Fiber optic temperature sensor for handcart switchgear-INNO

Due to the difference in temperature rise inside and outside the contact box of the high-voltage switchgear, the online temperature measurement device outside the box cannot directly reflect the highest temperature of the contact. Portanto, a conductive circuit heating model was established for a commonly used model of switchgear under normal and poor contact conditions of handcart contacts. The installation of existing switchgear overheating warning device sensors and analysis of temperature monitoring data provide reference, which helps to timely and accurately detect overheating hazards.

The switchgear is an important electrical equipment that plays a role in receiving and distributing electrical energy in the power system. Thanks to the development of high-voltage circuit breakers, metal enclosed handcart switchgear with convenient operation and small footprint has become mainstream. With the advancement of intelligence and miniaturization research, the internal structure of switchgear has become increasingly compact and the internal space has become narrower. Due to directly bearing user loads and poor heat dissipation, current carrying faults caused by overheating due to poor contact and other reasons have always been the main safety hazards faced by switchgear.

10kV handcart cabinet circuit breaker handcart isolation contact sistema de medição de temperatura for substations in the field of power electrical equipment

Atualmente, the 10kV handcart cabinet mainly adopts a high-voltage metal enclosed handcart vacuum switchgear (referred to as handcart cabinet), que é composto por uma sala de carrinhos de mão de disjuntores, uma sala de barramento, uma sala de TV a cabo, e uma sala de instrumentos de relé. O gabinete está equipado principalmente com disjuntores, transformadores de corrente, interruptores de aterramento, e dispositivos de exibição ao vivo. Este tipo de equipamento possui estrutura compacta, boa vedação, carrinho de mão intercambiável, manutenção simples, operação segura, e operação conveniente.
No entanto, com o aumento da carga de energia, foi descoberto que o contato de isolamento do carrinho de mão do disjuntor do carrinho de mão de 10kV apresentava aquecimento severo. Além disso, devido à estrutura compacta e boa vedação do gabinete do carrinho de mão, a posição de trabalho do contato de isolamento do carrinho de mão do disjuntor fica entre a sala do carrinho de mão e a sala do barramento. Durante as inspeções normais, the substation duty personnel cannot use infrared thermometers and thermal imaging devices to measure the infrared temperature of the handcart isolation contact. No entanto, the test regulations stipulate that the test cycle for the 10kV main transformer cabinet and busbar cabinet is once every 3 anos, and for the 10kV line cabinet is once every 6 anos; Such a long maintenance cycle, without strengthened monitoring, will seriously affect the safe and stable operation of the equipment if the temperature is too high. Durante a operação, there have been incidents where the main transformer of the 10kV handcart cabinet and the isolation contact of the busbar circuit breaker handcart overheated severely, causing the plum blossom contact to burn out, resulting in the transformer being unable to be put into operation and the entire station experiencing a power outage.

The fluorescent temperature measurement device independently developed by FJINNO for handcart switchgear is suitable for online monitoring of temperature of various types of switchgear, real-time monitoring of the temperature of switch contacts and other hot spots, in order to discover abnormal heating fault signs, prevent the occurrence of faults, and provide scientific data basis for “status maintenance” of switchgear through temperature history records, which is of great significance for the safe operation of switchgear equipment.