蛍光光ファイバー温度センサー: The Best Solution for Transformer Winding Hot Spot Monitoring-INNO

高電圧を特徴とする変圧器の極限の内部環境, 強い電磁界, および高温 - 蛍光ファイバー光温度センサーは、現在入手可能な最良のソリューションの 1 つとして広く認められています。, 特に正確さを必要とするアプリケーション向け, 頼もしい, 曲がりくねったホットスポットなどの重要なエリアの本質安全監視.

蛍光式光ファイバー温度センサーの原理:

蛍光光ファイバーセンサーのコアは、ファイバーの端または特定の点にコーティングされた特殊な蛍光物質です。. 特定の波長の励起光を照射した場合 (通常はLEDまたはレーザーによって放射されます) ファイバーを通って蛍光物質に伝達されます, 材料が励起されて特定の波長の蛍光を発します。. この蛍光の特徴は (decay time/lifetime) change very precisely and reproducibly with the temperature of the environment where the fluorescent material is located. The sensor measures temperature by detecting changes in fluorescence lifetime (rather than intensity). Lifetime detection means it is not affected by fluctuations in the light source, ファイバー曲げ損失, or connector loss, ensuring extremely high stability and reliability.

Why Fluorescent Fiber Optic Sensors Are the Best Choice for Transformer Monitoring

Intrinsic Safety and Electrical Isolation:
The fiber itself is made of quartz glass, which is a perfect electrical insulator.
No metal parts enter the high-voltage area, completely eliminating the risk of short circuits, discharges, or even explosions caused by insulation faults or introducing metal conductors, as seen with traditional sensors (such as RTDs and thermocouples).
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, 高調波, 過渡現象, and partial discharges. Measurement results are stable and reliable.
高い精度と安定性: 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 (通常 >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.
直接ホットスポット測定: The fiber is extremely thin and flexible (diameter usually less than 250 ミクロン), allowing direct embedding between winding pancakes, pressing pads, or closely against the conductor surface, 直接を有効にする, in-situ measurement of the most critical hot spot temperature. This is impossible for other non-invasive methods (赤外線などの).
Multi-point Measurement: 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.
長寿命と低メンテナンス: The fiber optic sensor has a simple structure, 可動部品がない, 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

モニタリング方法	利点	欠点	Suitable for Transformer Hot Spot Monitoring?
蛍光光ファイバーセンサー	本質安全防爆仕様, 強力なEMI耐性, 高精度, 高い安定性, 高温耐性, direct hot spot measurement, 長寿命, 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	本質安全防爆仕様, EMI耐性, 多重化, 高精度	Sensitive to static strain (transformer vibration, mechanical stress affects temperature accuracy), complex and expensive demodulation equipment, gratings may degrade at high temperatures, usually higher cost than fluorescent fiber	Usable, but inferior to Fluorescent Fiber Optic Sensor
RTD/熱電対	Mature technology, 比較的低コスト, 高精度	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
赤外線サーモグラフィー	非接触, can scan surfaces	表面温度のみ測定可能, cannot measure internal hot spots, greatly affected by oil contamination/window transparency/emissivity, relatively low accuracy, 高い (high-end equipment), requires shutdown or special windows	Not suitable for internal hot spots
Top Oil Temperature Gauge	簡単, 低コスト	Only reflects average oil temperature, seriously lags behind winding hot spot temperature, cannot provide local overheating warning	不適切

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:

安全性: All-fiber, 金属なし, 本質的に安全.
信頼性: EMIに対する耐性, high temperature resistant, long-term stable.
精度: Directly measure the most critical winding hot spot temperature.
長寿命: Lifespan matches the transformer, メンテナンスフリー.

まとめ

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, 干渉防止, 高精度, 高温耐性, 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, 負荷の最適化, 状態の評価, 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.