The temperature monitoring system for 110kV SF22 Series Oil-immersed Transformers is an important component in ensuring the stable operation of substation equipment. With the continuous development of power equipment, temperature monitoring systems are becoming increasingly widely used in Oil immersed transformer.

Introduce how the temperature monitoring system for Oil immersed transformer works from the aspects of the system's working principle, functional characteristics, and practical applications.

The core task of the temperature monitoring system for110KV oil immersed transformer is to monitor the temperature changes inside the transformer in real time, detect temperature anomalies in a timely manner, and prevent equipment damage or accidents caused by overheating.

The temperature monitoring system usually obtains temperature data of various parts inside the transformer through sensors. These sensors can sense key temperature parameters such as oil temperature and winding temperature, and transmit them to the main control equipment of the monitoring system.

110kV SF22 Series oil-immersed transformers: Technical Overview and Applications

Introduction

110kV SF22 series oil-immersed transformers are critical components in high-voltage power transmission and distribution systems. These transformers are designed to efficiently step up or step down voltages while ensuring reliable performance under varying load conditions. The SF22 series represents an advanced iteration of oil-immersed transformers, incorporating robust insulation systems, optimized cooling mechanisms, and enhanced safety features. This article provides a detailed exploration of their design, operational principles, key features, and typical applications.

Design and Construction

The 110kV SF22 series oil-immersed transformers are built with a focus on durability, efficiency, and safety. Key structural components include:

1. Core

Constructed from high-grade grain-oriented silicon steel to minimize hysteresis and eddy current losses.

Laminated core design reduces no-load losses and ensures low noise levels.

2. Windings

Primary and secondary windings are made of copper or aluminum conductors, insulated with high-temperature-resistant materials.

Disc-type or layer-type winding configurations are employed to withstand short-circuit forces.

3. Tank and Cooling System

The tank is fabricated from welded steel, designed to withstand internal pressure and environmental stresses.

Cooling methods include ONAN (Oil Natural Air Natural) or ONAF (Oil Natural Air Forced), depending on the transformer’s capacity and application.

4. Insulation and Oil

Mineral oil serves as both an insulating and cooling medium. The oil is periodically filtered to maintain dielectric strength.

Solid insulation materials, such as pressboard and cellulose, are used to prevent electrical discharges.

Key Features

1. High Efficiency

The SF22 series complies with international efficiency standards (e.g., IEC 60076), featuring low no-load and load losses.

2. Reliability and Longevity

Robust construction and high-quality materials ensure a service life exceeding 30 years with proper maintenance.

3. Safety Mechanisms

Equipped with pressure relief devices, Buchholz relays (for gas detection), and temperature monitoring systems to prevent failures.

4. Environmental Adaptability

Suitable for outdoor installation in diverse climates, with corrosion-resistant coatings and sealed designs to prevent moisture ingress.

5. Low Noise Levels

Advanced core design and vibration-damping materials keep noise levels below 65 dB, making them suitable for urban installations.

Operational Principles

110kV SF22 transformers operate on electromagnetic induction principles:

Step-Up Function: Increases voltage for long-distance transmission, reducing line losses.

Step-Down Function: Decreases voltage for safe distribution to end-users.

The oil-immersed design ensures efficient heat dissipation, while the insulation system prevents breakdowns under high-voltage stress.

Applications

1. Power Transmission Networks

Used in substations to interconnect 110kV grids, facilitating bulk power transfer.

2. Industrial Facilities

Supports heavy machinery and manufacturing plants requiring stable high-voltage supply.

3. Renewable Energy Integration

Connects wind or solar farms to the grid by stepping up generated voltage.

4. Urban Power Distribution

Steps down voltage for commercial and residential areas, ensuring safe electricity delivery.

Maintenance and Monitoring

Regular maintenance is essential for optimal performance:

Oil Testing: Checks dielectric strength, moisture content, and dissolved gas analysis (DGA) to detect internal faults.

Winding Resistance Tests: Identifies loose connections or degradation.

Thermal Imaging: Monitors hotspots in bushings or connections.

Conclusion

The 110kV SF22 series oil-immersed transformers are engineered for high efficiency, reliability, and adaptability in demanding electrical systems. Their advanced design and safety features make them indispensable in modern power infrastructure. By adhering to stringent maintenance protocols, these transformers can deliver decades of uninterrupted service, supporting global energy needs sustainably.