The IEEE Power Quality Subcommittee of the IEEE Power & Energy Society has also developed a file format called the Power Quality Data Interchange Format (PQDIF) that is similar to COMTRADE in structure but is used primarily to convey power quality data instead of transient disturbance data.
•
The COMTRADE file format has been standardised by the Power System Relaying Committee (PSRC) of the IEEE Power & Energy Society as C37.111.