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A method and a system for measuring a quantity, such as current, of a power converter apparatus consisting of parallel-connected power converter units (FC1 - FC3), in which method a component quantity, such as component current, of each power converter unit is measured, the component quantities are transmitted digitally in serial communication format to a control unit (CU), and the component quantities are summed to produce a summed quantity, in which method: the component quantity data are transmitted to the control unit with the least significant bit (LSB) first, the summing is started as soon as the LSBs of the component quantities have been received, the LSB of the sum is transmitted further as soon as the LSBs of the component quantities have been summed, after this, the rest of the bits are summed in the order of arrival, with the most significant bit (MSB) last, and the respective summing data are transmitted further in the order of arrival as soon as the corresponding bits of the component quantities have been summed.