Abstract:The anti-interference design of integral module is the key problem in the development of electronic transformer. In order to adapt to the actual operation environment in the digital substation, enhance the operation stability of the electronic transformer, this paper analyses the realization principle of integral module for electronic transformer, researches the source of interference of electronic transformer and its influence on the working characteristics of integral module. Aiming at the problems of limited filtering ability, low sampling rate, frequency overlap of high frequency signal, which leads to abnormal output of integration module in electronic transformer, the corresponding software and hardware solutions are put forward.The software integration is used to avoid data transmission error, the high-order filter circuit is used to suppress high-frequency signal input, and the feasible technology such as reducing the sampling distortion of high-frequency signal is improved. The anti-interference ability of the electronic Transformer integration module in engineering application is enhanced. The technical scheme studied in this paper can eliminate the influence of external high frequency interference on the software integration function, and effectively improve the operation reliability of the electronic transformer based on the Roche coil.