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Data Synchronization
Input sampling signals, such as three-phase current and voltage, need to be synchronized if the merging unit is connected to several electronic CTs/VTs and electro-magnetic CTs/VTs. This can be solved either by GPS PPS, or by angle adjustment interpolation. The GPS PPS signal can gradually adjust the sampling interval of all intelligent sampling modules through the merging unit to realize synchronous sampling automatically. However, the synchronization accuracy of this method relies on the integrality and the accuracy of GPS PPS.
Any loss of GPS PPS may directly influence the synchronization accuracy. The other way to synchronize the data sampling is using angle adjustment interpolation, which does not rely on the GPS signal, thus has higher reliability. In practice, the mentioned two methods can be used in combination to achieve better accuracy
