Electric meter

Electric meter for electrical consumption measurement at an electrical load, comprising:

• a) a current measuring device for measuring a charging current which flows via a charging cable to a transfer point for the load, the transfer point being located in a plug of the charging cable,
• b) a voltage measuring device for voltage measurement,
• c) an evaluation unit adapted for determining the line losses occurring in the charging cable in dependence on the voltage measurement by the voltage measuring device, wherein
• d) the voltage measuring device is adapted to measure the voltage directly at the transfer point of the charging cable in order to determine line losses in the charging cable,
• e) the evaluation unit is adapted to calculate the charging voltage dropping directly at the transfer point from the first voltage and the second voltage,
• f) the evaluation unit is adapted to calculate a first measured value of the charging voltage from the reference potential and the third voltage, the first measured value not taking into account any line losses in the charging cable,
• g) the evaluation unit is adapted to calculate a second measured value of the charging voltage from the first voltage at the transfer point and the second voltage at the transfer point, the second measured value taking into account the line losses in the charging cable, and
• h) the evaluation unit is adapted to compare the two measured values of the charging voltage with one another and, depending on the comparison, to output an error signal to signal a line break in the charging cable or a poor contact quality between the electric meter and the transfer point.