Abstract:At present, distribution network is not dependent on the voltage, but through the current sampling value method to calculate the direction of flow, for the sampling values at both ends of the synchronous high demands are put forward. Put forward by network transmission to adjust the current sampling values of synchronization algorithm, phase difference on both ends of the current are calculated, at the same time have the effect of direction overcurrent protection. This scheme not only can well solve the synchronization of sampling values, accurate judgment flow phase, but also avoid the hardware design is too complicated, reduce the use of direction overcurrent components. This plan has set up a file in the double circuit line distribution system to test and verify.

Keywords:synchronization of sample values, directional overcurrent protection, phase difference, phase synchronization, phase out of synchronism