The Studies Of The Power Energy Metering Method On The Neutral Point Grounded Effectively

In the electric power system of neutral point effectively, if parameter is not symmetric, the zero-phase-sequence current will appear. At this condition, the method of metering electric power energy is still of two component connection, the metering error will be brought out. Through theoretical analyses, the zero-phase-sequence current is the reason of the metering error. In this paper, the virtual instrument technique is used in accurate measurement of power energy and the power quality. The software is LabVIEW. By LabVIEW graph software, a series of functions such as DFT is realized. The hardware uses a industry control computer based on PCI bus, a signal converter and DAQ (Date acquisition card to develop).