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.