The paper introduces the working principle and technical requirements of the dedicated temperature relay for tractive transformer fo the EMU.Referring to JJF 1908-2021 Calibration specification for bimetallic thermometers,the calibration device for the indication error of dedicated temperature relay for tractive transformers of the EMU is de-signed,and the uncertainty of the calibration results for indication error is evaluated.The results indicate that the ex-panded uncertainty of the calibration results for the indication error of the dedicated temperature relay for tractive trans-former of the EMU is less than 1/4 of the absolute value of the maximum allowable error of the temperature relay,which meets the requirements for dissemination of quantity value.The successful development of the calibration device pro-vides a reference for the formulation of the verification regulation or calibration specification for the dedicated tempera-ture relay for tractive transformer of the EMU.
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