Abstract:A transformer is an important facility in the power system and its operation temperature should be continuous monitored. For the large temperature measuring deviation problem of some temperature measuring devices on the transformer and taking the main transformer of a certain power plant as an example, this paper conducted a temperature measuring comparison test on three common temperature measuring devices. It pointed out that the cause of temperature measuring error was the insensitivity of mechanical thermometer and proposed corresponding installation adjustment measures.

Keywords:transformer, temperature measuring device, thermal resistance, thermometer