Preferred methods for power-related measurements

Digital power and energy meters of today and tomorrow, capable of frequency analysis, offer new possibilities. Old metering concepts can be changed and refined and ambiguities due to the inability of old metering equipment can be overcome, but only if the measured quantities are defined for the prevailing nonsinusoidal conditions. A discussion is needed to separate the preferred measuring methods and measured quantities from the large number of possible quantities and methods. This paper discusses, mainly, the advantages and disadvantages of a metering that separates the fundamental power components from the other parts of the apparent power