10kV–35kV Oil-Immersed Transformers for Mining and Power Plants
10-31 2025 | By:
Introduction
Mongolia’s vast natural resources and rapidly expanding energy infrastructure have created an increasing demand for stable, efficient, and durable power distribution systems. Oil-immersed transformers play a vital role in ensuring the continuous and reliable transmission of electricity across mining areas, industrial zones, and power plants.
ZTelec Yuguang, a leading transformer manufacturer from China, provides customized 10kV–35kV oil-immersed transformers designed to operate efficiently under Mongolia’s harsh environmental conditions — from freezing winters to dusty mining regions.
ztelec China
Why Choose Oil-Immersed Transformers for Mongolia?
Oil-immersed transformers are widely used in Mongolia due to their excellent heat dissipation, strong insulation performance, and long service life. The transformer core and windings are immersed in insulating oil, which effectively cools and protects the unit, ensuring stability even under high load and temperature fluctuations.
Key Advantages:
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Superior Cooling Performance: Transformer oil ensures efficient heat dissipation, preventing overheating in continuous operation.
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High Dielectric Strength: Provides reliable insulation between high-voltage components.
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Long Service Life: Designed for 25+ years of continuous operation in harsh outdoor environments.
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Low Noise & Low Loss: Ideal for mining power stations and industrial networks.
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Adaptability to Cold Climates: Special anti-freeze transformer oil ensures stable performance at −40°C, suitable for Mongolian winters.
Technical Specifications
ZTelec manufactures a complete series of 10kV–35kV oil-immersed transformers. The models comply with IEC 60076 and GB 1094 international standards.
| Model | Rated Capacity (kVA) | High Voltage (kV) | Low Voltage (kV) | Connection Type | Cooling Method | No-Load Loss (W) | Load Loss (W) |
|---|---|---|---|---|---|---|---|
| S11-1000/10 | 1000 | 10 | 0.4 | Dyn11 | ONAN (Oil Natural Air Natural) | 1340 | 10200 |
| S11-1600/10 | 1600 | 10 | 0.4 | Dyn11 | ONAN | 1780 | 14500 |
| S11-2500/10 | 2500 | 10 | 0.4 | Yyn0/Dyn11 | ONAN | 2450 | 20600 |
| S13-2000/20 | 2000 | 20 | 0.4 | Dyn11 | ONAN | 1890 | 15800 |
| S13-3150/35 | 3150 | 35 | 6.3 / 10.5 | YNd11 | ONAN / ONAF | 2650 | 24500 |
ONAN: Oil Natural Air Natural / ONAF: Oil Natural Air Forced
Applications in Mongolian Energy and Mining Industry
ZTelec oil-immersed transformers are widely used key energy sectors:
1. Mining Power Distribution
In gold, copper, and coal mines across regions like Erdenet, Oyu Tolgoi, and Tavan Tolgoi, stable power is essential for continuous operation of crushers, conveyor belts, and processing units.
ZTelec’s S11 and S13 series oil-immersed transformers ensure smooth voltage regulation, low losses, and minimal downtime.
2. Power Generation Plants
Used in thermal, hydro, and renewable power plants, oil-immersed transformers are responsible for stepping up generated voltage for transmission and stepping it down for industrial consumption.
ZTelec transformers are equipped with moisture-proof seals and reinforced insulation suitable for outdoor substations.
3. Industrial and Grid Distribution
These transformers are also ideal for industrial parks, cement plants, and grid substations that require long-term reliable performance with minimal maintenance.
Design Features
ZTelec Yuguang oil-immersed transformers are engineered to meet international standards .
| Feature | Description |
|---|---|
| Core Material | Cold-rolled grain-oriented silicon steel, low magnetic loss |
| Winding Material | High-conductivity copper with multi-layer insulation |
| Insulating Oil | Naphthenic mineral oil or ester-based biodegradable oil |
| Tank Structure | Fully sealed corrugated tank or conservator type |
| Protection System | Pressure relief valve, oil level gauge, temperature sensor |
| Cooling System | ONAN / ONAF for stable operation under heavy load |
| Ambient Temperature Range | −40°C to +45°C |
| Altitude Adaptability | ≤2000 m (suitable for highland areas ) |
Customization for Mongolian Projects
ZTelec offers custom transformer solutions to meet the diverse requirements of clients:
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Voltage Classes: 6kV, 10kV, 20kV, 24kV, 35kV
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Power Ratings: 315 kVA – 10 MVA
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Designs: Sealed, conservator type, or explosion-proof for mining applications
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Applications: Outdoor substations, wind farms, mining camps, industrial parks
Each transformer undergoes routine testing, type testing, and special performance evaluation according to IEC and ISO standards before shipment.
ZTelec — Your Reliable Transformer Manufacturer
With over 20 years of experience, ZTelec Yuguang Electric Technology Co., Ltd. has become one of the most trusted manufacturers of electrical insulation materials and power transformers in China.
Our production base is equipped with fully automated winding machines, vacuum oil filling systems, and advanced test labs ensuring every unit meets global performance and safety standards.
ZTelec has successfully supplied oil-immersed transformers to projects in:
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Mongolia — mining and renewable energy
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Kazakhstan — industrial substations
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Russia & Central Asia — grid reinforcement projects
Why Mongolian Clients Choose ZTelec Transformers
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High reliability and excellent insulation performance
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Suitable for harsh temperature and dusty mining environments
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Fast customization for project-specific voltages and capacities
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Technical support and on-site installation guidance
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Competitive factory prices and long-term warranty
Conclusion
ZTelec oil-immersed transformers are engineered to meet the unique challenges of mining and energy sectors. Designed for voltages from 10kV to 35kV and capacities up to 10 MVA, these transformers deliver consistent, efficient, and safe power transformation even under extreme environmental conditions.
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