1. Key Laboratory of the Ministry of Education on Smart Power Grids, Tianjin University, Tianjin 300072, China; 2. State Grid Energy Research Institute Co. Ltd., Beijing 102209, China; 3. China Electric Power Research Institute, Beijing 100192, China

Distribution automation system(DAS)can be regarded as a kind of typical cyber-physical system. Its information part(including master station, communication network and feeder terminal unit)is important assurance for the security and reliability of power supply of the physical distribution system. Considering the influence of data transmission errors of imformation part, a method of quantitatively analyzing the influence of data transmission errors of DAS on the power supply reliability of power distribution system is presented. Firstly, an effect analysis model in feeder failure mode is developed, which includes fault location, fault isolation and fault recovery parts based on power supply reliability indices. Then, the correction model of reliability indices is proposed by introducing the influence of the data transmission errors of information part. The influence of distribution automation data transmission errors on reliability of distribution system is evaluated by taking system interruption duration and system energy not supplied as indices. The validity of the model and algorithm is verified by the case.