As improvement of measurement technique and power system management

var-hour meter techniques have made great progress. Different reactive energy measure theories are adopted for different circuits and many reactive energy measure methods are developed to meet different requirements of consumers. Measurement theory of var-hour meter for sinusoidal and nonsinusoidal circuit are presented in this paper and the whole reactive energy measurement methods for electromagnetic or electronic var-hour meters are introduced so that a systematic knowledge and more reasonable selection on reactive energy measurement theories and methods can be achieved.