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TSTYNICE Oil Natural Air Natural Cooling Transformer ONAN Power Transformer Manufacturer

TSTYNICE Air Natural Cooling Transformer ONAN Power Transformer Manufacturer

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TSTYNICE Oil Natural Air Natural Cooling Transformer ONAN Power Transformer Manufacturer

Buy high-performance Air Natural Cooling Transformers (ONAN Power Transformers) designed for reliable power distribution, energy efficiency, and long service life in industrial and utility applications.

Technical Specifications:
• Comprehensive Range: Models S9 through S22
• Voltage Coverage: 6kV to 35kV systems
• Capacity Spectrum: 15kVA to 31,500kVA configurations
• Certification Mastery: ISO 9001, IEC, SGS, Intertek, CCC, CE, BV, GOST compliant

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Technical Parameters

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High-Quality Air Natural Cooling Transformer Materials and Design

Our Air Natural Cooling Transformers (ONAN Power Transformers) are built from premium materials for exceptional performance and durability. Each unit features H62 high-conductivity copper rods with 30% lower resistance, premium mineral oil with dielectric strength above 56kV, and weather-resistant acrylic rubber gaskets. The galvanized steel enclosure exceeds GB standards and offers a 30-year rust-proof guarantee, ensuring reliability in harsh outdoor environments. Innovative features include grooved bushings to prevent UV damage and oil leaks, dual-sealed tap changers to avoid installation leaks, and stepped-core stacking technology that delivers 5% lower no-load loss compared to GB/T 6451 standards. Smart cooling technology further reduces load loss by 8–12%, making these transformers ideal for fluctuating load conditions.

Precision Manufacturing and Rigorous Testing for ONAN Power Transformers

Our transformers are produced using 95% automated manufacturing with Baosteel silicon steel, achieving a 50 units/day capacity—three times the traditional production speed. Advanced processes deliver 5dB noise reduction, 5% lower no-load loss, and ISO-certified vacuum oil filling and drying systems for long-lasting performance. Each ONAN Power Transformer undergoes rigorous CNAS-certified testing, including lightning impulse tests up to 250kV, temperature rise limits under 65K, and over 10 IEC-standard verifications, ensuring optimal safety, reliability, and efficiency in every installation.

All products carry CE/IEC/SGS/BV/GOST certifications. Our $8M R&D center develops next-gen solutions.Our air natural cooling transformer series represents the pinnacle of power conversion technology, delivering unmatched performance, safety, and durability. Engineered for excellence, these transformers set industry benchmarks for reliability across global power applications.

Technical Specifications:

Comprehensive Range	Models S9 through S22
Voltage Coverage	6kV to 35kV systems
Capacity Spectrum	15kVA to 31,500kVA configurations
Certification Mastery	ISO 9001, IEC, SGS, Intertek, CCC, CE, BV, GOST compliant

Technical Parameter for S Series 6kv - 11kv No-load Voltage Regulation Transformers

Rated Capacity (KVA)	Voltage Combination			Connection Group Symbol	No-load Loss R(W)	Load Loss R(W)	Impedance Voltage(%)	No-load Current (%)	LWH(mm)	Gauge Horizontal*Vertical (mm)	Active parts Weight (kg) * Oil Weight (kg)	Total Weight (kg)
Rated Capacity (KVA)	High Voltage（KV)	Tapping Range of High Voltage	Low Voltage （KV)	Connection Group Symbol	No-load Loss R(W)	Load Loss R(W)	Impedance Voltage(%)	No-load Current (%)	LWH(mm)	Gauge Horizontal*Vertical (mm)	Active parts Weight (kg) * Oil Weight (kg)	Total Weight (kg)
30	6 6.3 10 10.5 11	±5% ±2x2.5%	0.4	Dyn11 Yzn11 Yyn0	100	630/600	4	2.8	9807351145	400*400	178*78	355
50					130	910/870		2.5	10177581205	450*400	240*92	415
63					150	1090/1040		2.4	10357851285	450*400	285*105	505
80					180	1310/1250		2.2	10658001290	450*400	330*110	540
100					200	1580/1500		2.1	10728201305	450*400	345*116	590
125					240	1890/1800		2	115511051310	450*400	415*135	705
160					280	2310/2200		1.9	12358501535	550*550	485*135	835
200					340	2730/2600		1.8	12828601557	550*550	582*168	965
250					400	3200/3050		1.7	13109401605	550*550	695*210	1135
315					480	3830/3650		1.6	146511201915	660*650	855*255	1520
400					570	4520/4300		1.5	144011651725	660*650	950*295	1590
500					680	5410/5150		1.4	151012501845	660*650	1150*320	1905
630					810	6200	4.5	1.3	165011401920	660*650	1500*435	2015
800					980	7500		1.2	212511752315	820*820	1910*760	3510
1000					1150	10300		1.1	215013802570	820*820	2125*880	3850
1250					1360	12000		1	235514852570	820*820	2605*960	4610
1600					1640	14500		0.9	233517502630	820*820	3125*1150	5420
2000					1940	18300	5	0.4	194014001700	820*820	2420*780	4200
2500					2290	21200	5	0.4	205014801800	820*820	2560*780	4680

Technical Parameter for S Series 20kv No-load Voltage Regulation Transformer

Rated Capacity (KVA)	Voltage Combination			Connection Group Symbol	No-load Loss R(W)	Load Loss R(W)	Impedance Voltage(%)	No-load Current (%)
Rated Capacity (KVA)	High Voltage（KV)	Tapping Range of High Voltage	Low Voltage （KV)	Connection Group Symbol	No-load Loss R(W)	Load Loss R(W)	Impedance Voltage(%)	No-load Current (%)
30	20		0.4		90	690/660	5.5	2.1
50					130	1010/960		2
63					150	1200/1150		1.9
80					180	1440/1370		1.8
100					200	1730/1650		1.6
125					240	2080/1980		1.5
160				Dyn11	290	2540/2420		1.4
200		±5%		Yzn11	340	3000/2860		1.3
250		±2x2.5%		Yyn0	400	3520/3350		1.2
315					480	4210/4010		1.1
400					570	4970/4730		1
500					680	5940/5660		1
630					810	6820	6	0.9
800					980	8250		0.8
1000					1150	11330		0.7
1250					1380	13200		0.7
1600					1660	15950		0.6
2000					1950	19140		0.6
2500					2340	22200		0.5

Technical Parameter for S Series 35kv No-load Voltage Regulation Transformer

Rated Capacity (KVA)	Voltage Combination			Connection Group Symbol	No-load Loss R(W)	Load Loss R(W)	Impedance Voltage(%)	No-load Current (%)	LWH (mm)	Gauge Horizontal*Vertical (mm)	Active parts Weight (kg) * Oil Weight (kg)	Total Weight (kg)
Rated Capacity (KVA)	High Voltage（KV)	Tapping Range of High Voltage	Low Voltage （KV)	Connection Group Symbol	No-load Loss R(W)	Load Loss R(W)	Impedance Voltage(%)	No-load Current (%)	LWH (mm)	Gauge Horizontal*Vertical (mm)	Active parts Weight (kg) * Oil Weight (kg)	Total Weight (kg)
50	35 38.5	±5% ±2x2.5%	0.4	Dyn11 Yyn0	160	1200/1140	6.5	1.3	11959351825	660*660	300*330	860
100					230	2010/1910		1.1	12009951935	660*660	470*383	1130
125					270	2370/2260		1.1	12359401955	660*660	550*465	1335
160					280	2820/2680		1	12858951950	660*660	580*485	1475
200					340	3320/3160		1	131011501985	660*660	680*595	1755
250					400	3950/3760		0.95	145010902010	660*660	860*650	2000
315					480	4750/4530		0.95	193010652320	820*820	980*765	2290
400					580	5740/5470		0.85	185011652015	820*820	1170*885	2725
500					680	6910/6580		0.85	204512052415	820*820	1340*960	3090
630					830	7860		0.65	208512402515	660*660	1550*895	3810
800					980	9400		0.65	230516152685	820*820	1990*1030	4510
1000					1150	11500		0.65	254515402590	1070*1070	2415*1475	5055
1250					1400	13900		0.6	249520102675	820*820	2480*1405	5290
1600					1690	16600		0.6	268021002770	820*820	2600*1490	5450
2000					1990	19700		0.55	279021802860	820*820	2720*1590	5600
2500					2360	23200		0.55	290022902980	1070*1070	2830*1720	5760

Spanning 250,000 in Henan, our smart factory leverages 5G automation to produce 3,000+ IEC/CE-certified substations annually. With 158 patents and 99% automation, we power projects across 80+ countries.

Q: Are you a factory or a trade company?

A: Integrated Manufacturing & Trading, OEM/ODM available.

Q: Our Advantage?

A: 30 years experience, Advanced production equipments, Stable quality, Fast delivery, Professional & good & Prompt service.Also some free parts can be provided.

Q: How long is your delivery time?

A: it is depends on your quantity,generally within 15-20 days upon receipt of the advance payment.

Q: What is your payment terms?

A : T/T, L/C,Visa Paypal ,Weatern Union for different circumstances.

Q: Do you have inspection procedure before shiping?

A: Yes,we do 100% QC inspection

Q: What certificates do you have？

A: CESGS ISOIEC StandardsGost Certificates.

Long-term strategic partnerships with DuPont, ABB, Siemens, etc.

Q:AS we knew, when we make order, some suppliers used lower material insted of high quality material products and send to us, how can i trust you?

A: we suggest clients to test the material after receiving goods. We aim to do long term business, not one times.

TSTYNICE transformers hold ISO 9001, IEC 60076, CE, GOST, SGS, and BV certifications, with 158 patents (20 inventions). Our CNAS-accredited lab ensures global compliance across 80+ markets.