At present, all kinds of low-voltage distribution boxes are developing toward miniaturization and compactness. Because the box is relatively enclosed with narrow internal space, and electrical equipment with linear fiber optic heat detectors operates overloaded for a long time, heat accumulates and the temperature rises. The temperature of these heating parts cannot be monitored manually in real time, so long-term high-temperature operation can easily damage the flame retardancy of electrical equipment, affect the normal operation of the system and cause property losses.

To solve the problems of the current visual low-voltage distribution cabinet — manual supervision, high labor intensity, inaccurate detection and inability to continuously monitor multiple points — a low-voltage distribution cabinet with an intelligent temperature measurement and monitoring system is provided. Current fiber optic measurement and sensing technology for high-voltage switchgear has no automatic detection system. During long-term operation of high-voltage switchgear, power cables age, switch contacts age or have excessive loop resistance, and long-term high current and long-term overload cause heating of cables and switches, easily leading to thermal cracking of contacts, high-temperature deformation or carbonization of insulating shields, and accidents.

Copper busbar trunking has widely replaced cables in indoor low-voltage power transmission trunk projects and has become an important branch of power distribution equipment, widely used in various industries. However, in the actual application of copper busbar trunking, due to long-term operation in air and the influence of ambient temperature and humidity, thermal expansion and contraction, surface scaling, oxidation or corrosion occur, resulting in loose contacts and poor contact. The incoming-line joints of the copper busbar may show abnormal overheating, potentially causing fires or serious accidents. The busbar trunking is fully enclosed during operation, so the fiber Bragg grating temperature sensor must monitor the temperature of the copper busbar incoming-line joints inside the trunking to improve operational reliability.