Abstract: The DS18B20 is a 1-wire digital temperature sensor manufactured by Dallas Semiconductor, Inc. It features digital output and testing capabilities, strong control functions, long transmission distance, strong anti-interference ability, and low power consumption. This paper details its main technical performance and application in single-point temperature control systems. Keywords: DS18B20; 1-wire; sensor; microcontroller; circuit breaker Temperature is a fundamental environmental parameter closely related to people's lives and industrial and agricultural production. Temperature measurement is indispensable in power supply. Hydraulically operated circuit breakers are crucial equipment in the power grid. Ensuring the normal operation of the hydraulic operating mechanism's oil circuit is of great significance for ensuring power grid safety. When the ambient temperature drops to a certain level, the oil flow in the circuit breaker is affected, and the increased viscosity of the hydraulic oil hinders flow, affecting the circuit breaker's characteristics. Under normal circumstances, this device displays the current temperature value. When the temperature rises or falls to a specified value, this device will immediately and automatically and safely shut off or open the heating device to prevent accidents, making it an indispensable protection device for substations. Therefore, researching temperature measurement methods and devices is of great significance in practical production. The key to temperature measurement is the temperature sensor. With rapid technological advancements, sensors have entered the third generation of digital sensors. The DS18B20 used in this temperature measurement system belongs to this type of sensor. Manufactured by Dallas Semiconductor, the DS18B20 is a single-bus temperature sensor, belonging to a new generation of intelligent temperature sensors equipped with a microprocessor. This type of sensor features small size, high accuracy, convenient interface, and long transmission distance. It is widely used in control instruments and measurement and control systems in industrial, agricultural, and military fields. For details, please click to download: Application of DS18B20 Digital Temperature Sensor in Substation Temperature Measurement