What is the safest temperature measurement method for dry-type transformer windings-INNO

Overview of solutions for fluorescent fiber optic temperature controllers for dry-type transformers
The measurement range specified in the “Electronic Temperature Controller for Transformers” (JB/T7631-2016), which uses Pt100 as the traditional temperature sensor, só pode ser limitado abaixo de 1000V, and this sensor is made of metal material, which poses a safety hazard. Portanto, temperature sensor probes and leads for measuring transformer winding temperature have higher requirements.

The fiber optic temperature controller uses our company’s independently developed sensor de temperatura de fibra óptica fluorescente as the temperature sensing element. This temperature sensing element is immune to electromagnetic interference and resistant to high voltage (100KV/fiber to ground lead distance of 0.4m). Fluorescent fiber optic temperature measurement completely solves potential safety hazards from the source of temperature measurement and improves the safety level of transformers.

Target of sistema de medição de temperatura de fibra óptica fluorescente para transformadores do tipo seco
For the operating environment of dry-type transformers, isolation and shielding from external electrical interference signals are achieved from the power supply, signal input end, signal output end, and temperature control box shell.
No metallic substances, segurança intrínseca.
In response to vibration, pó, umidade, oil and other on-site working environments, multi-layer protective measures are taken to ensure that the fiber optic controlador de temperatura has good electromagnetic compatibility, ensuring stable and reliable operation.
Design principles of fluorescent fiber optic temperature measurement host for dry-type transformers
Principle of practicality
The system construction adheres to the principle of practicality. On the basis of practicality, progressiveness and foresight are considered, and standard, advanced and mature products and development platforms are selected to build a system that is practical and solves practical problems.

Standardization principle
The system software and hardware platforms and application development tools used in application construction should comply with national standards, standards of the Ministry of Information Industry, relevant technical specifications and requirements of the company.

The principle of uniformity
Seguindo a política de gestão centralizada da informação, planejamento geral, projeto geral, e implementação passo a passo, o processo de implementação incorpora quatro princípios unificados: liderança unificada, planejamento unificado, padrões unificados, e organização e implementação unificadas.

Princípio de confiabilidade
The software and hardware resources need to ensure the uninterrupted and reliable operation of the sistema de medição de temperatura de fibra óptica para 7 × 24 horas. Portanto, it is necessary to equip a complete design of reliability measures to ensure the highly reliable operation of the system and fully consider the reliability requirements of key system applications.

Mecanismo de segurança confiável
Este sistema adota uma série de medidas de criptografia seguras, com um embutido 64 algoritmo de criptografia de bits. The system has higher security and can effectively prevent data leakage and theft, ensuring the security, precisão, and integrity of the system’s data, and preventing illegal operator operations and legitimate operator illegal operations.

The operation interface is simple, friendly, and highly intelligent
O sistema verifica automaticamente a legalidade dos dados de entrada e fornece avisos amigáveis para erros do operador.

Stable operation and reliable data.
A plataforma é fácil de operar, fácil de dominar, and the installation process is simple. Data can be automatically generated into various reports as needed, improving management efficiency.
Principle of Fluorescent Fiber Optic Temperature Measurement
A sonda de fibra óptica consiste em três partes: Conector ST, cabo de fibra óptica, e fim de detecção de temperatura final. O conector ST é a peça de conexão com o módulo fotoelétrico; O cabo de fibra óptica é a parte de transmissão, com fibra de quartzo dentro. A fibra de quartzo possui revestimento e revestimento externo, e uma capa protetora de Teflon na parte externa; The end temperature sensing end contains temperature sensitive rare earth materials, which excite fluorescence after being irradiated by fixed wavelength light. Após a excitação parar, the relationship between the decay time constant of fluorescence afterglow and temperature is a quasi exponential function. The temperature can be obtained by measuring the time constant of afterglow; A fibra óptica é resistente a altas temperaturas de 200 ℃ e tem um diâmetro externo de 3 mm. Raio de curvatura de longo prazo de 13,2 cm. Short term bending radius 4.4cm

The sensor probe material is rare earth fluorescent material, and its biggest advantage compared to other optical fiber temperature measurement principles is that temperature measurement is independent of light intensity. It has strong compatibility with the inconsistency of fluorescence intensity, optical path attenuation, and circuit drift in hardware. Portanto, it is not affected by electromagnetic interference and can withstand high voltage, making it very suitable for high voltage, campo magnético forte, flammable and explosive temperature measurement occasions.

Introduction to wiring and installation of fiber optic temperature controllers for dry-type transformers
1.1 Structural framework
O sistema consiste em três partes: a fluorescent fiber optic temperature controller, uma sonda de fibra óptica fluorescente, e software de comunicação de fibra óptica.

The data transmission between the backend system and the temperature measurement terminal adopts RS485 communication method.

All data collection, gerenciamento, and temperature display are completed by communication software, and the system mainly realizes data collection and monitoring of temperature measurement. The fiber optic temperature measurement terminal integrates multi-channel fluorescent optical fibers, providing external RS485 communication, anti-interferência, and corrosion-resistant design.

Application functions of fiber optic temperature controller system for dry-type transformers
1.1 Monitoramento em tempo real
A densidade de coleta de dados pode ser definida de acordo com as necessidades do cliente, e o sistema coletará dados regularmente com base nos parâmetros definidos. Então, ele será exibido em forma de tabela ou desenho de curva para obter monitoramento em tempo real. Monitoramento em tempo real do status de operação do equipamento; Monitoramento e registro em tempo real da temperatura do reator.

1.2 Basic functions
1) Consulta de dados de temperatura

1. Você pode consultar dados de temperatura para datas específicas, navegar, imprimir, e exportar para Excel.

2) Armazenamento histórico de dados de temperatura

1. Registrar permanentemente dados de temperatura

Introduction to fiber optic temperature controller for dry-type transformers
2.1 Principais características
The fiber optic temperature controller is embedded installation. This product has unique technical advantages in temperature measurement in special environments such as high voltage, forte interferência eletromagnética, etc.. The temperature hotspot and measurement signal receiving part of the fluorescent sensor de temperatura de fibra óptica do not use electrical connections, que pode funcionar com alta precisão e estabilidade por um longo tempo, melhorando significativamente sua faixa de aplicação. The fiber optic temperature controller has high accuracy and sensitivity, is resistant to high pressure and can be remotely monitored, has a long lifespan, é de tamanho pequeno, torna a manutenção do instrumento simples e conveniente, and ensures safe transportation.

2.2 Funções principais
Provide three winding temperature measurement; Função de ventilador de resfriamento de partida automática/manual; Função de compensação digital para valores de exibição de cada canal
The digital tube displays the temperature of the transformer’s hot spot on a circuit;
Fornece função de caixa preta, which can record temperature data and historical maximum temperature before three power outages;
Fornece função de alarme de abertura do ponto do gabinete da porta do transformador;
Provide functions such as over temperature alarm, alarme de falha, viagem, etc.
Fornece função de comunicação RS485, communication with time mark can receive timing or MODBUS-RTU protocol (Função F)
2.3 Additional features
Fornecer 4 funções de saída de corrente analógica independente 4-20mA; (Função E)
PTC nonlinear resistance sensing temperature measurement protection function; (C function)
Função de alarme para taxa de aumento de temperatura do enrolamento e taxa de aumento de temperatura do núcleo de ferro;
O protocolo de comunicação pode adotar métodos como Profibus, IEC60870-5-103, Comunicação Ethernet, etc.;