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In digital electric power metering system, the sampled values of currents and voltages are transferred according to IEC61850-9-1/2 protocol. Quantization error will be introduced because the transferred data bit is limited. The quantization error introduced by IEC61850-9-1/2 is researched. The mathematical formula of uncertainty introduced by quantization error is achieved, and it accords well with the simulation results. The influence to actual meter of different accuracy levels is discussed

Research on the Quantization Error Introduced by IEC61850-9-1/2 in Digital Electric Power Metering System