This recommended practice defines a procedure for naming time sequence data (TSD) files that originate from digital protection and measurement devices@ such as transient data records@ event sequences@ and periodic data logs. The filename includes@ among other features@ key portions of the information contained in the file@ including@ but not limited to@ the names of the circuit@ substation and recording device@ and the date and time of event occurrence. Purpose The purpose of this recommended practice is to define a procedure for naming TSD files@ a procedure that is needed to resolve many problems that are associated with reporting@ saving@ exchanging@ archiving@ and retrieving large numbers of files. There is no other defined standard for naming such files at this time.