Determination of an electric energy flow

A method for non-contact electric power and/or energy determination in which electric power and/or energy is ascertained from measured current and voltage values in a measurement signal processing step, the method comprising:

• arranging a device and an electric current-carrying conductor to be measured in a galvanically isolated manner;
• performing a current measurement on the electric current-carrying conductor by determining a magnetic field emanating from the electric current-carrying conductor by a first sensor;
• performing a voltage measurement on the electric current-carrying conductor by a MEMS voltmeter by determining an electric field emanating from the electric current-carrying conductor by a second sensor, by a sensor electrode arrangement being repeatedly shielded from the electric field to be measured and exposed to the electric field again by a grounded shutter, so that the sensor electrode arrangement behind the grounded shutter is alternately discharged and charged by an influence of the electric field to be measured;
• and
• offsetting two measurement signals against one another by an electric circuit and/or in a digital data processing step.

A device, comprising:

• a non-contact current measurement apparatus;
• a non-contact voltage measurement apparatus comprising a sensor for measuring an electric field strength, a sensor electrode arrangement and a grounded shutter, wherein the grounded shutter is embodied to repeatedly shield the sensor electrode arrangement from the electric field to be measured and to expose it to the electric field again, in particular the sensor electrode arrangement comprises two capacitor plates which are electrically Isolated from one another and which are interconnected by an amplifier circuit, and in particular an oscillating electrode is arranged spatially plane-parallel above these capacitor plates as a shutter, preferably along the direction of the source of the electric field to be measured, which is at a neutral reference potential and which, depending on a deflection, shields one of the two capacitor plates from the electric field to be measured, in particular embodied as a MEMS voltmeter,
• wherein at least one of the non-contact current measurement apparatus and the non-contact voltage measurement apparatus includes electromagnetic field shielding with a measurement signal processing apparatus which is embodied to ascertain an electric power and/or energy from measured current and voltage values, and wherein it comprises at least one spacer by which the device can be arranged on an electric conductor to be measured in a galvanically isolated manner therefrom.