S13-3150kVA Oil-Immersed Transformer

Henan GNEE Electric Co., Ltd. is one of the most reliable manufacturers and suppliers of s13-3150kva oil-immersed transformer in China. If you're going to buy customized s13-3150kva oil-immersed transformer made in China, welcome to get quotation from our factory. Quality products and reasonable price are available.

 

This S13-3150kVA oil-immersed power transformer in our workshop adopts high-performance oriented silicon steel core, featuring ultra-low no-load loss, high energy efficiency and stable running performance.

 

Equipped with large-area corrugated radiators and an overhead conservator, it delivers excellent heat dissipation, stable temperature control and long service life, perfectly adapting to high-load continuous operation for industrial parks, mining projects and power grid stations.

 

The fully sealed oil tank structure effectively prevents moisture and dust ingress, with complete protective accessories to ensure safe and reliable long-term grid power transformation.

 

 

GNEE Electric manufactures S13-3150kVA oil-filled transformers that comply with GB 1094, GB/T 6451 and can also be customized to IEC 60076 requirements. Featuring Class 2 energy efficiency, low losses, reliable overload capability and complete factory testing, they are widely used in utility, renewable energy and heavy industrial applications.

 

Looking for a high-efficiency 3150kVA oil-immersed transformer for solar power plants, substations, mining, or industrial projects? Tell us your specs and get a detailed quote within 24 hours.

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The S13-3150/35 oil-immersed power transformer is designed for medium-voltage distribution networks, renewable energy projects, industrial plants, and utility substations. Manufactured in accordance with GB 1094 and GB/T 6451, it offers high energy efficiency, reliable operation, and flexible customization for different voltage systems and project requirements.

 

The following specifications are based on a standard 35kV/1kV configuration. Customized ratings, vector groups, impedance values, and accessories are available upon request.

 

Item	Specification
Transformer Model	S13-3150/35
Rated Capacity	3150 kVA
Transformer Type	Three-Phase Oil-Immersed Distribution Transformer
Applicable Standards	GB 1094, GB/T 6451
Rated Frequency	50 Hz (60 Hz Optional)
Number of Phases	Three Phase
Cooling Method	ONAN
Installation	Outdoor
High Voltage	35 kV
HV Tap Changer	Off-Circuit Tap Changer ±2 × 2.5%
Tap Positions	36.75 kV / 35 kV / 33.25 kV
Low Voltage	1 × 2 kV
Vector Group	Dyn11
Short-Circuit Impedance	6.8%
Insulation Level	LI75 AC35
No-Load Loss	≤2260 W
Energy Efficiency	GB 20052-2020 Tier 2
Partial Discharge	≤50 pC
Noise Level	≤55 dB(A) @ 1 m
Magnetic Flux Density	≤1.65 T
Winding Material	99.95% Oxygen-Free Copper
Core Material	High-Permeability Grain-Oriented Silicon Steel
Insulating Oil	No.25 Naphthenic Transformer Oil
Core & Coil Weight	4,020 kg
Oil Weight	1,475 kg
Total Weight	7,630 kg

 

Customization Available: Rated voltage, frequency (50/60 Hz), vector group, impedance, tap changer, cooling method, terminal arrangement, accessories, enclosure finish, and other specifications can be customized to meet project requirements.

 

Click to Download Full Specification Sheet

 

 

1. Sealed Corrugated Tank Reduces Maintenance Costs by Over 60%

The sealed corrugated tank with a hermetic oil preservation system uses flexible corrugated fins to compensate for oil volume changes, preventing moisture and dust ingress while maintaining stable moisture content in the insulating oil. Oil testing and replacement intervals are significantly extended, reducing maintenance costs by more than 60% compared with conventional transformers. It is ideal for outdoor, remote, and unattended applications.

 

2. High-Purity Oxygen-Free Copper Windings for Lower Losses and Reliable Overload Capacity

The windings are made of 99.95%+ high-purity oxygen-free copper with an electrical resistivity of ≤0.01724 Ω·mm²/m, providing conductivity superior to the International Annealed Copper Standard (IACS). The transformer can operate continuously at 110% of rated load for 2 hours while keeping temperature rise within the national standard limits. 100% copper windings are guaranteed in the contract, and random inspection upon delivery is supported to eliminate the use of aluminum or copper-clad aluminum conductors.

 

3. GB 20052-2020 Tier 2 Energy Efficiency for Lower Power Consumption

With a measured no-load loss of ≤2260 W, the transformer complies with the Tier 2 energy efficiency requirements of GB 20052-2020. Compared with the S9 series, it saves approximately 8,000–12,000 kWh of electricity per year (based on 8,000 operating hours and a 60% load factor). Certified energy efficiency reports help ensure smooth utility acceptance, as well as PV/ESS project registration and subsidy approval.

 

4. Multi-Layer Composite Insulation for Excellent Short-Circuit Strength

The insulation system combines Class A insulating paper with No. 25 naphthenic transformer oil. Partial discharge is ≤50 pC at 1.5 times the rated voltage. The reinforced core-and-coil assembly withstands 25 kA short-circuit current for 2 seconds, providing excellent resistance to motor starting and arc-induced electrical shocks while significantly reducing the risk of short-circuit damage.

 

5. Low-Noise Design Reduces Noise-Control Investment

The transformer adopts a five-step fully mitered core with a magnetic flux density of ≤1.65 T. The measured noise level is ≤55 dB(A) at a distance of 1 meter, exceeding national standard requirements. It can be installed near factory boundaries, residential areas, and schools without additional soundproofing, reducing both civil construction and noise-control costs.

 

 

 

Ready to lower your project's energy costs with an S13‑3150kVA transformer?

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Suitable for
✔ 2–3MW Solar Plants
✔ Wind Farms
✔ BESS (Battery Energy Storage Systems)
✔ Mining Operations
✔ Steel Plants
✔ Cement Plants
✔ Large Manufacturing Facilities

 

 

The 3150kVA rating offers an excellent balance between capacity, efficiency, and investment cost, making it one of the most widely specified medium-power distribution transformers worldwide. It provides enough power to reliably supply a medium‑sized industrial plant or a renewable energy installation, while keeping both no‑load and load losses within an economically optimal range. When built with a hermetically sealed tank and high‑purity copper windings, as in modern S13‑series designs, this transformer delivers decades of low‑maintenance operation, easy integration with 10kV or 35kV networks, and a total ownership cost that is hard to beat for continuous‑duty applications.

 

 

Choosing the right transformer supplier is as important as selecting the transformer itself. GNEE Electric combines standardized manufacturing, strict quality control, and responsive technical support to deliver reliable power transformers for utility, industrial, and renewable energy projects worldwide.

 

Complete In-House Manufacturing

From silicon steel core processing and copper winding production to tank fabrication, assembly, testing, and final inspection, every key manufacturing process is completed in-house to ensure consistent quality and shorter production lead times.

 

 

Strict Quality Control

Every transformer undergoes comprehensive routine factory testing before shipment, including no-load loss, load loss, insulation resistance, induced voltage, power-frequency withstand voltage, and other electrical performance tests to ensure compliance with applicable standards.

 

 

Customized Engineering Solutions

We provide customized transformer solutions based on project requirements, including rated voltage, capacity, frequency, vector group, impedance, tap changer configuration, cooling method, and optional accessories.

 

Reliable Export Experience

Our transformers have been supplied to customers across Asia, Africa, the Middle East, Europe, and South America for applications including substations, photovoltaic power plants, mining, manufacturing, and industrial distribution systems.

 

GNEE Electric Oil Immersed Transformers for Global Engineering Projects 

Comprehensive Documentation

Each transformer is supplied with a factory test report, certificate of conformity, nameplate data, and other required technical documents. Third-party inspection and witness testing are available upon request.

 

Professional Technical Support

Our engineering team provides technical consultation before ordering and responsive after-sales support throughout installation, commissioning, and operation.

 

 

GNEE Electric oil-immersed transformers are manufactured in strict accordance with GB 1094 transformer standards and GB/T 6451 technical specifications. Backed by GNEE's standardized production line, every process-from precision cutting of high-permeability silicon steel, low-loss step-lap core assembly, and high-precision pure copper winding, to automatic vacuum varnish impregnation, constant-temperature drying, and precision sealing and welding of corrugated tanks-is subject to dedicated quality inspections to strictly control process tolerances and eliminate manufacturing defects.

 

Before shipment, every GNEE Electric oil-immersed transformer undergoes a complete set of routine factory tests, including no-load loss, load loss, power-frequency withstand voltage, induced withstand voltage, insulation resistance, and partial discharge, ensuring that all performance parameters fully meet the specified requirements. Each transformer is supplied with a complete factory test report, certificate of conformity, and Tier 2 energy efficiency test documentation. Third-party factory inspection, witness testing, and on-site grid connection re-inspection are supported, ensuring stable and reliable product quality that fully meets the acceptance requirements for utility grids, industrial projects, and photovoltaic and energy storage applications.

 

Professional Transformer Manufacturer and Supplier – GNEE Electric Factory

 

Packing and Delivery

Core Protection:‌ The transformer unit is encased in a high-strength, corrosion-resistant wooden crate. Both inner and outer layers are covered with waterproof and moisture-proof membranes, effectively isolating the unit from rainwater, humidity, and dust.

 

 

What Is the Standard Impedance of a 3150kVA Transformer?
Typically 6%–8%. Our S13-3150/35 transformer has a standard impedance of 6.8%, with custom values available on request.

 

Which Vector Group Is Commonly Used for a 3150kVA Transformer?
Dyn11 is the most common, providing a grounded low-voltage neutral and reliable performance for industrial and utility distribution. Other groups can be customized.

 

What Is the Weight of a 3150kVA Transformer?
Total weight is approximately 5,000–8,000 kg, depending on voltage rating, design and accessories.

 

What Is the No-Load Loss of a 3150kVA Transformer?
For S13-3150kVA, no-load loss is ≤2,260W, meeting GB 20052-2020 Class 2 energy efficiency standards.

 

How Much Copper Is Used in a 3150kVA Transformer?
Typically 1,000–1,500 kg of high‑purity copper, depending on voltage and winding configuration.

 

What Is the Difference Between a 2500kVA and 3150kVA Transformer?
The 3150kVA unit delivers 26% more capacity, making it suitable for larger loads or future expansion, with slightly larger dimensions and weight but comparable efficiency levels.

 

What is the price of a 3150kVA oil-immersed transformer?
The price varies with voltage, frequency, vector group, impedance, tap changer, accessories and destination. Contact us with your project specifications for a customized quotation.

 

Still have questions? Speak directly with a transformer specialist - click to start a live chat or leave your inquiry, and we'll reply within one business hour.

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When choosing our company's products, please provide the following data to better serve you.
Demander
Demander:	Telephonemethods:	Fax:
Project technical leader:	Telephonemethods:	Mailbox:
Transformer type selection
□Dry transformer {□SC(B) Epoxy resin □SC(B) Non-encapsulated} □American Box(ZGS) {□Terminal type(-Z-) □Ring network type(-H-)} □European Box change(YBM){□ Dry change □Oil change}	□ Oil-immersed transformer{□ Fully sealed(-M-) □Oil-bearing pillow} □Amorphous alloy transformer{□Dry amorphous □ Oil amorphous} □ Special transformer{Rectifier, Furnace, Mine, Etc}

Transformer basic data selection

Country of use:
Phase number:	□Three-phase(S conventional) □ Monophase □Other( )
Frequency:	□50Hz(conventional) □60Hz □ Other( )
Transformer oil:	□#25(conventional) □#45(minimum temperature below-25℃)
Rated capacity:	□( )kVA Conditions of use □Outdoor type □Indoor type
Altitude:	□Less than 1000m(conventional) □1000-2000m □3000m以上 over
Rated voltage(High voltage)	□6kV □10kV □20kV □35kV □66kV □110kV □220kV □Other( )
Rated voltage(Low pressure)	□0.4kV □0.66kV □10kV □10.5kV □35kV □其他 Other( )
Connected group	□Dyn11(conventional) □Yyn0 □YNd11 □li0(Single-phase) □Other( )
Impedance(%):	□4% □4.5% □5.5% □6% □6.5% □7.5% □8% □Other( )
Voltage regulation mode	□Voltage regulation without excitation(conventional) □On-load voltage regulation(Z)
Voltage regulation range	□±2*2.5% □±5% □±3*2.5% □Other( )

Transformer accessory selection

□Fan □Temperature control{□ Common □With 485 computer interface} □Dry case{□ Ordinary steel sheet □Aluminum alloy » Stainless steel} □Protection level of dry case(□IP20(Conventional) □IP( )} □Dry case height requirements{□None □Requirements[ ]} □ Cable out mode of the dry variable shell {□ Up-and-out □ Up-and-down □Down-in/DOWN-out □Down-in/UP-out □Down-in/DOWN-out □Down-in/ side-out [□Left □ Right-out]}

Note: 1. (Dry change requirements s 100kVA transformer does not include fans, such as fans, need to be charged 2. (Oil changes <630kVA transformer does not include temperature control, gas relay, if necessary, need to increase the fee)

Other special requirements(additional charges apply below)

Dry transformer	□Shell and bottom plate{□Ordinary □Fully sealed} □Travel switch □Magnetic lo □Zero sequence transformer □Copper bar to the low voltage cabinet □Protective mesh □Lighting □100kVA or less Fan □Shock absorber
Oil-immersed transformer	□No.45 oil for non-low temperature areas □Designated brand on-load voltage regulator □400kVA and below low voltage outlet OABC phase with wiring terminals □630kVA or below requires temperature control □800kVA or below Low voltage outlet phase 0 requires wiring terminals □630kVA and below must be equipped with gas relay

 

No matter where your project is located, GNEE Electric delivers. Request your 3150kVA transformer quote now and join 300+ projects worldwide that trust our power solutions.

 

 

Asia:China, Philippines, Cambodia, Malaysia, Myanmar, Indonesia, Vietnam, Mongolia, Japan, Taiwan Province, Bangladesh, Sri Lanka, Lebanon, Saudi Arabia, Turkey, Armenia, Iraq, Iran, Kazakhstan, Kyrgyzstan, Tajikistan, Uzbekistan

 

Africa:Egypt, Ethiopia, Angola, Botswana, Burundi, Cape Verde, Congo, Guinea, Ghana, Gabon, Zimbabwe, Cameroon, Kenya, Rwanda, Malawi, Mauritius, Mauritania, Mozambique, South Africa, Nigeria, Somalia, Chad, Central Africa

 

North America: Aruba, Panama, Dominican Republic, Costa Rica, Honduras, Caribbean region,Canada, United States, Mexico, El Salvador, Guatemala, Jamaica

 

Europe: Bulgaria, North Macedonia, Finland, Norway, Ukraine, Greece, Hungary, Italy, United Kingdom

 

South America: Argentina, Paraguay, Ecuador, Colombia, Guyana, Venezuela, Uruguay, Chile

 

Middle East: The Middle East region

 

Oceania: Australia, Papua New Guinea. Fiji

 

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