Determination of harmonic pollution on an electrical distribution network

A meter configured for detection of a harmonic pollution within an electricity distribution network transmitting a three-phase current, the meter comprising:

• a voltage meter for measuring voltages and magnitudes of the current for each of the phases, of the three-phase current, at a metering point of the network;
• a first device configured to calculate a first impedance corresponding to the basic frequency of the current;
• a second device configured to calculate at least a second impedance corresponding to a harmonic frequency of the current,
• the first impedance and the at least second impedance being calculated by transforming the voltages and magnitudes in a two-dimensional transform, defined according to an angle based on the frequency in order to provide a system of 2 vectors of 3 quantities, ud, uq, uo and id, iq, io, respectively, and
• then, by applying, to determine the first impedance and the at least second impedance, the expressions:
• Z
• r
• =
• u
• d
• ×
• i
• d
• +
• u
• q
• ×
• i
• q
• i
• d
• ×
• i
• d
• +
• i
• q
• ×
• i
• q
• ,
• to determine a real part for the first impedance and the at least second impedance, respectively, and
• Z
• i
• =
• u
• q
• ×
• i
• d
• +
• u
• d
• ×
• i
• q
• i
• d
• ×
• i
• d
• +
• i
• q
• ×
• i
• q
• ,
• to determine an imaginary part for the first impedance and the at least second impedance, respectively;
• and wherein
• the meter is configured to determine a difference between the first impedance and the at least second impedance;
• and
• the meter is configured to detect harmonic pollution based on the difference between the first impedance and the at least second impedance.