Zisheng’s 10 kV Class Three Phase Distribution Oil Immersed Transformer is a flagship product of Baoding Zisheng Electrical an ISO-certified manufacturer rooted in China’s power transmission and transformation cluster. Featuring a low-loss wound core and advanced oil-immersed insulation, it meets IEC, IEEE, and ANSI standards, with hermetically sealed and conservator options. Ideal for urban grids, industrial parks, and mining projects, it delivers stable overload capacity, long service life, and customizable solutions, backed by professional overseas after-sales support.

Low Loss Performance & Energy Saving

As a core advantage of the 10 kV Class Three Phase Distribution Oil Immersed Transformer, its low-loss design relies on a high-grade cold-rolled silicon steel wound core. The seamless integral core structure eliminates magnetic circuit gaps, reducing no-load loss by 30-40% and no-load current by over 60% compared to traditional laminated core models. This translates to significant energy savings for long-term continuous operation, aligning with global green energy trends and reducing end-user electricity costs.

Advanced Sealing Technology

The transformer adopts a dual-sealing system: high-performance fluororubber gaskets at all joints and laser-welded tank seams, achieving 100% leak-free operation. Hermetically sealed models isolate transformer oil from air, preventing moisture ingress and oil aging, while conservator-type units use a breathing valve to balance internal and external pressure. Both designs ensure oil stability, extending the product’s service life to over 20 years with minimal maintenance.

Heat Dissipation Efficiency

Equipped with corrugated plate radiators, the transformer uses an oil-immersed self-cooled (ONAN) system. The radiators expand and contract with oil temperature changes, replacing traditional oil conservators to save space. The optimized fin layout increases heat dissipation area by 25%, enabling stable full-load operation in -30℃ to +40℃ ambient temperatures. Low operating noise (≤55dB) makes it suitable for both indoor and outdoor installations.

Winding & Insulation Quality

High and low voltage coils are precision-wound with oxygen-free copper wire on core column paper tubes, ensuring tight concentricity and uniform winding. Multi-layer high-density insulation paper and vacuum pressure impregnation (VPI) enhance insulation strength, enabling the transformer to withstand 10 kV rated voltage without breakdown. The winding structure also improves short-circuit resistance, reducing failure risks in complex power grid conditions.

Harsh Environment Adaptability

The tank body undergoes derusting, phosphating, and electrostatic anti-corrosion spraying, with a paint layer thickness of ≥80μm, resisting salt spray, dust, and chemical gas erosion. It performs reliably in coastal areas (salt spray resistance ≥1000 hours), mining sites (dust-proof grade IP44 optional), and high-humidity regions (relative humidity ≤95%). The robust structure also withstands minor vibrations, adapting to industrial and construction site conditions.

Case 1: PT Indo Prima Teknik (Indonesia)

Customer Profile: A leading manufacturer of automotive parts in Jakarta, with a 50,000㎡ production base and 8 production lines requiring stable 10 kV power supply.

Application Scenario: Factory power distribution system upgrade to support new high-power stamping and welding equipment.

Solution: 12 units of 1000 kVA conservator-type transformers with enhanced moisture-proof treatment.

Results: Operated stably for 24 months, no-load loss reduced by 35% compared to old equipment, annual electricity cost savings of ~$18,000; met Indonesia’s PLN power grid standards with zero downtime.

Case 2: Saudi Electricity Company (SEC)

Customer Profile: Saudi Arabia’s national power utility, responsible for Riyadh’s urban power grid expansion to serve 200,000 new residents.

Application Scenario: 10 kV residential distribution substation construction in high-temperature desert areas.

Solution: 18 units of 1600 kVA hermetically sealed transformers with optimized heat dissipation and salt spray-resistant coating.

Results: Passed SABER certification, operated at 45℃ ambient temperature with stable performance; delivery completed in 28 days, supporting on-schedule grid commissioning.

Case 3: African Mining Services (Kenya)

Customer Profile: A gold mining enterprise with operations in Nairobi’s outskirts, requiring reliable power for mining machinery and on-site living quarters.

Application Scenario: Outdoor power supply station in a dusty, vibrating mining environment.

Solution: 8 units of 800 kVA transformers with reinforced tank structure, dust-proof radiators, and overload capacity upgraded to 130%.

Results: Stable operation under intermittent peak loads (120% rated power for 4 hours/day), dust-proof design reduced maintenance frequency by 50%; compatible with local diesel generator sets.

Case 4: European Business Park (Belgium)

Customer Profile: A mixed-use business park in Antwerp, housing 30+ SMEs (logistics, electronics, office spaces) with strict noise and energy efficiency requirements.

Application Scenario: Central power distribution for the park’s 10 kV grid, with indoor installation in a shared electrical room.

Solution: 6 units of 500 kVA low-noise transformers (≤45dB) with CE and RoHS certification.

Results: Met EU environmental standards, noise levels below park regulations; low-loss design contributed to the park’s “Green Building” certification, reducing collective electricity costs by 12%.

Technical Specifications of 10 kV Class Three Phase Distribution Oil Immersed Transformer

Item	Specification
Product Type	Three Phase Oil Immersed Distribution Transformer
Model	S11 / S13 / S20 / S22 Series (Customizable)
Rated Capacity	30 kVA – 2500 kVA (Customized Available)
Rated Voltage	High Voltage: 10 kV / Low Voltage: 0.4 kV (Customizable)
Phase	Three Phase
Frequency	50 Hz / 60 Hz
Voltage Regulation	Off-circuit Tap Changing / On-load Tap Changing Optional
Tapping Range	±2×2.5% or ±5%
Vector Group	Dyn11 / Yyn0 (Optional)
Cooling Method	ONAN (Oil Natural Air Natural)
Insulation Class	Class A
Winding Material	Copper or Aluminum
Core Material	High-quality Cold Rolled Silicon Steel
Tank Type	Corrugated Tank / Radiator Tank
Protection Degree	IP23 (Customizable for Outdoor Applications)
Installation Type	Outdoor / Indoor Installation
Altitude	≤1000 m (Higher Altitude Design Available)
Ambient Temperature	-25℃ to +40℃ (Customized for Special Conditions)
Applicable Standard	IEC 60076 / GB Standards / Customer Requirements

FAQ

Q1: What is a 10 kV Class Three Phase Distribution Oil Immersed Transformer?

A:
It is a medium-voltage distribution transformer designed to reduce 10 kV electrical power to a lower voltage level, usually 0.4 kV, for industrial, commercial, and utility power distribution applications. The transformer uses insulating oil for insulation and heat dissipation to ensure stable operation.

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Q2: What capacities are available for this transformer?

A:
ZISHENG can manufacture 10 kV three-phase oil immersed transformers from small distribution capacities to large industrial applications, commonly ranging from 30 kVA to 2500 kVA. Customized capacities are available according to project requirements.

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Q3: What standards does ZISHENG transformer comply with?

A:
ZISHENG transformers are manufactured according to international and national standards, including IEC 60076 and related electrical equipment standards. Customized designs can meet different country and project requirements.

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Q4: Can the transformer be customized for different countries?

A:
Yes. ZISHENG provides customized solutions according to different grid conditions, climate environments, installation requirements, and local standards, including voltage ratio, frequency, winding materials, protection configuration, and accessories.

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Q5: What are the advantages of an oil immersed transformer?

A:
Oil immersed transformers provide excellent cooling performance, strong overload capability, reliable insulation, long service life, and stable operation under demanding conditions. They are widely used in power grids, industrial plants, renewable energy projects, and infrastructure applications.

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Q6: How does ZISHENG ensure product quality?

A:
Each transformer undergoes strict quality inspections before shipment, including winding resistance tests, insulation tests, no-load loss tests, load loss tests, voltage withstand tests, and overall performance checks to ensure reliable operation.

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Q7: What is the delivery time for customized transformers?

A:
The delivery time depends on transformer capacity, specifications, customization requirements, and order quantity. ZISHENG provides production schedules according to project requirements and maintains strict quality control throughout manufacturing.

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Q8: What information should customers provide when requesting a quotation?

A:
Customers are recommended to provide:

• Rated capacity (kVA/MVA)
• Primary and secondary voltage
• Frequency (50Hz or 60Hz)
• Phase number
• Installation location
• Required standards
• Special environmental conditions
• Required accessories and protection devices

Based on these details, ZISHENG can provide a suitable transformer solution and quotation.