Patent ID: 8473609
Filing Date: 2013-06-25
Classification: H04L

Abstract:
1. A data transmission method for a substation monitoring control system that includes a server connected to a line terminal on substation premises via a transmission line and implements transmission between the server and an upper level control center, the server performing aggregate signal processing for n-to-one signal transmission, in which a plurality of (n) signals from a plurality of line terminals on the substation premises are aggregated into a single aggregate signal bound for the upper level control center and the aggregate signal is transmitted to the upper level control center, the aggregate signal processing for n-to-one signal transmission including: waiting processing for, from a time point where a first constitutional element signal constituting a specific aggregate signal bound for the upper level control center reaches the server until a wait time that is based on a preset condition elapses, waiting for another constitutional element signal of the specific aggregate signal to arrive; and time adjusting processing for extracting an earliest generation time from generation times attached respectively to constitutional element signals arriving during the waiting processing, and attaching the extracted time as a generation time of the specific aggregate signal, the preset condition includes at least one time specification condition from among a selection type time specification condition in which an employed wait time is selected from one or a plurality of preset times having fixed lengths, respectively, and a calculation type time specification condition in which the employed wait time is calculated from a preset time having a fixed length in accordance with a number or a ratio of signals transmitted through a predetermined signal transmission method, from among the constitutional element signals constituting the specific aggregate signal, and includes an arrival specification condition in which a time required for all of the constitutional element signals constituting the specific aggregate signal to arrive is set as the wait time, and during the aggregate signal processing for n-to-one signal transmission, the server implements the waiting processing after setting a first wait time on the basis of the time specification condition and setting the time required for all of the constitutional element signals constituting the specific aggregate signal to arrive as a second wait time on the basis of the arrival specification condition, and terminates the waiting processing when one of the wait times elapses.