Quality standards of product

 

  
1.Quality management system GB/T 19001-2016 ISO 9001: 2015

The operation of the whole ZHENGRUI system is strictly controlled and managed. This ensures the quality of products and material in all stages, from receiving customer requests to design, materials, production, installation, testing, packaging, delivery, after-sales, all of which operate under strict and logically linked processes.

2.Accreditation certificate CE

LOW VOLTAGE DIRECTIVE,ELECTROMAGNETIC COMPATIBILITY DIRECTIVE ATTESTATION OF CONFORMITY
GENERAL PRODUCT SAFETY REGULATION ATTESTATION OF CONFORMITY

confirms that ZHENGRUI technical quality meets the requirements of all specific international standards for testing and calibration laboratories. All ZHENGRUI products are fully tested in a qualified testing room before leaving the factory, ensuring stable quality and providing absolute peace of mind for customers.

Products Description

 

1. Functions of Insulating Oil

The insulating oil in oil-immersed transformers plays a crucial role in performance and safety.

1.1 Electrical Insulation

The oil prevents electrical breakdown by insulating the windings, reducing the risk of short circuits.

1.2 Cooling and Heat Dissipation

Transformers generate heat due to electrical losses. The oil absorbs this heat and transfers it to radiators or external cooling systems, maintaining optimal operating temperatures.

2. Types of Insulating Oil

Different types of oils are used depending on performance requirements and environmental considerations.

2.1 Mineral Oil

Commonly used for its excellent insulating and thermal conductivity properties, though flammable and less environmentally friendly.

2.2 Alternative Oils

  • Silicone-Based Oils: Fire-resistant and thermally stable.
  • Synthetic Hydrocarbon Oils: Enhanced oxidation resistance.
  • Biodegradable Ester Oils: Eco-friendly and used in sensitive environments.

3. Transformer Construction

Oil-immersed transformers are designed for durability and efficiency.

3.1 Core and Windings

  • Core: Made of laminated silicon steel to reduce energy losses.
  • Windings: Copper or aluminum conductors submerged in insulating oil.

3.2 Sealed Tank and Cooling Systems

  • Sealed Tank: Houses core and windings, filled with oil.
  • Cooling Mechanisms: May include radiators, cooling fans, or oil pumps for heat dissipation.

4. Safety Features

To ensure safe operation, oil-immersed transformers incorporate several protective mechanisms.

4.1 Pressure Relief Devices

Prevent excessive pressure buildup to avoid explosions.

4.2 Oil Level Indicators

Monitor oil levels to detect leaks or degradation.

4.3 Buchholz Relay

Detects gas bubbles in the oil, indicating possible internal faults.

4.4 Temperature Sensors

Measure winding and oil temperatures to prevent overheating.

5. Efficiency and Performance

5.1 Reduced Energy Losses

Oil immersion minimizes resistance and core losses, improving efficiency.

5.2 Compact Design

Compared to dry-type transformers, oil-immersed models support higher power densities in a smaller footprint.

5.3 Longevity and Reliability

With proper maintenance, these transformers can operate for decades.

6. Maintenance Requirements

Regular inspections and oil testing are essential for optimal performance.

6.1 Oil Testing

  • Dielectric Strength Test: Ensures proper insulation.
  • Moisture Content Test: Checks for water contamination.
  • Dissolved Gas Analysis (DGA): Identifies internal faults.

6.2 Component Inspections

  • Checking the tank, seals, and bushings for leaks.
  • Ensuring cooling systems are functioning properly.

6.3 Oil Replacement

Old or degraded oil may need to be replaced to maintain insulation and cooling efficiency.

7. Environmental Considerations

Since these transformers use liquid insulation, environmental precautions are necessary.

7.1 Leak Prevention

Sealed tanks and secondary containment systems help prevent oil spills.

7.2 Fire Risk Management

Using fire-resistant oils and explosion-proof designs minimizes hazards.

7.3 Eco-Friendly Alternatives

Biodegradable ester oils reduce environmental impact.

8. Applications of Oil-Immersed Transformers

Due to their efficiency and reliability, oil-immersed transformers are used in various industries.

8.1 Power Grid and Utility Applications

They regulate voltage levels for efficient electricity transmission and distribution.

8.2 Industrial Use

Factories, refineries, and mining operations require stable power for heavy machinery.

8.3 Renewable Energy Systems

Wind and solar farms use transformers to integrate generated power into the grid.

8.4 Commercial and Infrastructure Projects

Buildings, hospitals, and shopping centers rely on oil-immersed transformers for stable electricity supply.

Conclusion

Oil-immersed transformers are essential in modern power systems, offering superior cooling, insulation, and efficiency. With proper maintenance and safety measures, they provide long-lasting and reliable operation. As industries shift towards eco-friendly solutions, the use of biodegradable insulating oils is increasing, ensuring sustainability while maintaining performance.