ABB M4M 30 - Harmonics

M4M 30 NETWORK ANALYZER USER MANUAL
79
10.3.Harmonics
Harmonics are integer multiples of the fundamental frequency of the power system. Harmonics are used
to identify if the supplied system power meets required power quality standards, or if non-linear loads
are affecting your power system.
Power system harmonics can cause current flow on the neutral conductor, and damage to equipment
such as increased heating in electric motors.
Measurement of the harmonics is done sequentially, one at a time, over a number of line cycles. Each
harmonics is calculated according to:
I
n
/I
f
·100%
where I
f
is the fundamental current and I
n
is the current for harmonics with number n.
M4M 30 provides harmonic distortion metering up to the 40th harmonic, which are available on
communication protocol.
On the HMI in this section it is possible to visualize the first 15 harmonics as graphs, where the vertical
axis of the harmonics graph indicates the harmonic’s magnitude as a percentage of the fundamental
harmonic, and is scaled based on the largest harmonic displayed.
See section “7.9.Other settings” for the configuration of harmonics warning level.
→ → Harmonics
Harmonics Graphs Description
L-N Voltage
Line-to-neutral voltage harmonics graphs, including fundamental
harmonic and harmonics from 2nd to 15th.
L-L Voltage
Line-to-line voltage harmonics graphs, including fundamental
harmonic and harmonics from 2nd to 15th.
Current
Current harmonics graphs, including fundamental harmonic and
harmonics from 2nd to 15th.