Arrangement for the measurement of reactive power or reactive energy

An arrangement for measuring a reactive energy or reactive power comprising

• a main multiplier with first and second inputs, a signal/frequency converter, and a frequency divider all connected in series, to form a cascade circuit having at least one input and an output connected to a display,
• a 90.degree. phase shifter with a frequency dependent transfer function K having an input for receiving a first signal component of said reactive energy or reactive power, and having an output in communication with said first input of the main multiplier, said second input of the main multiplier receiving a second signal component of the reactive energy or reactive power,
• a frequency measurement circuit for measuring the frequency f of said first signal component, and
• a frequency/signal converter connected to said frequency measurement circuit for outputting at an output an output signal which is proportional or inversely proportional to K, said output of said frequency/signal converter being in communication with said at least one input of said cascade circuit so that a signal generated at said output of said cascade circuit is independent of the frequency f of the first component signal.