Fluorescencyjne światłowodowe czujniki temperatury: The Best Solution for Transformer Winding Hot Spot Monitoring-INNO

In the extreme internal environment of transformers—characterized by high voltage, silne pola elektromagnetyczne, and high temperatures—fluorescent fiber optic temperature sensors are widely regarded as one of the best solutions available today, especially for applications that require precise, niezawodny, and intrinsically safe monitoring of critical areas such as winding hot spots.

Principle of Fluorescent Fiber Optic Temperature Sensors:

The core of the fluorescent fiber optic sensor is a special fluorescent material coated at the end of the fiber or at a specific point. When excitation light of a specific wavelength (usually emitted by an LED or laser) is transmitted through the fiber to the fluorescent material, the material is excited and emits fluorescence of a specific wavelength. The characteristics of this fluorescence (czas zaniku/żywotność) zmieniają się bardzo precyzyjnie i powtarzalnie wraz z temperaturą otoczenia, w którym znajduje się materiał fluorescencyjny. Czujnik mierzy temperaturę, wykrywając zmiany w czasie życia fluorescencji (a nie intensywność). Wykrywanie żywotności oznacza, że nie mają na nią wpływu wahania źródła światła, utrata zgięcia włókien, lub utrata złącza, zapewniając niezwykle wysoką stabilność i niezawodność.

Dlaczego fluorescencyjne czujniki światłowodowe są najlepszym wyborem do monitorowania transformatorów

Iskrobezpieczeństwo i izolacja elektryczna:
Samo włókno wykonane jest ze szkła kwarcowego, który jest doskonałym izolatorem elektrycznym.
Żadne części metalowe nie przedostają się do obszaru wysokiego napięcia, całkowicie eliminując ryzyko zwarć, wyładowania, lub nawet eksplozje spowodowane wadami izolacji lub wprowadzeniem metalowych przewodów, jak w przypadku tradycyjnych czujników (takie jak czujniki RTD i termopary).
The sensor probe requires no power supply, only an optical signal provided at the low-voltage control room end.
Excellent Electromagnetic Interference Resistance: Optical fiber transmits optical signals and is completely immune to any form of electromagnetic interference generated during transformer operation, such as strong power frequency electromagnetic fields, harmonia, stany przejściowe, and partial discharges. Measurement results are stable and reliable.
Wysoka dokładność i stabilność: Fluorescence lifetime temperature measurement technology is insensitive to light source fluctuations and fiber loss, achieving high measurement accuracy (typically up to ±0.5°C or better). The fluorescent material is physically and chemically stable, resistant to aging, with excellent long-term stability and minimal drift.
High Temperature and Harsh Environment Resistance: Quartz fiber and special fluorescent materials (such as certain rare-earth-doped materials) can withstand extremely high temperatures (zazwyczaj >200°C, with special designs over 300°C), fully meeting the needs of transformer hot spot monitoring (hot spot temperatures can far exceed 105°C). Resistant to oil and chemical corrosion (transformer oil environment), and mechanically stable.
Bezpośredni pomiar gorącego punktu: The fiber is extremely thin and flexible (diameter usually less than 250 mikrony), allowing direct embedding between winding pancakes, pressing pads, or closely against the conductor surface, umożliwiając bezpośrednie, in-situ measurement of the most critical hot spot temperature. This is impossible for other non-invasive methods (takie jak podczerwień).
Pomiar wielopunktowy: Optical signal loss in optical fibers is extremely low, making it suitable for transmitting signals from high-voltage hazardous areas to safe control rooms. The system can be designed for multi-point measurement (arranging multiple fluorescent probes on one IF-C fiber optic temperature transmitter demodulator), monitoring temperatures at different parts of the transformer.
Long Service Life and Low Maintenance: The fiber optic sensor has a simple structure, żadnych ruchomych części, and in a stable transformer oil environment, its service life is very long (usually matching the transformer’s lifespan), and it is almost maintenance-free.

Comparison with Other Transformer Temperature Monitoring Methods

Metoda monitorowania	Zalety	Wady	Suitable for Transformer Hot Spot Monitoring?
Fluorescencyjny czujnik światłowodowy	Iskrobezpieczeństwo, strong EMI immunity, wysoka precyzja, wysoka stabilność, Odporność na wysoką temperaturę, direct hot spot measurement, długa żywotność, multi-point transmission	Relatively high initial cost, installation requires professional design (needs to be embedded during manufacturing or major overhaul)	Best choice
FBG Fiber Optic Sensor	Iskrobezpieczeństwo, Odporność na zakłócenia elektromagnetyczne, multipleksowanie, wysoka precyzja	Sensitive to static strain (transformer vibration, mechanical stress affects temperature accuracy), złożony i kosztowny sprzęt do demodulacji, gratings may degrade at high temperatures, usually higher cost than fluorescent fiber	Usable, but inferior to Fluorescent Fiber Optic Sensor
Czujnik rezystancyjny/termopara	Dojrzała technologia, stosunkowo niski koszt, wysoka precyzja	Requires metal wires to enter high-voltage area, risk of insulation breakdown and short circuit, susceptible to strong EMI, wires may introduce measurement errors, cannot be safely and reliably installed inside high-voltage windings, relatively short lifespan	Not suitable for critical hot spots
Termografia w podczerwieni	Bezdotykowy, can scan surfaces	Can only measure surface temperature, cannot measure internal hot spots, greatly affected by oil contamination/window transparency/emissivity, stosunkowo niska dokładność, drogi (high-end equipment), requires shutdown or special windows	Not suitable for internal hot spots
Top Oil Temperature Gauge	Prosty, niski koszt	Only reflects average oil temperature, seriously lags behind winding hot spot temperature, cannot provide local overheating warning	Not suitable

Why Transformers Must Use Fiber Optic Sensors (Especially Fluorescent Type)?

Transformers are the core equipment of the power grid. The winding hot spot temperature is the key factor determining their load capacity and lifespan, and is also one of the main causes of failures. Traditional temperature monitoring methods face insurmountable challenges inside transformers:

High voltage insulation risk: Introducing metal wires is a huge safety hazard.
Strong electromagnetic interference: Causes electronic sensor signal distortion or even failure.
High temperature environment: Ordinary sensors cannot operate stably for long periods.
Critical points are difficult to reach: Internal hot spots in windings require miniature, flexible sensors to embed.

Fluorescent fiber optic sensors perfectly solve all these problems:

Bezpieczeństwo: All-fiber, bez metalu, iskrobezpieczne.
Niezawodność: Odporny na zakłócenia elektromagnetyczne, high temperature resistant, long-term stable.
Precyzja: Directly measure the most critical winding hot spot temperature.
Długie życie: Lifespan matches the transformer, bezobsługowy.

Streszczenie

For transformers that require the highest safety level, the most reliable data, and the most precise hot spot temperature monitoring (especially large high-voltage and ultra-high-voltage transformers), fluorescent fiber optic temperature sensors are currently the undisputed best choice. They overcome the fatal flaws of traditional methods, providing an intrinsically safe, Przeciwdziałanie zakłóceniom, wysoka precyzja, odporny na wysoką temperaturę, and long-life solution. They can be directly embedded in the winding to measure the core hot spot temperature, providing crucial data support for transformer safe operation, optymalizacja obciążenia, ocena stanu, and life prediction. Although the initial cost is higher and installation needs to be planned during manufacturing or major overhaul, the safety improvement, operational reliability assurance, and potential fault prevention value make it an indispensable key monitoring technology for modern intelligent transformers.