What Is a Polyimide Protected Fiber Optic Temperature Sensor?
A polyimide protected fiber optic temperature sensor is an optical temperature probe designed for transformer winding hotspot measurement. The fluorescent sensing tip is connected with quartz optical fiber and protected by a polyimide insulation structure, making it suitable for installation inside oil-immersed transformers.
Compared with general fiber optic temperature probes, the polyimide protected structure is thinner, more flexible and more suitable for winding installation. It can be routed near transformer windings, spacers, internal support structures or other hotspot positions during transformer manufacturing or maintenance.
Why Use Polyimide Protection in Transformer Windings?
Oil-immersed transformer interiors require materials that can work under heat, transformer oil, high voltage and long-term insulation stress. Polyimide is used as a protective and insulating material because it supports flexible installation, compact routing and stable operation in winding-related temperature measurement positions.
Main Application Positioning
This product is suitable for oil-immersed transformer winding temperature measurement, winding hotspot monitoring, internal transformer optical temperature sensing and embedded high-voltage temperature monitoring applications.
Principio de medición óptica fluorescente basado en el tiempo de vida
The sensing tip contains temperature-sensitive fluorescent material. When the monitoring device sends excitation light through the optical fiber, the fluorescent material emits an afterglow signal. The decay lifetime of this afterglow changes with temperature, and the monitoring device calculates the temperature from the lifetime value.
Excitación óptica
Excitation light is transmitted through the quartz optical fiber to the fluorescent sensing tip installed inside the transformer.
Afterglow Signal Return
The fluorescent material emits a returned optical signal after excitation, and the optical signal is transmitted back through the fiber.
Detección de por vida
The monitoring device detects the fluorescence decay time instead of relying only on returned light intensity.
Temperature Calculation
The decay lifetime is converted into a temperature value through calibration data, providing point-type hotspot temperature measurement.
Why Lifetime Measurement Is Used
Lifetime-based measurement is less affected by optical power fluctuation, connector loss, fiber bending and light source aging. This makes it suitable for embedded transformer monitoring where long-term signal stability is important.
Ventajas clave para aplicaciones de transformadores sumergidos en aceite
Polyimide Insulated Protection
The polyimide protection layer provides electrical insulation and flexible mechanical protection for winding-related installation positions.
Oil-Immersed Environment Compatibility
The sensor structure is suitable for transformer oil environments where long-term material stability and insulation compatibility are important.
Flexible Winding Installation
The protected optical fiber can be routed along winding structures, spacers or internal support positions without using electrical signal wiring at the measuring point.
Direct Hotspot Measurement
The sensing tip can be placed near the expected hotspot position, helping measure winding temperature more directly than external oil temperature measurement.
High-Voltage Optical Isolation
The sensing point is optical and electrically insulating, which helps reduce electrical interference and insulation risk inside high-voltage transformer structures.
Long-Term Embedded Monitoring
The sensor is designed for applications where the probe is installed inside the transformer and expected to operate continuously for long service periods.
Especificaciones técnicas
| Elemento de las especificaciones | Configuración estándar / opcional |
|---|---|
| Nombre del producto | Polyimide Protected Fiber Optic Temperature Sensor |
| Solicitud | Oil-immersed transformer winding hotspot measurement |
| Principio de medición | Medición de la temperatura mediante el tiempo de vida del resplandor fluorescente |
| Tipo de sensor | Detección óptica de temperatura de tipo puntual |
| Rango de temperatura | de -40 °C a +260 °C |
| Precisión | de ±0,5 °C a ±1 °C |
| Resolución | 0,1 °C |
| Tiempo de respuesta | Menos de 1 segundo |
| Diámetro de la sonda | De 2 mm a 3 mm, personalizable |
| Longitud de la fibra | De 0 m a 80 m, personalizable |
| Tipo de fibra | Fibra óptica de cuarzo |
| Protection material | Polyimide protected insulation structure |
| Tipo de instalación | Winding-installed, embedded, routed along spacer or customized |
| Aislamiento eléctrico | Punto de detección óptica eléctricamente aislante |
| Capacidad de resistencia a alta tensión | Por encima de los 100 kV, dependiendo de la estructura de aislamiento y las condiciones de instalación |
| Entorno petrolero | Adecuado para aplicaciones en transformadores sumergidos en aceite |
| Inmunidad a las interferencias electromagnéticas | Apto para entornos con fuertes campos electromagnéticos |
| Vida útil | Más de 25 años en condiciones de funcionamiento adecuadas |
| Dispositivo compatible | Dispositivo de monitoreo de temperatura por fibra óptica de un solo canal o multicanal |
| Personalización | Probe diameter, fiber length, sensing tip, protection structure and mounting method |
Estructura del producto
Punta de detección fluorescente
The sensing tip is placed at the target hotspot position and is used for direct point-type temperature measurement.
Fibra óptica de cuarzo
The quartz optical fiber transmits excitation light and returned fluorescence signals between the sensing tip and the monitoring device.
Polyimide Protection Layer
The polyimide protection structure provides insulation, flexibility and mechanical protection for transformer winding installation.
Internal Routing Section
The protected fiber can be routed along winding structures, spacers or internal support positions according to transformer design.
Interfaz del dispositivo de monitoreo
The sensor connects to a fiber optic temperature monitoring device that provides excitation, signal detection, temperature calculation and output functions.
Polyimide Protected Sensor vs Conventional Fiber Optic Temperature Sensor
The main difference is not the optical measurement principle, but the protection and installation structure. Polyimide protected sensors are optimized for transformer winding environments, while conventional probes are often used for general surface, cabinet or contact temperature measurement.
| Elemento de comparación | Polyimide Protected Fiber Optic Temperature Sensor | Conventional Fiber Optic Temperature Sensor |
|---|---|---|
| Objetivo principal | Embedded or winding-installed transformer hotspot measurement | Medición de la temperatura en un punto general |
| Protection material | Polyimide insulated protective structure | Depends on housing, such as stainless steel, PTFE, plastic sleeve or armored tube |
| Posición de instalación | Transformer winding, spacer area, internal hotspot position | Cabinet surface, switchgear contact, busbar joint or general equipment point |
| Flexibility | Suitable for compact routing and winding-related installation | Depends on probe housing and mechanical structure |
| Uso en baño de aceite | Designed for transformer oil environments | Requiere la selección de materiales adecuados |
| Insulation focus | High-voltage transformer internal insulation compatibility | General electrical isolation depending on application |
| Lógica de selección | Choose for oil-immersed transformer winding hotspot monitoring | Choose for general optical temperature measurement applications |
Where Is the Sensor Installed Inside an Oil-Immersed Transformer?
Zona de mayor actividad de sinuosos
The sensing tip can be arranged near the expected winding hotspot to measure the local temperature more directly.
Spacer or Support Position
The protected fiber can be routed along spacer or support structures to keep the sensing position stable during transformer operation.
Área de final de bobinado
The sensor can be installed in selected winding end positions according to the transformer design and thermal analysis result.
Internal Temperature Monitoring Point
For customized transformer designs, the sensor can be placed at internal points where oil temperature alone cannot reflect the actual hotspot condition.
Why Measure Transformer Winding Hotspot Temperature Directly?
Oil temperature can show the general thermal condition of a transformer, but it may not fully represent the highest temperature inside the winding. Winding hotspot temperature is closely related to insulation aging, overload risk and transformer service reliability.
More Direct Thermal Data
Embedded optical temperature sensing helps obtain temperature data closer to the real hotspot position.
Better Support for Load Management
Winding temperature data can support transformer loading decisions and thermal protection strategies.
Useful for Long-Term Asset Monitoring
Continuous internal temperature measurement provides useful data for maintenance planning and transformer condition assessment.
Opciones de personalización
Diámetro de la sonda
The probe can be customized for winding gaps, spacer positions and compact internal transformer structures.
Longitud de la fibra
The fiber can be designed according to the distance between the internal measuring point and the monitoring device.
Estructura de protección
The protection structure can be adjusted according to winding installation, oil environment, insulation requirement and mechanical routing path.
Sensing Tip Position
The sensing tip can be configured for embedded placement, surface contact or internal hotspot measurement according to transformer design.
Coincidencia de dispositivos de monitoreo
The sensor can be matched with single-channel or multi-channel fiber optic temperature monitoring devices according to the number of measuring points.
How to Select the Right Sensor
Confirmar el tipo de transformador
Confirm transformer capacity, winding structure and whether the sensor is installed during manufacturing or maintenance.
Confirm Hotspot Position
Define the expected hotspot location based on transformer design, thermal calculation or monitoring requirement.
Confirmar el método de instalación
Check whether the sensor will be embedded, routed along a spacer, fixed near a winding or placed at another internal point.
Confirm Insulation Requirement
Consider voltage level, insulation distance, mechanical pressure and long-term oil-immersed operation.
Confirmar la cantidad de puntos de monitoreo
The number of measuring points determines the required monitoring device channel quantity.
Información recomendada para la selección de sensores
| Información requerida | Ejemplo |
|---|---|
| Tipo de transformador | Transformador de potencia en aceite, transformador de distribución o transformador especial |
| Posición de medición | Winding hotspot, spacer area, winding end or internal temperature point |
| Etapa de instalación | Evaluación de la instalación de fábrica, la instalación de mantenimiento o la modernización |
| Número de puntos de medición | Un punto o varios puntos |
| Mechanical structure | Embedded, routed, fixed near winding or customized |
| Entorno operativo | Transformer oil, high voltage, internal pressure, long-term operation |
| Dispositivo de monitoreo | Dispositivo de monitoreo de temperatura por fibra óptica de un solo canal o multicanal |
Preguntas frecuentes
What is a polyimide protected fiber optic temperature sensor?
It is a fluorescent fiber optic temperature probe with a polyimide protected insulation structure for transformer winding hotspot measurement.
Why is polyimide used for transformer winding temperature sensors?
Polyimide is suitable for flexible, insulating and oil-immersed installation structures inside transformer winding environments.
Is this sensor used for oil temperature or winding temperature?
It is mainly used for winding hotspot temperature measurement, which is different from general oil temperature measurement.
Can the sensor be installed inside an oil-immersed transformer?
Yes. The sensor is designed for internal transformer applications when the structure and installation method match the transformer design.
How does the fluorescent lifetime principle work?
The sensing material emits an afterglow signal after optical excitation, and the temperature is calculated from the decay lifetime of that signal.
How is it different from a conventional fiber optic temperature probe?
The key difference is the polyimide protected structure, which is optimized for oil-immersed transformer winding installation.
Can the fiber length and probe structure be customized?
Yes. The fiber length, probe diameter, protection structure and sensing tip position can be customized according to transformer requirements.
¿Qué dispositivo de monitoreo se requiere?
The sensor needs to work with a fiber optic temperature monitoring device that provides optical excitation, signal detection and temperature output.
Is it suitable for long-term transformer monitoring?
Yes. It is designed for long-term embedded monitoring when properly selected and installed according to operating conditions.
¿Qué información se necesita para la selección?
Transformer type, hotspot position, installation method, insulation requirement, measuring point quantity and monitoring device requirement are normally required.
Polyimide Protected Fiber Optic Temperature Sensor for Transformer Winding Hotspot Monitoring
The polyimide protected fiber optic temperature sensor is designed for internal temperature measurement in oil-immersed transformer windings. Its lifetime-based fluorescent sensing principle, optical insulation structure and flexible polyimide protection make it suitable for long-term hotspot monitoring in high-voltage transformer environments.
