Automatic evaluation of transmission protection using information from digital fault recorders

Digital fault recorders are increasingly being used by electric utilities throughout the world. The information from these records enables the power system engineer to determine and assess, by analysis, the power system response and the protection performance during fault conditions. Many fault records can be generated following certain incidents, particularly multiple faults caused by adverse weather conditions. In order to substantially reduce the time and effort required for this analysis, there is a need for tools which automate this process. This paper describes software (FR10A and AFRA) that has been developed for this purpose in The National Grid Company plc