We are a reliable distribution transformer manufacturer supplying high-quality oil immersed distribution transformer and power grid transformer.
Our electrical power transformers with off-circuit tap changer are widely used for power distribution projects, featuring low loss, stable performance and competitive factory price.
This oil immersed distribution transformer is painted in light industrial grey, adopting rectangular welded steel tank with corrugated radiators for heat dissipation.
It conservator, high voltage porcelain bushings and control cabinet are mounted on the tank top. The overall dimensions can be customized according to rated capacity.
The core is made of high-grade grain-oriented silicon steel sheet, copper windings with strong insulation.
As a durable power distribution transformer, it steps down medium voltage to low voltage for power delivery.
As an experienced distribution transformer manufacturer, we offer competitive bulk pricing.
Our power grid transformer and electrical power transformers have been exported to many countries for grid upgrading and industrial distribution projects.
Product Features
• Off-circuit Tap Voltage Regulation
This power distribution transformer uses no-load tap changer. Voltage adjustment must be carried out after power cut. Simple mechanical structure, low failure rate and minimal maintenance cost, suitable for power grid transformer projects with infrequent grid voltage fluctuation.
• Ultra-low Loss & Energy Saving
High-grade grain-oriented silicon steel core greatly reduces no-load loss. Optimized winding structure cuts operating power consumption, helping customers save long-term electricity expense for distribution networks.
• Reliable Oil Immersed Cooling System
The oil immersed distribution transformer adopts ONAN cooling mode. Transformer oil circulates inside the tank and dissipates heat through external radiators, ensuring continuous stable operation under rated load.
• Heavy-duty Anti-corrosion Structure
Thick welded steel tank with weather-resistant grey coating, dust-proof and moisture-proof, suitable for outdoor substation and grid environments. This series of electrical power transformers can withstand long-time continuous operation.
• Customization & Cost Advantage
As a professional distribution transformer manufacturer, we support custom capacity, voltage ratio and accessories. Direct factory sales remove intermediate costs, so we can provide cost-effective solutions for your power distribution projects.
Specifications & Parameters
| Category | Specification / Description |
| Product Type | Oil Immersed Distribution Transformer, Off-circuit Tap Changer |
| Rated Voltage | 10kV / 0.4kV (customizable) |
| Phase | 3 Phase |
| Frequency | 50Hz / 60Hz |
| Cooling Method | ONAN (Oil Natural Air Natural) |
| Tap Range | ±2×2.5% |
| Core Material Options | Grain-oriented Silicon Steel |
| Winding Material | Copper |
| Tank Color | Light Grey Industrial Paint |
| Application | Power grid, industrial park, residential area power distribution |
Key Performance Data (10kV Series Example)
The table below illustrates the tiered loss values for the 10kV series with different core materials. Please contact us for the complete and detailed datasheet.
| Capacity (kVA) | Efficiency Level 1 | Efficiency Level 2 |
Efficiency Level 3 |
|||
| Silicon Steel No-Load (W) | Amorphous No-Load (W) | Silicon Steel No-Load (W) | Amorphous No-Load (W) | Silicon Steel No-Load (W) | Amorphous No-Load (W) | |
| 100 | 120 | 60 | 135 | 75 | 150 | 75 |
| 315 | 270 |
135 | 305 | 170 | 340 | 170 |
| 1000 | 665 | 360 | 745 | 450 | 830 | 450 |
| Note: Load loss values vary by vector group and material. Refer to the full parameter table for details. | ||||||
Packaging, Warranty & Certifications Packaging：
Our power distribution transformer will be fixed on heavy steel skid for transportation. Main tank is reinforced by outer steel frame to avoid deformation in sea and land transit. Bushings, spare parts and accessories are packed in solid plywood crates. Desiccant is placed inside the tank to keep insulation dry.
Warranty：
18 months warranty from shipment or 12 months after commissioning, whichever comes first. Warranty covers manufacturing defects of our electrical power transformers. Our technical team provides remote guidance for installation, commissioning and troubleshooting.
Certifications & Testing：
As a professional distribution transformer manufacturer, all oil immersed distribution transformer strictly follow ISO9001 quality system. Each unit completes full routine and type tests including winding resistance, transformation ratio, no-load & load loss, dielectric test. IEC, GB1094, CE, GOST, EAC certifications can be provided on request.
Use Scenarios
Urban & Rural Power Grid Upgrading
As a key power grid transformer, this oil immersed distribution transformer is widely installed in urban and rural distribution networks. As a stable power distribution transformer, it converts medium voltage grid power to low voltage for residential and public facilities. As a professional distribution transformer manufacturer, we supply reliable electrical power transformers for grid renovation projects around the world.
Industrial Park Power Supply
The oil immersed distribution transformer provides continuous and safe power for factories, workshops and industrial zones. The off-circuit tap changer design is ideal for sites where grid voltage rarely changes. It maintains stable power supply for production equipment and reduces risk of power failure.
Commercial & Public Infrastructure
It is applied in shopping malls, hospitals, schools and other public projects. This series of electrical power transformers offers steady voltage output, guarantees power safety for large public loads, and is easy to maintain.
Renewable Energy Auxiliary Distribution
Suitable for small solar or wind power station distribution side. The power grid transformer can handle fluctuating power output from renewable sources, realizing safe power transmission to local distribution network.
FAQ
1. What is an off-circuit tap changer on this power distribution transformer?
Off-circuit tap changer means voltage adjustment can only be done after cutting off power. It has simple construction, low failure rate and lower price compared with OLTC transformers, a cost-effective option for stable grid conditions.
2. Can the distribution transformer manufacturer customize voltage and capacity for our oil immersed distribution transformer?
Yes. We can customize rated capacity, voltage combination, dimensions and accessories according to your local grid standards. Our electrical power transformers can meet IEC or GB requirements.
3. What cooling system does this power grid transformer adopt?
It uses ONAN oil natural air natural cooling system. Transformer oil circulates inside the tank and dissipates heat through external radiators, which is mature and low maintenance for most distribution scenarios.
4. What test documents will you provide before shipment?
We supply factory test reports, general arrangement drawings, operation manual and related certificates. All tests cover winding resistance, ratio test, no-load & load loss, dielectric withstand test. CE, GOST, EAC are available upon request.
5. What after-sales service do you provide?
We offer remote technical guidance for installation, commissioning and troubleshooting. Warranty period is 18 months after shipment or 12 months after commissioning (whichever comes first), covering manufacturing defects.
