	±5%	6.3，6.6，10.5	YNd11	2.600	24.600	8
S20-4000/66-NX2	4000	66，66，69	±5%	6.3，6.6，10.5	YNd11	3.100	24.600	8
S18-4000/66-NX3	4000	66，66，69	±5%	6.3，6.6，10.5	YNd11	3.800	25.900	8
S22-5000/66-NX1	5000	66，66，69	±5%	6.3，6.6，10.5	YNd11	3.100	27.600	8
S20-5000/66-NX2	5000	66，66，69	±5%	6.3，6.6，10.5	YNd11	3.700	27.600	8
S18-5000/66-NX3	5000	66，66，69	±5%	6.3，6.6，10.5	YNd11	4.600	29.200	8
S22-6300/66-NX1	6300	66，66，69	±2×2.5%	6.3，6.6，10.5	YNd11	4.000	30.800	9
S20-6300/66-NX2	6300	66，66，69	±2×2.5%	6.3，6.6，10.5	YNd11	4.700	30.800	9
S18-6300/66-NX3	6300	66，66，69	±2×2.5%	6.3，6.6，10.5	YNd11	5.800	32.500	9
S22-8000/66-NX1	8000	66，66，69	±2×2.5%	6.3，6.6，10.5	YNd11	4.900	36.500	9
S20-8000/66-NX2	8000	66，66，69	±2×2.5%	6.3，6.6，10.5	YNd11	5.800	36.500	9
S18-8000/66-NX3	8000	66，66，69	±2×2.5%	6.3，6.6，10.5	YNd11	7.100	38.500	9
S22-10000/66-NX1	10000	66，66，69	±2×2.5%	6.3，6.6，10.5	YNd11	5.800	43.000	9
S20-10000/66-NX2	10000	66，66，69	±2×2.5%	6.3，6.6，10.5	YNd11	6.800	43.000	9
S18-10000/66-NX3	10000	66，66，69	±2×2.5%	6.3，6.6，10.5	YNd11	8.400	45.400	9
S22-12500/66-NX1	12500	66，66，69	±2×2.5%	6.3，6.6，10.5	YNd11	6.800	51.100	9
S20-12500/66-NX2	12500	66，66，69	±2×2.5%	6.3，6.6，10.5	YNd11	8.100	51.100	9
S18-12500/66-NX3	12500	66，66，69	±2×2.5%	6.3，6.6，10.5	YNd11	9.900	54.000	9
S22-16000/66-NX1	16000	66，66，69	±2×2.5%	6.3，6.6，10.5	YNd11	8.300	62.800	9
S20-16000/66-NX2	16000	66，66，69	±2×2.5%	6.3，6.6，10.5	YNd11	9.800	62.800	9
S18-16000/66-NX3	16000	66，66，69	±2×2.5%	6.3，6.6，10.5	YNd11	12.000	66.300	9
S22-20000/66-NX1	20000	66，66，69	±2×2.5%	6.3，6.6，10.5	YNd11	9.700	76.100	9
S20-20000/66-NX2	20000	66，66，69	±2×2.5%	6.3，6.6，10.5	YNd11	11.400	76.100	9
S18-20000/66-NX3	20000	66，66，69	±2×2.5%	6.3，6.6，10.5	YNd11	14.100	80.400	9
S22-25000/66-NX1	25000	66，66，69	±2×2.5%	6.3，6.6，10.5	YNd11	11.400	90.000	9
S20-25000/66-NX2	25000	66，66，69	±2×2.5%	6.3，6.6，10.5	YNd11	13.500	90.000	9
S18-25000/66-NX3	25000	66，66，69	±2×2.5%	6.3，6.6，10.5	YNd11	16.600	95.000	9
S22-31500/66-NX1	31500	66，66，69	±2×2.5%	6.3，6.6，10.5	YNd11	13.500	108.000	9
S20-31500/66-NX2	31500	66，66，69	±2×2.5%	6.3，6.6，10.5	YNd11	16.000	108.000	9
S18-31500/66-NX3	31500	66，66，69	±2×2.5%	6.3，6.6，10.5	YNd11	19.700	114.000	9
S22-40000/66-NX1	40000	66，66，69	±2×2.5%	6.3，6.6，10.5	YNd11	16.200	126.900	9
S20-40000/66-NX2	40000	66，66，69	±2×2.5%	6.3，6.6，10.5	YNd11	19.100	126.900	9
S18-40000/66-NX3	40000	66，66，69	±2×2.5%	6.3，6.6，10.5	YNd11	23.500	134.000	9
S22-50000/66-NX1	50000	66，66，69	±2×2.5%	6.3，6.6，10.5	YNd11	19.400	150.300	9
S20-50000/66-NX2	50000	66，66，69	±2×2.5%	6.3，6.6，10.5	YNd11	22.900	150.300	9
S18-50000/66-NX3	50000	66，66，69	±2×2.5%	6.3，6.6，10.5	YNd11	28.200	158.700	9
S22-63000/66-NX1	63000	66，66，69	±2×2.5%	6.3，6.6，10.5	YNd11	22.900	178.200	9
S20-63000/66-NX2	63000	66，66，69	±2×2.5%	6.3，6.6，10.5	YNd11	27.000	178.200	9
S18-63000/66-NX3	63000	66，66，69	±2×2.5%	6.3，6.6，10.5	YNd11	33.300	188.100	9
Note： 1.Tapping range options: ±2×2.5% or ±5% are shown as defaults 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) apply to 3150kVA and above, in accordance with GB 20052-2024. 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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S22-10000/66-NX1 Three-Phase Oil-Immersed Off-Circuit Tap-Changer Power Transformer

66kV Oil-Immersed Power Transformer Series

S22-10000/66-NX1 Three-Phase Oil-Immersed Off-Circuit Tap-Changer Power Transformer