O que é um sistema de monitoramento de temperatura de quadro de distribuição-INNO

Online temperature detection of high-voltage switchgear power supply system

High voltage switchgear has a metal enclosed structure that can complete the switching control of AC circuits. It is widely used in high-voltage power supply systems and plays an irreplaceable role in monitoring and measuring, line disconnection, and fault protection of high-voltage power supply systems. Indoor metal armored mobile switchgear (GÊNERO) is widely used in power supply systems due to its advantages of easy maintenance, estrutura simples, good operability, e alta segurança. No entanto, the metal fully enclosed structure of the switchgear results in poor heat dissipation, and high voltage and high current generate a lot of heat. Nessas condições, infrared temperature measurement technology cannot effectively monitor internal equipment. Portanto, o sistema de comutação de fonte de alimentação CA de alta tensão geralmente apresenta contatos de pressão de cabo, interruptor contatos superaquecimento e queima, e até incêndios e cortes de energia, o que representa uma grande ameaça ao funcionamento fiável do sistema de fornecimento de energia de alta tensão e causa enormes perdas económicas. Portanto, detecção on-line eficaz de falhas de temperatura e controle de componentes internos KYN são muito importantes. É necessário detectar oportuna e eficazmente a temperatura dos componentes dentro do gabinete fechado, controlar e lidar com os riscos de aquecimento em tempo hábil, fazer previsões corretas e diagnóstico e tratamento oportunos de falhas de aquecimento, e garantir a operação estável do sistema de alimentação de alta tensão.

Tecnologia de monitoramento de temperatura on-line para painéis de alta tensão

In order to improve the reliability of switchgear, its internal structure and functions are becoming increasingly complex, so power outage maintenance of switchgear is becoming more and more complicated and difficult. Portanto, it is necessary to conduct testing to ensure reliable operation. Domestic and foreign technological forces have conducted a large number of scientific experiments and practical applications on site, and found that fluorescence fiber temperature measurement e wireless active temperature measurement technology are very effective in temperature detection in closed systems.

Sistema de medição de temperatura de grade de fibra Bragg

The closed temperature detection technology of fiber Bragg grating was successfully developed in Ottawa in 1978, and then the technology began to develop rapidly. Breakthroughs and practical applications were made in many related fields because fiber Bragg grating has strong photosensitivity. When the physical characteristics of fiber Bragg grating, such as temperature and stress, change to a certain extent, it will cause the effective refractive index of the fiber Bragg grating core to change accordingly, and the wavelength of the grating will also change accordingly. By obtaining the wavelength change signal and converting the wavelength change pattern into corresponding level signals, temperature measurement of components sealed inside the switchgear can be achieved. Place the fiber Bragg grating sensor at the bottom of the switchgear for temperature detection. When the sensing system is working, the regulator can emit narrowband laser, which is then dispersed by multiple optical switches to reach each sensor. If the wavelength obtained is equal to the wavelength of the grating core, it is in the emission state, and the laser returns to the regulator through the multiple optical switches of the coupler. The regulator will obtain the temperature parameters of each component in the switchgear and send the information data to the upper computer through the A/D digital to analog conversion module. The software system in the upper computer has displayed the temperature signal through the display system, which can intuitively obtain the temperature parameters of the switchgear. The upper computer can also complete functions such as temperature data storage, query, aviso, e análise. The advantages of fiber Bragg grating temperature sensing are high sensitivity, tamanho pequeno, e forte capacidade anti-interferência. No entanto, the generation of its signal requires high-resolution spectra, which results in high cost and complex structure. During its construction, all lines need to be disconnected, and the fiber itself will affect the insulation performance of the system.

Wireless active temperature measurement system

The working principle of wireless active temperature measurement technology is basically the same as that of general temperature measurement technology, which uses traditional temperature sensors to obtain temperature signals, and then uses wireless data transmission to transmit the signals to the upper computer. In this design, the temperature sensor adopts a relatively traditional semiconductor or thermocouple type sensor, which requires a battery or induction coil for power supply. The battery power supply method is relatively easy to implement, but replacing the battery is a very troublesome task. The induction coil power supply requires inducing voltage from the primary measurement circuit of the device to supply the sensor. No entanto, changes in the primary side current will have a significant impact on the temperature measurement accuracy, resulting in increased noise. Resumidamente, the wireless active sensing method has a simple structure, tecnologia madura, easy use, and does not require wiring, which causes trouble. No entanto, the power supply of the sensor has become the main challenge of this system.

Wireless Passive Temperature Measurement System for Switchgear

Wireless passive temperature sensing technology. Compared with fiber Bragg grating and wireless active temperature measurement technology, it has obvious advantages in reliability, feasibility, economia, e segurança. Wireless and passive are the main technological sources for its advantages, and its main working principle is the use of surface acoustic wave (SERRA) tecnologia. Em 1885, the famous British physicist Raleigh accidentally discovered the existence of surface acoustic waves while studying seismic waves, which were later widely used in high-end technological fields such as military, radar, e comunicação. Nos últimos anos, SAW sensing technology has made new breakthroughs in reliability and accuracy, and has gradually been introduced into the temperature monitoring system of power system switchgear.

Composition of SAW sensing system

The system uses a hierarchical structure. It is divided into four layers from bottom to top, namely remote terminal layer, monitoring application layer, data transmission layer, and field device layer. It is composed of multiple wireless passive sensor networks, and the signals generated by multiple sensors are collected by a data collector and then sent to the data transmission layer through serial port or wireless data transmission mode. The data transmission layer corresponds to the interval layer in the intelligent substation, which summarizes and processes the data uploaded by multiple collectors to achieve remote intelligent control of sensors and input/output of their signals. The monitoring application layer corresponds to the station control layer, mainly used for centralized collection, aviso, monitoramento, armazenar, análise, and expert diagnosis of wireless temperature testing signals. A camada de terminal remoto é usada para gerenciamento geral do sistema e pode usar dispositivos remotos, como laptops, servidores, telefones celulares, comprimidos, etc., para obter alertas e monitoramento do status do sistema por meio de gerenciamento remoto.

Características do sistema de detecção passiva de temperatura sem fio

Resolveu várias desvantagens da rede de Bragg de fibra e da tecnologia de medição de temperatura ativa sem fio, como isolamento de linha, fonte de alimentação do sensor, fiação complexa, e altos custos. O modo de comunicação do barramento é usado, o que facilita a atualização e expansão do sistema. O sistema funciona de forma estável e confiável, e pode completar a detecção de temperatura on-line de longo prazo e o monitoramento remoto de alarme dos componentes internos do painel fechado. It can predict the heating hazards generated inside the enclosed high-voltage switchgear in advance and provide a strong foundation for its efficient and continuous operation. Ao mesmo tempo, the SAW sensing and monitoring system can also be used in technical fields such as cable or contact aging, cable fire prevention, lightning arrester fuse monitoring, transformer overload monitoring, and complex structure cable monitoring in high-voltage power supply systems, with great development prospects. Due to SAW being a new technology with insufficient maturity, there is still a lot of room for development in terms of stability. Atualmente, researchers are further improving its anti-interference and long-distance transmission capabilities to better apply and develop SAW technology. Para concluir, this article focuses on the problem of high temperature faults in high-voltage switchgear of power supply systems. Based on the shortcomings of sealing temperature detection technology, a temperature detection sensing technology that can meet the internal components of high-voltage switchgear in a sealed state, namely SAW wireless passive temperature sensing technology, is elaborated. This technology has the advantages of high accuracy, sensitive control, estrutura simples, and good reliability. With the continuous development of live detection technology in high-voltage power supply systems, traditional power outage pre test maintenance technology will be eliminated and replaced by non power outage maintenance technology. The application of SAW wireless passive temperature sensing technology in high-voltage power supply systems is of great significance in state assessment, fault monitoring, and improving maintenance efficiency. To provide reliable guarantees for the efficient operation of the power supply system, the next step for this technology is to further improve and enhance its signal anti-interference ability and transmission distance, with broad prospects.

Características de Medição de temperatura de fibra óptica fluorescente

1. Imunidade à interferência eletromagnética (fiber optic cable material is silicon dioxide, front-end temperature sensing material is inorganic material).

When the fiber optic cable is 40cm above ground, it can withstand a voltage of 100KV (this test is not a limit test).

3. The fiber optic probe is compact, and the fiber diameter of the product can reach ф 600um.

4. Velocidade de resposta rápida.

5. Flame proof and explosion-proof, o ponto de fusão da fibra óptica é 1670 ℃.

Campo de aplicação de medição de temperatura de fibra óptica fluorescente

1. Ambiente com forte campo magnético e interferência de campo elétrico.

2. Ambientes inflamáveis e explosivos.

3. Médico, petroquímico e outros ambientes.

4. Lados de alta e baixa tensão dos enrolamentos do transformador.

5. Ambiente de locomotiva de trânsito ferroviário.