This paper develops a novel distributed temperature
measurement system based on DSP and DS18B20 digital thermometer. The real-time
temperature of each node in the switchgear is obtained by several DS18B20s
which are connected on the 1-wire bus together. RS-485 master-slave
communication protocol is used to centralize monitoring temperatures of several
switchgear cabinets. The system also has the function of temperature alarm. The
operation of simulation experiment has showed that the system is able to
complete monitoring real-time temperatures in high voltage switchgear.