Oil-immersed power transformer

Beautiful appearance, advanced technology, reliable Operation

Reliable and Durable Oil-filled Transformer Solutions

As one of the trusted manufacturers of oil-immersed power transformers, we specialize in designing, testing, and producing transformers that meet the highest standards of performance and reliability. With decades of engineering expertise, our team is committed to continuous innovation, strict quality control, and professional customer service.

Our product portfolio includes S11, S13, S18, S20, and S22 series oil-immersed power transformers, suitable for three-phase 50Hz and 60Hz power grid systems. They are widely used for primary input and secondary output in power networks, and are engineered for high efficiency, low loss, and long-term stable operation.

Ensuring dependable power is crucial for utility substations, industrial facilities, renewable energy projects, and commercial applications. We deliver tailored transformer solutions that comply with both international and national standards, including IEC60076, GB/T6451, GB1094, and GB20052-2024. With efficient production and reliable logistics, we guarantee timely delivery to support your projects on schedule.

Industry-Leading Lead Times

1 Week RFQ Lead Times

2-4 Weeks Drawing Approval

6-8 Weeks Delivery

Transformateur de distribution immergé dans l'huile

Fonctionnant sur le principe de l'induction électromagnétique, ce transformateur convertit efficacement la tension et le courant alternatifs pour faciliter la transmission et la distribution de l'énergie électrique. Il est constitué d'un noyau fermé en fer laminé enroulé avec deux ou plusieurs enroulements isolés de nombres de tours différents. Lorsque l'enroulement primaire est alimenté par une alimentation en courant alternatif, un flux magnétique alternatif est généré dans le noyau. Ce flux induit une force électromotrice dans l'enroulement secondaire, ce qui permet de transformer la tension en fonction du nombre de tours entre les enroulements tout en assurant une transmission efficace de l'énergie.

Caractéristiques de la distribution immergée dans l'huile

Milieu isolant : Utilise de l'huile minérale ou de l'huile diélectrique synthétique comme principal moyen d'isolation et de refroidissement. Structure étanche : Les enroulements et le noyau de fer sont entièrement immergés dans l'huile et scellés hermétiquement dans un robuste réservoir en acier.
Conception de la dissipation de la chaleur : Le réservoir est équipé d'ailettes de refroidissement, de tubes ou de radiateurs à l'extérieur, facilitant la dissipation de la chaleur par une circulation naturelle ou forcée de l'huile.
Dispositifs de protection : Ils comprennent généralement un conservateur (vase d'expansion de l'huile), un reniflard, un relais Buchholz et une soupape de sûreté pour assurer la surveillance du fonctionnement et la protection de la sécurité.
Coût des matériaux : Le coût des matériaux est relativement faible car ils sont essentiellement fabriqués à partir de carton comprimé isolant et d'acier.

Fiche technique des transformateurs de distribution immergés dans l'huile

Spécifications	Détails
Conditions d'installation	Extérieur
Modèle	Série S, SZ
Plage de capacité	30-31 500 kVA
Tension nominale	Haute tension (kV) : 6, 6.6, 10, 11, 12.47, 13.2, 13.8, 15, 20, 22, 25, 33, 34.5, 35, 38.5 Basse tension (kV) : 0.38, 0.4, 0.415, 0.433, 0.48, 0.69, 0.72 Prise en charge des spécifications personnalisées
Impédance	4-10%
Classe d'isolation	Classe A
Groupe Vecteur	Dyn11, Yyn0, Yd11, YNd11
Niveau d'isolation	10kV : LI75 AC35 / AC5 20kV : LI125 AC50 / AC5 35kV : LI170 AC70 / AC5
Normes de conformité	EN 60076, IEC 60076, CE

Avantages de la solution des transformateurs à bain d'huile

1. Excellente dissipation de la chaleur et forte capacité de surcharge : L'huile isolante offre une conductivité thermique élevée, ce qui permet de gérer efficacement les conditions de surcharge à court terme.
2. Fiabilité élevée et longue durée de vie : La structure scellée et immergée dans l'huile empêche efficacement le vieillissement de l'isolation, avec une durée de vie supérieure à 20 ans.
3. Rentabilité et faibles coûts d'exploitation : Les coûts de fabrication et d'acquisition sont plus compétitifs que ceux des transformateurs de type sec, en particulier dans les applications de grande capacité.

4. Large gamme de capacités : Capable de supporter de grandes capacités (jusqu'à des dizaines de MVA) et des niveaux de tension élevés (par exemple, plus de 35 kV) avec une relative facilité.
5. Technologie mature et entretien facile : Avec un siècle de développement, le système technologique de maintenance, de diagnostic et de réparation est très avancé et bien établi.
6. Faible bruit de fonctionnement : La structure de l'huile et du réservoir permet d'amortir les vibrations électromagnétiques, ce qui permet un fonctionnement relativement silencieux.

Oil-immersed Wind Power Transformer

The oil-immersed wind power transformer is specifically designed for harsh operating environments in wind farms. It is typically installed inside the wind turbine tower or on the base platform. Its primary function is to step up the low voltage generated by the wind turbine (e.g., 0.69 kV or 35 kV) to a higher grid transmission voltage (e.g., 35 kV or 110 kV), thereby reducing energy loss during power transmission.

Oil-immersed Wind Power Transformer Features

Environmental Adaptability: Excellent weather resistance, designed to withstand harsh conditions including high humidity, salt spray (for offshore wind power), windblown sand, and extreme temperature variations.
High Short-Circuit Withstand Capability: Utilizes high-strength electromagnetic wire and specialized winding techniques to endure frequent load fluctuations and grid disturbances in wind power systems.
Compact Design: Features a space-saving structure with a relatively small footprint to meet strict installation constraints within wind turbine towers or on platform bases.
Superior Sealing Performance: Hermetically sealed construction or equipped with pressure relief devices to prevent moisture and air ingress, delay insulation aging, and extend maintenance-free operation periods.
Outstanding Overload Capacity: Designed to accommodate short-term overloads during periods of high wind energy availability, maximizing energy utilization efficiency.
Low Loss Characteristics: Manufactured with high-quality silicon steel cores and advanced engineering to minimize no-load and load losses, complying with energy efficiency and environmental requirements.

Oil-immersed Wind Power Transformer Data Sheet

Spécifications	Détails
Conditions d'installation	Outdoor installation
Modèle	S Series
Plage de capacité	1,000‒12,500 kVA
Tension nominale	Haute tension (kV) : 33, 34.5, 35, 36.5, 37, 38.5 Basse tension (kV) : 0.69, 1.14 Prise en charge des spécifications personnalisées
Impédance	6.5‒10%
Classe d'isolation	Classe A
Groupe Vecteur	Dy11
Niveau d'isolation	35 kV: LI 170 AC 70 / AC 5
Normes de conformité	EN 60076, IEC 60076, CE

Oil-immersed Wind Power Transformer Solution Advantages

1. High Reliability: Specifically engineered for the unique demands of wind power applications, featuring a robust internal structure and extremely low failure rates to ensure long-term stable operation of wind farms.
2. Long Service Life: Excellent sealing and insulation systems effectively delay aging, with a design lifespan that matches that of wind turbines (typically 20–25 years).
3. Low Maintenance Requirements: The fully sealed design requires virtually no maintenance, greatly the frequency of tower access and lowering lifecycle maintenance costs.

Oil-Immersed PV Transformer

The oil-immersed PV transformer is a critical transmission and distribution equipment in PV power stations. It is typically installed within pad-mounted substations (PV-compatible compact substations) or deployed as a standalone unit. Its primary function is to step up the medium voltage output from PV inverters (e.g., 0.8 kV or 35 kV) to the grid transmission voltage level (e.g., 35 kV or 110 kV), enabling efficient grid integration. Serving as a “key gateway,” it plays an essential role in delivering clean solar energy to the power grid.

Oil-immersed PV Transformers Features

High-Temperature Resistance: Designed for the significant daily temperature variations and high daytime heat in PV power stations, the transformer oil and insulation system deliver excellent high-temperature endurance.
Strong Overload Capacity: The design accommodates full-load and even short-term overload operation during peak sunlight hours, as well as extreme duty cycles like nighttime no-load conditions.
Harmonic Handling Capability: Utilize Special design and materials to withstand specific harmonic currents generated by PV inverters, preventing local overheating.
High Sealing Performance: A fully sealed structure or devices equipped with pressure relief effectively prevents the intrusion of moisture, dust, and salt spray (suitable for coastal/desert power plants), making it ideal for harsh outdoor environments.
Energy Efficiency with Low Losses: Specially optimized for low no-load loss (during nighttime and periods without sunlight), along with reduced load loss, aligning with the core requirements of energy conservation and efficiency in PV power plants.
High Reliability: Robust construction and high-quality internal materials ensure long-term, stable operation in unmanned PV power stations.

Oil-Immersed PV Transformer Data Sheet

Spécifications	Détails
Conditions d'installation	Outdoor installation
Modèle	S-Series
Rated Capacity	1,000–8,000 kVA
Tension nominale	Haute tension (kV) : 10.5, 33, 34.5, 35, 36.5, 37, 38.5 Low Voltage: 0.4, 0.8, 1.14 Prise en charge des spécifications personnalisées
Impédance	6.5–10%
Classe d'isolation	Classe A
Groupe Vecteur	Dy11, Yd11
Niveau d'isolation	35 kV: LI 170 AC 70 / AC 5
Normes de conformité	EN 60076, IEC 60076, CE

Oil-Immersed PV Transformer Solution Advantages

1. Cost-Effectiveness, Better Value: Compared to dry-type transformers, oil-immersed transformers offer lower manufacturing and procurement costs at equivalent capacity, making them an economical choice for large and medium-sized PV power stations.
2. Minimal Maintenance, Extended Lifespan: With a rugged sealed construction and stable oil-paper insulation system, these transformers are virtually maintenance-free and designed to last over 25 years—making them a durable match for the lifecycle of solar power stations.
3. High Efficiency, Higher IRR: Reduced no-load and load losses directly decrease the station’s internal power consumption (auxiliary power rate), increasing both energy generation and overall investment return rate (IRR).

Oil-Immersed ESS Transformer

The Oil-Immersed ESS Transformer is a critical hub device in Battery Energy Storage Systems (BESS), primarily enabling bidirectional energy transfer and voltage conversion. During charging, it steps down the grid’s high voltage to a level suitable for the Power Conversion System (PCS) input. During discharging, it steps up the PCS output voltage to match the grid voltage. Serving as the core link between the battery units and the grid, it plays a vital role in ensuring the efficiency, safety, and stability of the energy storage system.

ESS Transformer Features

Bidirectional Operation Design: Specifically engineered for frequent and rapid charge-discharge cycles, delivering high efficiency and reliability in both operating modes.
Exceptional Overload Capacity: Capable of withstanding short-term high-current impacts and frequent load fluctuations caused by peak shaving and frequency regulation in energy storage systems.
High Harmonic Tolerance: Designed with specialized materials and construction (e.g., reduced eddy current losses) to endure high levels of harmonic currents generated by PCS operation, preventing localized overheating and additional losses.
High Reliability Requirements: Designed to exceed standard distribution transformer requirements to ensure long-term, stable operation in unmanned energy storage stations and minimize downtime.
High Energy Efficiency: No-load and load losses are optimized—particularly in common operating ranges—since even minor losses directly affect the round-trip efficiency of the energy storage system.
Excellent Thermal Management: The oil-immersed design ensures superior heat dissipation, effectively managing internal temperatures under bidirectional and heavy-load conditions to preserve insulation integrity and service life.

Oil-Immersed ESS Transformer Data Sheet

Spécifications	Détails
Conditions d'installation	Extérieur
Modèle	S Series
Capacity	1,000–8,000 kVA
Tension nominale	Haute tension (kV) : 10, 11, 20, 22, 33, 34.5, 35, 36.5, 37, 38.5 Basse tension (kV) : 0.4, 0.6, 0.69, 0.8 Prise en charge des spécifications personnalisées
Impédance	4.5–10%
Classe d'isolation	Classe A
Groupe Vecteur	Dy11
Niveau d'isolation	35 kV: LI 170 AC 70 / AC 5
Normes de conformité	EN 60076, IEC 60076, CE

Oil-Immersed ESS Transformer Solution Advantages

1. Improved System Efficiency, Increased ROI: The low-loss design minimizes energy waste during conversion, enhancing the charge-discharge efficiency of the energy storage system and directly increasing the economic returns of the power station.
2. Adaptability to Demanding Conditions, High Stability: With a robust structure and specialized engineering, it performs reliably under harsh operating modes such as frequent switching and drastic load changes, ensuring safety and stability on both grid and battery sides.
3. Lower Lifecycle Cost (TCO): Features a lower initial investment compared to dry-type transformers, combined with minimal maintenance requirements, resulting in significant total cost of ownership (TCO) advantages over its lifespan.

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