Transformer winding fiber optic temperature measurement system

FJINNO provides the only industrially-proven fiber optic temperature sensor system for direct, real-time transformer hot spot monitoring, safeguarding your most valuable assets from catastrophic failure.

Fiber optic temperature measurement device Transformer fiber optic temperature sensor
Technician inspecting a large power transformer

Transformer winding temperature monitoring fiber optic sensor

The operational life of a transformer is dictated by the health of its cellulose insulation. Excessive heat—even for short periods—causes rapid, irreversible degradation, dramatically increasing the risk of failure.

  • Problem: Traditional methods using an oil temperature thermometer and calculated WTI (winding temperature indicator) do not measure the true winding hot-spot. They are slow, inaccurate, and miss critical dynamic events.
  • Solution: Our transformer winding temperature sensor is placed directly in the windings, providing the precise data needed for effective condition monitoring of transformer assets and to truly enable the "doble life of a transformer 2025" initiative.

Why Direct Fiber Optic Monitoring is The New Standard

Our fluorescence sensor technology is purpose-built to overcome the limitations of all other monitoring methods for power transformer monitoring.

Immune to High Voltage & EMI

Our sensors are made of quartz glass and are completely non-conductive. They deliver flawless data, unaffected by the extreme electromagnetic fields inside a hot transformer or substation.

Safe for Oil-Immersed Windings

With no electricity at the point of measurement, our winding sensor is intrinsically safe. It is completely resistant to hot transformer oil, varnish, and kerosene, making it safe for any tank in transformer.

Extend Asset Life & Optimize Loading

By knowing the true winding temperature, you can safely increase loading during peak demand and avoid the accelerated aging caused by overheating, maximizing your return on investment.

Fiber optic thermometer vs. transformer thermometer

A standard resistance temperature device (RTD) in a thermowell only measures top oil temperature. See how our direct transformer winding temperature monitoring provides superior data and protection.

Capability FJINNO Fluorescent Fiber Optic Traditional WTI/OTI
Measures True Winding Hot-Spot ✓ ✗
Real-Time Response to Load Changes ✓ ✗ (Slow thermal lag)
Accuracy During Transients Very High Very Low
Enables Dynamic Loading Models ✓ ✗
Detects Cooling System Issues ✓ ✗ (Delayed indication)
Basis for True Smart Monitoring Transformers The Best Limited

Monitoring for All Transformer Types

Our flexible fiber optic sensor systems are field-proven in a wide range of transformer designs and applications, from generation to industrial use.

Large Power Transformers (LPT/GSU)

For mission-critical assets, direct monitoring is non-negotiable. Protect generator step-up units and key transmission transformers from thermal runaway.

Dry-Type & Cast Resin

Air-cooled transformers are highly susceptible to hotspots from blocked ventilation or overloads. Our sensors provide essential protection where oil monitoring is not applicable.

Distribution & Network Transformers

As grids become more complex with distributed generation, direct thermal data is vital for managing network transformers and ensuring local grid stability.

Special & Industrial Transformers

From rectifiers and furnaces to marine and traction transformers, we provide a rugged monitoring solution for any design facing harsh duty cycles and unique thermal stresses.

The FJINNO Transformer Monitoring System

We provide a complete, end-to-end transformer monitoring system. Every component is manufactured in our own factory and engineered to work together flawlessly.

Fluorescent Fiber Optic Sensor

Our rugged fiber optic probe, specifically designed and tested for long-term survival directly on transformer windings, spacers, or leads.

Fiber optic temperature transmitter demodulator

A multi-channel transformer monitor that converts the optical signal to data, providing alarms and communication via Modbus, RS485, or IEC 61850.

Fiber optic temperature measurement system Software

Powerful, user-friendly software for viewing real-time data, analyzing historical trends, and managing the thermal health of your entire transformer fleet.

The OEM Partner of Choice for Transformer Manufacturers

Integrate the industry's best transformer temperature monitoring technology directly into your products. As a dedicated manufacturer and supplier, we offer comprehensive OEM / ODM and private label programs to help you deliver true transformers with digital monitoring.

Partner with us to add significant value, enhance safety, and create a powerful competitive advantage for your transformer offerings. We support you with everything from engineering and integration to wholesale pricing.

Become a Partner
EFiber optic temperature measurement system supplier

Protect Your Most Critical Assets. Upgrade to Direct Monitoring.

Contact the FJINNO team today. Our experts are ready to discuss your specific transformer design, provide detailed technical specifications, and prepare a comprehensive quote for your project.

Request Your Quote Now