800KVA 35KV Three Phase Oil Immersed Distribution Transformer

Manufactured by GUANGBIAN, this 800KVA 35KV Three Phase Oil Immersed Distribution Transformer is a medium-voltage power conversion device designed to step down high-voltage electricity (35kV) to a low-voltage level (typically 0.4kV or 0.415kV) for use by end-users.

It employs insulating oil as both a cooling medium and a dielectric medium, ensuring stable operation, efficient heat dissipation, and a long service life for the equipment in both outdoor and industrial environments.

To further enhance the product's mechanical strength and short-circuit withstand capability, we have implemented innovative designs regarding the oil duct layout and winding connection configuration of this oil-immersed transformer. Furthermore, for all other components of the product, we exclusively utilize parts supplied by our long-standing, highly reputable, and high-quality vendors. Every effort we make is aimed at ensuring that, upon export to overseas markets, this product can be safely and seamlessly integrated into local power grids, thereby effectively serving the broader public.

Key Advantages

High efficiency performance: Optimized core design reduces no-load and load losses

Strong overload capability: Handles short-term peak demand effectively

Excellent thermal management: Oil circulation ensures stable temperature control

Long service life: Typically designed for 20–30 years of operation

High reliability: Stable performance under fluctuating load conditions

Cost-effective operation: Reduced energy loss lowers long-term running cost

Outdoor durability: Suitable for harsh environments with proper enclosure

Technical Document

Operating Environment

Temperature Conditions:

Long-term Operating Ambient Temperature: -25℃ ~ +45℃.

Maximum Operating Ambient Temperature: Not exceeding +50℃.

Storage and Transportation Temperature:

-40℃ ~ +60℃.

Humidity Conditions:

Relative Humidity: ≤95% at 25℃

Altitude Requirements:

Rated Altitude Adaptation Range: ≤1000 meters

Our Factory

Sheet metal workshop

Foil winding workshop

Winding workshop

Winding oven workshop

Transformer assembly workshop

Transformer commissioning workshop

Maintenance Guidelines

Proper maintenance ensures long-term reliability and safety:

Routine Inspection

● Check oil level and oil temperature regularly

● Inspect for oil leakage or abnormal sound

● Monitor load conditions and voltage stability

Oil Testing

● Dielectric strength test (BDV test)

● Moisture content analysis

● Dissolved gas analysis (DGA) for fault detection

Electrical Maintenance

● Tighten terminal connections periodically

● Measure insulation resistance

● Check winding resistance balance

Cooling System Check

● Ensure radiator fins are clean

● Remove dust and debris from cooling surfaces

Recommended Maintenance Cycle

● Basic inspection: monthly

● Oil testing: every 6–12 months

● Comprehensive overhaul: every 3–5 years (depending on load conditions)

Applications

The 800KVA 35KV Three Phase Oil Immersed Distribution Transformer is suitable for a wide range of medium-to-large power demand scenarios:

● Industrial manufacturing plants

● Mining operations and heavy machinery sites

● Commercial complexes and shopping centers

● Renewable energy systems (solar & wind substations)

● Rural and urban power grid distribution

● Infrastructure projects (railway, highway, construction sites)

● Utility substations and regional distribution stations

FAQ

Q1: What is the main function of an 800KVA 35KV transformer?

It steps down 35kV medium voltage electricity to usable low voltage for industrial and commercial consumption.

Q2: What is the difference between oil immersed and dry type transformers?

Oil immersed transformers use insulating oil for cooling and insulation, offering better heat dissipation and higher overload capacity compared to dry type transformers.

Q3: Can this transformer be used outdoors?

Yes. It is specifically designed for outdoor substations and harsh environmental conditions.

Q4: What factors affect transformer efficiency?

Core material quality, load rate, winding material (copper/aluminum), and maintenance condition all affect efficiency.

Q5: Is customization available?

Yes. Voltage ratio, winding material, tap changer type, and tank design can be customized based on project requirements.