The INNOFZ Fluorescent Fiber Optic Temperature Monitoring and Control System is a complete temperature control solution for dry-type transformer windings, combining all-optical fluorescent temperature sensing with integrated cooling fan control, alarm and trip functions, and historical data logging. Unlike conventional metal-based temperature sensors, the fluorescent fiber optic sensing element contains no electrically conductive material at the measurement point, making it inherently safe for direct embedding inside high-voltage windings.
Why Dry-Type Transformer Winding Monitoring Requires Fiber Optic Temperature Sensing
Dry-type transformer windings operate in close proximity to high voltage and strong electromagnetic fields, conditions that conventional electrical temperature sensors struggle to handle safely and accurately. Fluorescent fiber optic sensing addresses both core challenges at the source:
- High-voltage resistance — the all-optical sensing tip contains no metal, allowing it to safely withstand high power-frequency voltage and be embedded directly at the winding hot spot without insulation breakdown risk
- Immunity to electromagnetic interference — because temperature is encoded as an optical signal rather than an electrical one, the reading is completely unaffected by the strong EMI generated around energized windings and switching equipment
These two properties make fluorescent fiber optic sensing the preferred choice not only for standard dry-type power transformers, but also for specialized high-EMI, high-voltage environments such as rail transit traction transformers, rectifier transformers, and other power transformer applications where conventional sensors are unreliable or unsafe.
Fluorescent Fiber Optic Sensor vs. PT100 Sensor
| Comparison Item | Sensor de fibra óptica fluorescente | PT100 Sensor |
|---|---|---|
| Sensing Element Material | Rare-earth fluorescent material, all-optical, no metal | Metallic resistance element |
| Electrical Connection at Measurement Point | None — fully passive optical signal | Electrically conductive, direct wiring to measurement point |
| Electromagnetic Interference Immunity | Fully immune, unaffected by strong EMI | Susceptible to interference in high-EMI environments |
| High-Voltage Withstand Capability | Suitable for high-voltage winding embedding | Limited to lower-voltage applications for safety |
| Safety in High-Voltage Windings | Intrinsically safe, no electrical hazard at sensing point | Potential safety hazard due to conductive material |
| Typical Application Scope | High-voltage windings, rail transit, rectifier and power transformers | General low-voltage industrial temperature measurement |
Principais recursos
- Complete temperature control function — automatic and manual cooling fan start/stop driven directly by real-time winding temperature
- All-optical fluorescent sensing, free of metallic components, immune to electromagnetic interference
- High-voltage resistant sensing tip, suitable for direct embedding in dry-type transformer windings
- Black-box data logging — records temperature data from the last power outage and historical peak temperature
- Digital tube display for clear on-site readout, with per-channel display compensation
- Cabinet door-open alarm, plus dedicated relay contacts for over-temperature alarm, trip, fan remote transmission, and controller fault
Aplicações
- Dry-type power transformer winding temperature monitoring and control
- Rail transit traction transformer temperature monitoring
- Rectifier transformer temperature monitoring
- Other power transformer applications in high-voltage, high-EMI environments
Parâmetros técnicos
| Parâmetro | Especificações |
|---|---|
| Fonte de alimentação | CA/CC 220 V |
| Faixa de medição | -40°C to +260°C (customizable for higher range) |
| Precisão da medição | ±1 °C (personalizável para maior precisão) |
| Resolução | 0,1 °C |
| Número de canais | 1–18 channels (customizable) |
| Tipo de sensor | Fibra óptica de quartzo, detecção por ponto fluorescente |
| Comprimento da fibra | Personalizável, 0–20 m |
| Diâmetro da sonda de fibra | 2,5 mm (personalizável para tamanhos menores) |
| Tensão de resistência da sonda | 100 kV |
| Probe Type | Oil-resistant fiber optic probe |
| Interface de comunicação | RS485/Modbus, 4–20mA analog output |
| Tempo de resposta | < 1 segundo |
Standard and Customizable Functions
The base unit includes three-winding temperature measurement, automatic/manual fan control, per-channel display compensation, black-box logging, digital display, cabinet door alarm, and dedicated relay contacts for over-temperature alarm, trip, fan remote transmission, and controller fault. INNOFZ also offers customizable function modules for advanced project requirements:
- Core (iron core) temperature measurement with dedicated over-temperature alarm contacts
- RS485 communication with time synchronization and Modbus-RTU protocol support
- Cooling fan fault diagnosis with dedicated fan fault alarm contacts
- Four independent 4–20mA analog current output channels
- Full computer room environment temperature measurement and control
- Alarm functions based on winding and core temperature rise rate
- Alternative communication protocols including Profibus, IEC60870-5-103, and Ethernet
Personalização e Assistência Técnica
Every INNOFZ fluorescent fiber optic temperature monitoring and control unit is configured to match project-specific voltage class, channel count, and control function requirements. INNOFZ supports OEM/ODM cooperation and has delivered systems with proven field installation history across dry-type transformer, rail transit, and rectifier transformer projects.
- Custom channel count, measurement range, and accuracy beyond standard specification
- Custom function modules selected from the list above to match project control requirements
- OEM/ODM and private-label manufacturing for transformer panel builders
- Pre-sales engineering consultation on sensor placement and system configuration
- After-sales technical support based on documented field deployment experience
Contact INNOFZ to discuss your project requirements and request a tailored configuration.
Perguntas frequentes
Why choose fluorescent fiber optic sensing over a traditional PT100 sensor for transformer windings?
PT100 sensors contain metal and are restricted to lower-voltage applications for safety reasons, while fluorescent fiber optic sensing is all-optical and immune to electromagnetic interference. See the comparison table above for a full side-by-side breakdown.
Is this unit suitable for rail transit or rectifier transformer applications?
Yes. Its high-voltage resistance and full EMI immunity make it suitable for rail transit traction transformers, rectifier transformers, and other power transformer applications operating in demanding electrical environments.
How does the cooling fan control function work?
The unit monitors real-time winding temperature and automatically starts or stops the cooling fan based on configurable thresholds, with a manual override option also available.
Can the alarm and trip contact configuration be customized?
Yes. In addition to the standard over-temperature alarm and trip contacts, additional functions such as core temperature alarms, fan fault diagnosis, and temperature rise rate alarms can be added — see the Standard and Customizable Functions section above.
