The Principle Of Three Side Longitudinal Differential Protection And Application In Beijing Area

Power System Protection and control devices are one of the important components of the electric power system on.It is very important to power system safe and stable operation.At present,the two sides fiber current differential protection has been developed more mature,but the traditional circuit protection device is difficult to meet the requirements of T-connected line because of the operating mode and heavy system oscillation,difficult set value setting.In order to adapt to different forms of primary connection,and improve power supply,a three-terminal or multi-terminal longitudinal differential protection is proposed.In this paper,the principle of three-terminal pilot differential protection is introduced and three-terminal sample reliable synchronization problem is concerned.Combined with the practical application in Beijing area,the three side of the differential in the Beijing area the application prospect is obvious.