35kV Power Transformer – High Efficiency Medium Voltage Substation Transformer

35kV power transformers are essential medium-voltage electrical equipment widely used in substations, industrial distribution systems, and renewable energy projects. These transformers are designed to provide reliable voltage conversion while ensuring high efficiency, low loss, stable output voltage, and long service life. With optimized magnetic circuit design and advanced insulation systems, modern 35kV transformers can operate safely in demanding environments and support continuous power supply for critical infrastructure.

High Efficiency and Low Loss Design

The core adopts high-permeability silicon steel laminations combined with precision step-lap technology to reduce no-load losses. Optimized copper or aluminum windings minimize load losses, improving overall energy efficiency. This design helps reduce operational costs and supports energy-saving power distribution systems.

Strong Short-Circuit Withstand Capability

Mechanical reinforcement of windings and advanced clamping structures enhance the transformer's ability to withstand short-circuit forces. This improves system safety and ensures reliable performance even during sudden fault conditions.

Excellent Thermal Stability

Optimized oil circulation and cooling structures improve heat dissipation efficiency. The enhanced thermal design allows stable operation under overload conditions and extends transformer service life.

Stable Voltage Regulation

On-load tap changer models are available to maintain stable output voltage during load fluctuations. This feature is especially important for industrial loads and grid-connected renewable energy systems that require precise voltage control.

Long Service Life and Low Noise

High-quality insulation materials and vacuum oil filling technology improve dielectric strength and reliability. Low noise core construction makes the transformer suitable for urban substations and environmentally sensitive areas.

Typical Models

SZ11-12500/35 is a 12.5MVA 35kV power transformer designed for medium-size substations and industrial power distribution systems. It provides stable voltage conversion and high efficiency performance for continuous operation.

SF11-40000/35 is a 40MVA 35kV power transformer suitable for large substations, heavy industry, and renewable energy projects requiring high-capacity power transmission.

Application Areas

These 35kV power transformers are widely used in regional substations, urban distribution networks, industrial parks, mining operations, wind power plants, solar farms, petrochemical facilities, metallurgical industries, and railway traction substations. Their flexible design supports both utility and industrial power systems.

Standards and Certifications

The transformers are designed and manufactured in accordance with IEC 60076, IEEE C57, and GB/T 1094 standards. Quality management complies with ISO 9001, environmental management follows ISO 14001, and occupational safety adheres to ISO 45001 requirements. Optional certifications such as CE marking, SGS test reports, and CNAS laboratory testing are available upon request.

Factory Testing and Quality Assurance

Each transformer undergoes comprehensive routine and type testing before delivery. Tests include winding resistance measurement, transformer turns ratio verification, vector group confirmation, insulation resistance testing, no-load and load loss measurement, impedance and short-circuit testing, induced voltage testing, AC withstand voltage testing, partial discharge measurement, and oil dielectric strength testing. All testing procedures strictly comply with IEC and IEEE standards to ensure safety, reliability, and long-term performance.