Improved voltage-current mode feeder automation system based on GPRS

To improve traditional voltage-time mode feeder automation system, and considering the problems of GPRS and as security vulnerability and communication interrupt and delay, an improved voltage-current mode feeder automation system based on GPRS is presented. GPRS is only for sending command of close blocking, not for telecontrolling switch to open or close. Load break switches are equipped with simplified current type FTUs. Master station performs data acquisition and fault analysis. Fault processing involves two phases: (1) Master station determines fault section and sends commands of close blocking to FTUs to complete fault isolation; (2) Feeder lines restore the healthy areas according to traditional voltage-time scheme. The shortage impact for healthy areas on restoration of traditional schemes is eliminated. Relatively high robustness for GPRS abnormal situations can be obtained to avoid incorrect switch actions. The performance can meet the practical demands, and dispatchers can monitor the situation of feeder lines. The application field of ldquolocal control typerdquo feeder automation system is expanded.