Method for transmitting power quality data and power quality device

The invention provides a method for transmitting electric energy quality data and an electric energy quality device, and the method comprises the steps: receiving a downloading instruction of a client, the downloading instruction comprises information of target data, and the target data is one of the electric energy quality data; according to the downloading instruction and preset downloading configuration, data pieces of the target data are sequentially obtained from an external memory, the downloading configuration is used for indicating the size of the data pieces, and the size of the data pieces is smaller than that of the target data; caching the data pieces to form downloading resources of the target data; and sending the downloading resources to the client in real time until all the target data are sent. According to the method and the device, the target data are downloaded in the form of the data pieces, caching is carried out every time one data piece is acquired to form the downloading resource of t