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35KV 3150KVA Three Phase Low Loss Distribution Transformer

35KV 3150KVA Three Phase Low Loss Distribution Transformer

Presenting our 35KV 3150KVA Three Phase Low Loss Distribution Transformer—a cutting-edge solution engineered with advanced oil-immersed technology to achieve exceptionally low no-load and on-load losses. Designed in strict adherence to standards such as ANSI C57.12.00, IEC 60076, GB 1097, and GB/T6451, this transformer features a premium C.R.G.O. core and oxygen-free copper windings for precise voltage control and enhanced durability. Tailored for high-voltage industrial applications and urban substations, our transformer delivers a sleek, reliable, and safe power distribution solution that meets the demanding energy needs of modern infrastructure.

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Product Accessories

Core (Magnetic Circuit System)
Material: Made of high-permeability cold-rolled silicon steel sheets (e.g., 30ZH120 or higher grade), precisely stacked with staggered joints to reduce magnetic resistance and eddy current losses.
Features: Low no-load losses (S13 model reduces losses by approximately 30% compared to older models) and a noise-free laminated design.

Winding (Electrical Circuit System)
High-Voltage Winding: The 35kV side typically adopts a multi-layer cylindrical or continuous structure, using copper (or aluminum) conductors wrapped with insulating paper to enhance short-circuit withstand capability.
Low-Voltage Winding: The 0.4kV side often employs a foil winding structure to minimize eddy current losses and improve efficiency.
Insulation: Nomex paper or DMD insulation material combined with a vacuum pressure impregnation (VPI) process to enhance the thermal rating (H-class or F-class).

Insulation & Cooling System
Insulating Oil: Uses naphthenic mineral oil or environmentally friendly synthetic ester oil, providing high dielectric strength and oxidation resistance.
Cooling Structure: Equipped with fin-type radiators or a corrugated oil tank, utilizing natural convection cooling (ONAN), eliminating the need for additional fans and reducing maintenance requirements.

Tank & Sealing System
Tank: Fully sealed corrugated steel tank that accommodates thermal expansion and contraction of the oil, ensuring a maintenance-free design.
Protection Rating: IP55 or higher, offering dustproof and waterproof capabilities, suitable for harsh outdoor environments.

Protection Devices
Gas Relay (Buchholz Relay): Monitors internal faults by detecting gas accumulation, triggering alarms or tripping mechanisms.
Pressure Relief Valve: Automatically releases excessive pressure to prevent oil tank rupture.
Sudden Pressure Relay: Quickly responds to internal arc faults by disconnecting the power supply.

Tap Changer
Off-Load Tap Changer (OLTC or NLTC): Provides ±5% or ±2×2.5% voltage adjustment, typically located on the high-voltage side, manually operated to accommodate grid fluctuations.

Bushings & Terminals
High-Voltage Bushings: Porcelain or composite insulated bushings (e.g., silicone rubber) rated for 35kV, with creepage distance meeting IEC standards.
Low-Voltage Bushings: Resin-cast bushings with an anti-pollution flashover design.

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Product Specifications

Rated Capacity

3150kVA（3.15MVA）

Rated Voltage

High Voltage Side 35kV ±5%

Low Voltage Side 0.4kV

No-Load Loss (P₀)

≤2.1kW

Load Loss (Pₖ)

≤23kW (at 120℃)

Short-Circuit Impedance (Uk%)

6% or 4.5% (optional)

Efficiency

≥99% (at full load)

Insulation Level

High Voltage Side LI200kV / AC85kV

Low Voltage Side LI75kV / AC35kV

Cooling Method

ONAN (Oil Natural Air Natural)

Vector Group

Dyn11

Noise Level

≤55dB(A) (no-load, measured at 1m distance)

Product Applications

Economy is more affordable

Ideal for large business centers and shopping malls requiring stable, efficient power distribution.

Commercial & Retail Complexes
Provides dependable, uninterrupted power to hospitals and emergency centers where reliability is critical.

Healthcare & Emergency Facilities
Supports high-demand digital infrastructures with continuous, efficient energy supply.

Telecommunications & Data Centers
Integrates seamlessly into modern urban developments, enhancing smart grid performance and sustainable energy management.

Smart City Infrastructure

Product Advantages

Energy-Saving Architecture

Engineered to significantly reduce transmission losses, thereby lowering operating costs and improving overall efficiency.

Extended Durability

Constructed with high-quality materials and advanced technology to ensure reliable performance and a prolonged service life in challenging environments.

Effortless Integration

Designed for seamless compatibility with existing grid systems, simplifying installation and maintenance while ensuring optimal operational performance.

WellDone Power Transformer Plan Drawing

FAQ

What range of transformer products do you offer and which standards do they meet?

We manufacture a diverse array of transformers including Oil-Immersed Distribution Transformers, Dry Type Transformers, Power Transformers, Three Phase Pad Mounted Transformers, Single Phase Pad Mounted Transformers, Substation Transformers, and Pole Mounted Transformers. Our technical team, with nearly 20 years of industry experience, ensures that our designs comply with international standards such as ANSI, IEEE, DOE, CSA, AS, AZS, GOST, IEC, and more. Additionally, many of our products have obtained UL, cUL, and CSA certifications, affirming their safety and performance in global markets.
How do you ensure the quality and reliability of your transformers?

Our transformers are produced under a rigorous quality management system covering every stage from material selection to final testing. Each product comes with a minimum 24-month warranty, ensuring long-term safety and reliability. This commitment to quality has earned the trust of global customers and leading industry players.
What are your production lead times, customization options, and global market reach?

For standard models, our production lead time is typically 10 to 25 days, and we offer flexible OEM/ODM services for customized projects. We also tailor packaging solutions to meet specific customer requirements. Our transformers are exported worldwide—including North America, Europe, South America, Australia, Asia, and Africa—with successful partnerships involving renowned companies. For more details or personalized support, please contact us via email or WhatsApp.