• Product advantages
• Product parameters
• Ordering instructions

Product advantages

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Key Advantages of our 35kV Three-Phase Oil-Immersed Power Distribution Transformer

• Leading-Edge Winding Technology: Engineered with advanced high-voltage copper tape winding and low-voltage copper foil winding, this 35kV three-phase oil-immersed power distribution transformer delivers unmatched lightning impulse resistance and features premium Class-A insulation materials.

• Superior Mechanical Strength: Designed with low magnetic leakage and exceptional short-circuit withstand capability, our 35kV three-phase oil-immersed power distribution transformer ensures ultimate grid stability.

• Advanced Step-Lap Core Structure: Utilizing a 45° full-oblique joint step-laminated core structure, this 35kV three-phase oil-immersed power distribution transformer significantly lowers operational noise and no-load losses.

Precision-Engineered Tank & Enclosure

• State-of-the-Art CNC Fabrication: The tank of the 35kV three-phase oil-immersed power distribution transformer is processed using top-tier Mitsubishi laser cutting machines and advanced CNC punching and bending equipment to guarantee flawless dimensional accuracy.

• Robot Automatic Welding & Zero-Leakage: Featuring ABB robotic automatic welding and high-precision laser detection, the enclosure eliminates any risk of oil leakage, boasting an extraordinary quality qualification rate of 99.99998%.

• 50-Year Ultra-Durable Coating: Treated with premium electrostatic powder spraying, the anti-corrosion coating system offers exceptional hardness ($\ge 0.4$) and salt spray resistance within 100h, promising up to 50 years of paint durability.

• Fully Sealed & Maintenance-Free: The fully sealed structure protects the cooling medium from aging, offering a maintenance-free service life exceeding 30 years for the 35kV three-phase oil-immersed power distribution transformer.

High-Efficiency Iron Core & Coils

• Premium Silicon Steel Core: The iron core of our 35kV three-phase oil-immersed power distribution transformer is built from high-quality, cold-rolled grain-oriented (CRGO) silicon steel sheets with mineral oxide insulation (sourced from industry giants like Baosteel and Wisco). By controlling precision cutting and stacking, we minimize no-load current and acoustic noise.

• Patented Winding Innovation: While the low-voltage coils utilize high-grade copper foil for excellent insulation resistance, the high-voltage windings leverage Hengfengyou Electric’s patented technology using insulated copper wire, providing supreme resistance to radial stresses caused by short circuits.

• Structural Reinforcement: The entire core and coil assembly is specially reinforced to withstand rigorous vibrations during transportation and normal grid operations.

Top-Tier Raw Materials & Components

To ensure the premium quality of each 35kV three-phase oil-immersed power distribution transformer, we only source from world-class suppliers:

• Core Sheets: Baosteel & Wisco high-permeability CRGO silicon steel.

• Conductors: Premium-grade Chinese anaerobic (oxygen-free) copper.

• Insulating Oil: CNPC (PetroChina Kunlun Petroleum) High-Quality 25# Transformer Oil.

Technical Configurations & Safety Standard

• Tinned Copper Connections: Equipped with high-conductivity tinned copper bars for low-voltage outgoing terminals, and robust ring tinned bolts for high-voltage outlet terminals.

• Flexible Tap Changer Options: Standard configuration features a 5-step or 7-step Off-Circuit Tap Changer (NLTC), with On-Load Tap Changer (OLTC) available for customization.

• Advanced Gas Relay Protection: For units rated above 630 kVA, high-sensitivity gas relays are installed as standard to ensure real-time safety monitoring for the 35kV three-phase oil-immersed power distribution transformer.

Why Choose Hengfengshuai 35kV Three-Phase Oil-Immersed Power Distribution Transformer?

As the core power hub for modern green grids and low-carbon industrial projects, choosing Hengfengshuai means choosing a higher grid return on investment (ROI) and significantly reduced operational risks.

Thanks to Hengfengyou Electric's proprietary "Ultra-Low Loss Energy-Saving Power Transformer" patented technology, every Hengfengshuai 35kV three-phase oil-immersed power distribution transformer achieves a 5% saving in raw materials. Compared to standard market alternatives, its comprehensive operational losses are reduced by 10% to 20%.

Whether for urban grid upgrades, large industrial parks, renewable energy plants like wind and solar, or long-distance international transport projects, the Hengfengshuai 35kV three-phase oil-immersed power distribution transformer is your ultimate eco-friendly, energy-saving, and cost-effective turnkey high-voltage power solution.

Product parameters

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  - Input voltage: 35kV

  - Output voltage: 0.4kV
  - Capacity: 50-5000 kva
  - Frequency: 50HZ/60HZ
  - Voltage regulation mode: NLTC (no Load tap changer)
  - Remark: voltage, capacity, frequency, connection group and loss can be customized according to customer requirements

额定容量Capacity	额定电压及分接范围Rated voltage&Off-load tapping				联结组标号 Vector  GroupSymbol		空载损耗 NO-load loss（W）	负载损耗 Load loss（W）	空载电流 NO-load current	短路阻抗Short  circuit impedance(%)
	高压 H.V(kv)	高压分接范围  High pressure   Tap range（%）		低压 L.V(kv)
50 kva	33kV 35kV 38.5kV	±5% ±2x2.5%		0.4	Dyn11 Yyn0		210	1270/1210	2.0	6.5
100 kva							290	2120/2020	1.8	6.5
125 kva							340	2500/2380	1.7	6.5
160 kva							360	2970/2380	1.6	6.5
200 kva							430	3500/3330	1.5	6.5
250 kva							510	4160/3960	1.4	6.5
315 kva							610	5010/4770	1.4	6.5
400 kva							730	5050/5760	1.3	6.5
500 kva							860	7280/6930	1.2	6.5
630 kva							1040	8280	1.1	6.5
800 kva							1230	9900	1.0	6.5
1000 kva							1440	12150	1.0	6.5
1250 kva							1760	14670	0.9	6.5
1600 kva							2120	17550	0.8	6.5
2000 kva							2490	20740	0.8	6.5
2500 kva							2950	24420	0.8	6.5
3150 kva							3510	29050	0.7	6.5
4000 kva							4200	34940	0.7	6.5
5000 kva							4960	41160	0.7	6.5

Ordering instructions

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 - Main parameters of transformer (voltage, capacity, loss and other main parameters)
- Transformer operating environment (altitude, temperature, humidity, location, etc.)
- Other customization requirements (tap switch, color, oil pillow, etc.)
- The minimum order quantity is 1 sets, worldwide delivery within 7 days
- Normal delivery period of 30 days, worldwide fast delivery