A substation is the power distribution equipment in the power supply system that converts voltage, receives and distributes electric energy, controls the flow of electric power and adjusts voltage. As a very important electric energy conversion base, if a fire or other power accident occurs in a substation, it will inevitably cause large-scale power outages, and the linear fiber optic heat detector will have a major impact on and damage to the company's production and people's lives. Therefore, ensuring the safety and reliability of the substation and preventing fire accidents is particularly important. Among them, equipment overheating is the main hidden danger of substation fires. For example, the fixed and moving contacts of substation high-voltage cabinets and their connection points, cable terminals, cable connections and partial discharge of high-voltage cables are the key hidden danger points of large accidents. Moreover, these areas usually have voltages of several thousand or even tens of thousands of volts — it is very risky for operators to enter and investigate.

Characteristics and defects of the substation wireless temperature measurement system: wireless temperature sensors, wireless centralized receivers, substation monitoring, centralized control stations and a real-time monitoring center. The wireless temperature sensor is connected to the wireless centralized receiver via wireless communication; the wireless centralized receiver is connected to the substation monitoring via wired communication; the substation monitoring is connected to the centralized control station; and the real-time monitoring center is connected to the centralized control station. The substation monitoring is equipped with a GSM network that can send abnormal temperature alarm signals to the mobile phones of relevant staff. The real-time monitoring center, centralized control station and substation monitoring are each equipped with temperature monitoring display devices and monitor the temperature of substation equipment in real time. The substation monitoring has a preset temperature threshold and can compare the received temperature data with the preset threshold, sending abnormal alarm signals to the mobile phones of relevant managers. However, passively setting one temperature threshold makes it impossible to set multi-level alarms according to the actual environment — for example, the basic temperatures at multiple points of the substation differ greatly, so the system is prone to misjudgment, and by the time of the alarm a relatively big fire may already have formed. It cannot accurately locate the accident point, can only identify the fire area, and cannot reflect the real-time temperature status.