Monitoramento de temperatura do transformador, complete guide on how to choose a good temperature sensor-INNO

O monitoramento da temperatura do transformador é crucial para garantir a operação segura e estável dos sistemas de energia e prolongar a vida útil dos transformadores; Sensores fluorescentes de fibra óptica apresentam bom desempenho no monitoramento de temperatura de transformadores devido à sua alta precisão, resistência à interferência eletromagnética, e resistência de alta tensão. Eles podem monitorar a temperatura interna dos transformadores em tempo real e com precisão, evitando falhas de superaquecimento.

Medição de temperatura do transformador

A importância e os métodos de Monitoramento da temperatura do transformador e as vantagens dos sensores fluorescentes de fibra óptica

1、 A importância do monitoramento da temperatura do transformador

1.1 Garantir a operação segura do equipamento

Os transformadores desempenham um papel crucial no sistema de energia, conversão de energia elétrica de alta tensão em energia elétrica de baixa tensão. Durante a operação, condições ambientais adversas e flutuações na carga de energia podem fazer com que a temperatura dos transformadores suba. If the temperature cannot be monitored in a timely manner, it may cause damage to the internal components of the transformer, leading to safety accidents such as fires. Through temperature monitoring, abnormal temperature increases can be detected in a timely manner, and measures can be taken to avoid accidents and ensure the safe operation of transformers.

1.2 Extend the service life of equipment

Excessive temperature can accelerate the aging of insulation materials and other components inside the transformer, shortening its service life. Continuous temperature monitoring helps to control the operating temperature of transformers within a reasonable range, reduce component losses caused by high temperatures, and thus extend the service life of transformers.
Ensure the stability of the power system
Transformers are the core equipment of the power system. Once a transformer malfunctions due to temperature issues, it may affect the stability of the entire power system, leading to power outages and other accidents. Timely temperature monitoring can provide early warning of potential faults and ensure stable power supply to the power system.

2、 Method for Monitoring Transformer Temperature

2.1 Traditional methods

Thermometer method
This method measures temperature by installing a thermometer on the transformer casing or a specific location. Por exemplo, common glass liquid thermometers, bimetallic thermometers, etc.. No entanto, this method can only measure the surface or local temperature of the transformer, and cannot accurately reflect the temperature situation of key internal parts (como enrolamentos), and the accuracy is relatively low.
Thermocouple method
Thermocouples use the thermoelectric effect to convert temperature into a potential difference for measurement. No entanto, thermocouples are susceptible to electromagnetic interference, and in environments such as transformers with strong electromagnetic fields, measurement accuracy may be affected. Além disso, their lifespan is limited and they need to be replaced regularly.

2.2 Modern Methods – Medição de temperatura de fibra óptica (including Fluorescence Fiber Optic Sensor Temperature Measurement)

detecção de temperatura distribuída

Based on the backward Raman scattering effect of optical fibers, temperature distribution at different positions can be measured along the fiber. It can perform comprehensive and long-distance temperature monitoring on transformers, with advantages such as wide measurement range and high accuracy.
Fiber Bragg Grating Temperature Measurement
Fiber Bragg Grating is sensitive to physical quantities such as temperature and strain, and measures temperature by detecting changes in the grating’s reflection wavelength. It can achieve multi-point measurement and has good stability and anti-interference ability.

Fluorescence fiber optic sensor for temperature measurement
Princípio: The basic principle of a fluorescent fiber optic sensor is to excite a fluorescent medium with blue violet light to produce fluorescence. The lifetime of the fluorescence decreases with increasing temperature, so the purpose of measuring temperature can be achieved by detecting the lifetime of the fluorescence. When the excited beam of light enters the winding, the fluorescent molecules will absorb the energy of the beam and emit a fluorescent signal. Medindo a vida útil do sinal fluorescente, a temperatura do enrolamento pode ser determinada indiretamente.

Aplicação em transformadores: Sensores de fibra óptica podem ser instalados nos dissipadores de calor, enrolamentos, anéis coletores, e outras peças dentro do transformador para obter medição de temperatura completa e multiponto. Combinando sensores de fibra óptica com sistemas de aquisição e processamento de sinais, o monitoramento em tempo real das mudanças de temperatura nos transformadores pode ser alcançado, riscos de falha podem ser previstos, e a operação normal dos transformadores pode ser garantida.

3、 Vantagens dos sensores fluorescentes de fibra óptica

3.1 Forte capacidade de resistir à interferência eletromagnética

No ambiente operacional de transformadores, existe um forte campo eletromagnético, e sensores de fibra óptica fluorescentes não são afetados por interferência eletromagnética, evitando que o problema da precisão da medição seja afetado pelos métodos tradicionais de medição de temperatura (como métodos de termopar) neste ambiente, e pode medir a temperatura de forma estável e precisa. It can work normally in complex electromagnetic environments both inside and outside transformers, making it particularly suitable for temperature monitoring of transformers in power systems.

3.2 Alta precisão

Due to the high sensitivity of fluorescent materials to temperature changes, fluorescent fiber optic sensors can accurately measure temperature. Research shows that the accuracy of fluorescence temperature measurement for transformer windings can reach 0.1 graus, which helps to more accurately monitor temperature changes in transformers, detect small temperature anomalies in a timely manner, and provide reliable basis for fault warning.

3.3 Comprehensive temperature measurement capability

It can achieve comprehensive temperature measurement of transformer windings and other parts, sem ser afetado por falhas locais ou condições de trabalho complexas, and can provide overall temperature distribution information of the transformer. Por exemplo, Innolux fluorescence temperature measurement technology can achieve comprehensive temperature measurement of transformer windings and real-time, monitoramento contínuo de temperatura, which helps to comprehensively understand the operating status of transformers.

3.4 Widely applicable environment

Materiais fluorescentes têm forte durabilidade e estabilidade, e sensores podem manter estabilidade de alto desempenho durante o uso a longo prazo. Adequado para uma ampla gama de temperaturas ambientais, desde menos Baidu até várias centenas de graus Celsius, it can adapt to various harsh working environments that transformers may face, and can work normally in both high-temperature operating conditions and cold outdoor environments.

3.5 Quick Response

Fluorescent fiber optic temperature sensors have fast response times, can monitor temperature changes in real time, e responda imediatamente. This helps to capture sudden changes in transformer temperature in a timely manner, respond quickly to abnormal temperature conditions inside the transformer, and take timely measures to avoid the occurrence and development of faults.