FJINNO vs. FISO: Transformer Winding Temperature Monitoring with Fiber Optics

This article compares FJINNO and FISO fiber optic temperature monitoring systems for power transformer windings. We'll explore the advantages of FJINNO's fluorescence technology, FISO's WLPI/SCBG approach, and the critical reasons why fiber optic sensors are essential for ensuring transformer safety and reliability. Key differences in customization, application focus, and installation methods will be highlighted.

Introduction: Importance of Transformer Monitoring

Power transformers are critical assets in electrical grids. Their reliable operation is essential for maintaining a stable power supply. Overheating is a major cause of transformer failure, leading to costly repairs, downtime, and potential safety hazards. Therefore, continuous monitoring of transformer winding temperature, particularly the "hot spot" temperature, is crucial for predictive maintenance and preventing catastrophic failures.

Methods of Transformer Temperature Monitoring

Several methods are used to monitor transformer temperature, each with its advantages and limitations:

• Thermocouples: Traditional temperature sensors, but susceptible to electromagnetic interference (EMI) and pose electrical safety risks in high-voltage environments.
• Resistance Temperature Detectors (RTDs): Also susceptible to EMI and electrical hazards.
• Thermal Imagers (Infrared Cameras): Can only measure the external surface temperature of the transformer tank, not the internal winding temperature. They provide an indirect indication and are affected by ambient conditions.
• Fiber Optic Temperature Sensors: Immune to EMI, electrically insulating, and can be directly embedded within the windings to measure the hot spot temperature accurately. This is the most advanced and reliable method.

Why Use Fiber Optic Sensors for Transformer Monitoring?

Fiber optic temperature sensors offer significant advantages over traditional methods for transformer winding temperature monitoring:

• EMI Immunity: Fiber optic sensors are completely immune to electromagnetic interference, a major concern in the high-voltage environment of a transformer. Traditional electrical sensors are highly susceptible to EMI, leading to inaccurate readings and potential damage.
• Electrical Isolation: Fiber optic sensors are made of dielectric materials (glass or plastic), providing inherent electrical insulation. This eliminates the risk of short circuits, electrical arcing, or safety hazards associated with electrical sensors.
• Direct Winding Measurement: The small size and flexibility of fiber optic sensors allow them to be directly embedded within the transformer windings during manufacturing or retrofitted. This enables direct measurement of the hottest point (hot spot) within the winding, providing the most accurate and critical temperature data.
• High Accuracy and Stability: Fiber optic sensors offer high accuracy and long-term stability, providing reliable temperature readings over the lifespan of the transformer.
• Remote Sensing: The optical signal can be transmitted over long distances without degradation, allowing for remote monitoring and data acquisition.
• Chemical Inertness: Fiber optic sensors are resistant to the harsh chemical environment within transformer oil.

FJINNO vs. FISO: A Comparison

Both FJINNO and FISO are leading providers of fiber optic temperature monitoring systems for transformers. However, they differ in their technology and approach:

Feature	FJINNO	FISO (Based on available information)
Technology	Fluorescence Decay	White Light Polarization Interferometry (WLPI) / Semiconductor Band Gap (SCBG) - GaAs crystal
Customization	High (OEM/ODM, Private Label)	Likely some configuration options, but primarily standardized products ("Nortech" system)
Product Focus	Broad range of applications, including transformers, with a strong emphasis on customizable solutions	Primarily focused on transformer winding hot spot temperature monitoring with the "Nortech" system
Installation	Standard fiber optic installation procedures; specific details depend on customization	EasyDisk" system for simplified and standardized installation within transformer windings, compliant with IEC 60076-2 (Annex E)
Cost	Generally positioned as more cost-effective, especially for custom solutions	Pricing not detailed, but potentially higher for non-standard requirements

FJINNO utilizes *fluorescence decay* technology. A fluorescent material at the fiber tip emits light, and the decay time of this fluorescence is directly related to temperature. This method is inherently safe, EMI immune, and highly accurate. FJINNO emphasizes customization, offering OEM/ODM and private label options. This allows for tailored solutions and integration into existing monitoring systems.

FISO, on the other hand, employs *White Light Polarization Interferometry (WLPI) / Semiconductor Band Gap (SCBG)* technology, using a Gallium Arsenide (GaAs) crystal. The system measures the shift in the absorption band edge of the GaAs crystal as temperature changes. FISO's "Nortech" system is specifically designed for transformer winding hot spot temperature monitoring, with an "EasyDisk" for simplified installation, ensuring compliance with IEC 60076-2.

FAQ: Fiber Optic Temperature Sensing

Conclusion

Both FJINNO and FISO offer valuable fiber optic temperature monitoring solutions for transformers. FISO has a well-established, transformer-specific product line. FJINNO provides greater flexibility and customization, often at a lower cost, with broader application experience. The best choice depends on the specific needs and priorities of the user. FJINNO's commitment to innovation and customer-focused solutions makes it a strong contender for any transformer monitoring project.