110 kV Three-Phase Oil-Immersed Power Transformer

DINGXIN 110 kV three-phase oil-immersed power transformers are designed for reliable voltage conversion in utility grids, power plants, industrial facilities and major infrastructure projects.

Available from 6.3 MVA to 63 MVA, these transformers combine low losses, strong short-circuit withstand capability and effective oil cooling. The electrical design, tank structure, winding material, tap range, cooling system and accessories can be customized to match the customer’s network and operating conditions.

Advanced electromagnetic, electric-field and mechanical calculation tools are used to optimize the core, windings, leads, insulation and tank before manufacturing.

Reliable Long-Term Operation

High-quality insulation materials, controlled manufacturing and comprehensive factory testing support stable operation throughout the transformer’s service life.

Strong Short-Circuit Withstand Capability

The windings are mechanically compressed and securely supported to withstand electromagnetic forces under specified short-circuit conditions.

Low Loss and Low Noise

The core is precisely cut, assembled and hydraulically compressed to reduce no-load losses, vibration and operating noise.

Effective Cooling

Transformer oil and radiators dissipate heat efficiently. ONAN, ONAF and other cooling configurations are available according to the required capacity and loading conditions.

Leak-Resistant Tank

Machined sealing surfaces, oil-resistant gaskets and controlled welding help reduce the risk of oil leakage during transportation and operation.

Flexible Project Configuration

Customers can specify the voltage ratio, capacity, impedance, vector group, tap range, cooling method, winding material, tank type, accessories and applicable standards.

• Three-dimensional design software supports accurate engineering drawings and interface verification.
• Electromagnetic calculations optimize the transformer core and windings.
• Electric-field analysis supports insulation coordination and stress control.
• Short-circuit calculations verify winding mechanical strength under specified fault conditions.
• Hydraulic core pressing improves structural stability and helps reduce vibration and noise.
• Winding compression and bracing improve resistance to short-circuit forces.
• Controlled tank welding and oil-resistant gaskets help prevent leakage.
• Materials and accessories are selected from qualified suppliers.
• Inspection records are maintained throughout production.

A customized 110 kV transformer may include:

• High- and low-voltage bushings;
• On-load or de-energized tap changer;
• Conservator;
• Radiators and cooling fans;
• Buchholz relay;
• Pressure-relief device;
• Oil-level indicator;
• Oil and winding temperature indicators;
• Current transformers;
• Moisture-control breather;
• Control cabinet;
• Online monitoring system;
• Neutral grounding equipment;
• Customer-specified protection and communication interfaces.

DINGXIN 110 kV power transformers are suitable for:

• Utility transmission and distribution substations;
• Power plants;
• Hydropower and renewable-energy projects;
• Industrial parks and large factories;
• Mining and metallurgical facilities;
• Oil and gas projects;
• Railway and traction substations;
• Water treatment facilities;
• Commercial and infrastructure developments;
• EPC and overseas power projects.

For an accurate transformer design and quotation, please provide:

1. Rated capacity;
2. Primary and secondary voltage;
3. Frequency;
4. Vector group;
5. System grounding method;
6. Required impedance;
7. Tap range and regulation method;
8. Insulation level and BIL;
9. Ambient temperature and altitude;
10. Cooling method;
11. Maximum transport dimensions and weight;
12. Required accessories;
13. Applicable standards;
14. Quantity, destination and delivery schedule.