What is the best temperature monitoring technology for medium voltage switchgear-INNO

Why does Central Asia switchgear require temperature measurement

With the development of the national economy, the demand for electricity in various industries is increasing. The temperature of the contact points inside the high-voltage switchgear in power plants and substations increases with the increase of current. If the temperature of the contact points inside the high-voltage switchgear continues to rise, it will cause the temperature of the contact points inside the high-voltage switchgear to overheat, leading to overheating accidents of the switchgear temperature and resulting in fires and large-scale power outages. Portanto, the workload of monitoring the safe operation of electrical equipment in the power system is rapidly increasing. The operation of units in power plants and substations is not independent of each other, but requires the coordination of various links in order to work safely, effectively, and reliably. The power supply of electrical equipment is mostly achieved through switchgear groups for transmission and distribution. If one of the switchgear fails, it will inevitably affect the operation of the entire substation or substation. Com base nisso, as the main parameter for the safe operation of electrical equipment in the power system, the monitoring task of the contact temperature of high-voltage switchgear in substations is becoming increasingly heavy.

Desvantagens do termômetro infravermelho para comutadores

Excessive temperature of power equipment will directly affect its reliability. If not detected and controlled in a timely manner, the severity of overheating will have a significant impact on the performance of insulation materials and equipment life. Low voltage equipment, due to its low voltage level, typically has a higher current and higher temperature compared to high voltage equipment. In the hot summer, higher environmental temperatures and higher loads are likely to cause a sudden increase in the temperature of low-voltage equipment, leading to equipment aging, degradação do isolamento, e em casos graves, danos ao equipamento, curtos-circuitos, and ultimately power outages. Atualmente, all public distribution rooms operate in an unmanned manner, and operators only use infrared thermometers to measure the temperature of the internal busbar and outlet cable heads of the low-voltage cabinet during regular inspections. They cannot monitor equipment temperature in real time online and cannot detect safety hazards of the equipment. Nos últimos anos, some power companies have begun to attempt online temperature measurement of high-voltage equipment in distribution networks. Na verdade, in the actual operation of distribution networks, there are much more equipment failures caused by high equipment temperatures in low-voltage networks than in medium voltage networks.

The necessity of monitoring devices for medium voltage switchgear

The medium voltage switchgear is an important electrical equipment in the transmission system. External current enters the main control switch inside the cabinet through wires, and then enters the sub control switch to connect with each branch; Each branch needs to be equipped with instruments, control and protection components, monitoring components, various AC circuit breakers and other control components to control, proteger, medir, medir, and monitor the circuit.

As the usage time increases, the operating status of the switchgear will gradually deteriorate, and various signs of faults will gradually appear; Por exemplo, the conductive connections inside the switchgear may deteriorate the contact conditions due to electrical wear, vibração mecânica, and hidden defects in the equipment manufacturing process, causing an increase in contact point temperature. The temperature increase will further intensify the oxidation of the contact surface, formando um ciclo vicioso até que ocorram danos no isolamento, em última análise, levando a descargas de arco e acidentes com equipamentos. Os componentes de isolamento dentro do gabinete, devido à exposição prolongada a alta tensão e fortes campos eletromagnéticos, também pode causar envelhecimento do isolamento e poeira superficial, em última análise, levando a uma diminuição no desempenho do isolamento e causando acidentes. O disjuntor, por estar em operação há muito tempo sem ação, causa uma diminuição na função de lubrificação das partes móveis do mecanismo operacional, mudanças nas características mecânicas, e afeta a capacidade de abrir e fechar correntes normais ou de falha, que pode levar a acidentes em casos graves.

Tecnologia de medição de temperatura por fibra óptica fluorescente para painéis de distribuição

A tecnologia de fibra óptica tem características físicas únicas. The unique physical characteristics of fiber optic sensors are manifested in their fine diameter, resistência à interferência eletromagnética, corrosão, resistência a altas temperaturas, and signal attenuation ratio, leve, and the integration of information sensing and transmission. They can effectively solve measurement problems that cannot be solved by conventional detection technologies. Fiber optic itself is a good insulation material, which can isolate the high voltage between the power system and electrical temperature measurement equipment, avoiding electrical equipment safety accidents caused by temperature measurement devices. Enquanto isso, fiber optic devices are also excellent carriers for transmitting and sensing signals, solving the problem of electromagnetic interference in data transmission in the power system environment, making measurement results more accurate and reliable. Além disso, due to the small diameter, peso leve, and good flexibility of optical fibers, they can detect areas that ordinary sensors cannot detect. Fiber optic has these advantages, making fiber optic sensors increasingly widely used in online temperature measurement of electrical equipment in power systems. FJINNO’s independently developed switch cabinet sistema de medição de temperatura de fibra óptica is the most important temperature measurement technology for online temperature measurement of electrical equipment in high, médio, and low voltage switch cabinets.