Power Quality Standards
:
Considering that the electrical
energy produced can have an effect
on the voltage, the majority of the
definitions on the power quality
concept are on voltage. Since the
current drawn from the system will
depend on the load, the current
waveform cannot be predicted. The
main criterion is the voltage,
although large changes in current,
as in short-circuit events, affect
the voltage. For this reason, the
standards and definitions are based
on voltage waveform and effective
value.
As power quality is related to both
producer and consumer, quality
related standards can be divided
into two groups accordingly.
Standards in the first group IEC
61000-2-5: 1995 IEC 61000-2-5: 1995:
'Electromagnetic Compatibility
(EMC), Part 2: Environment, section
5': Classifications of
Electromagnetic
EnvironmentsDescriptions of the
Environments and EN 50160: 2000 BS
EN 50160: 2000: 'Voltage
Characteristics of Electricity
Distribution', BRITISH STANDARD
INSTITUTION, 2000. Gives the
compatibility limits that a device
or product must have.
The requirements of the low and
medium voltage distribution network
In the EN 50160: 2000 standard, the
limits of the concepts such as
voltage, frequency, amplitude, cut,
unbalance are stated. The EN50160 is
not an EMC standard but defines the
desired voltage quality in Europe.
When the standard is examined, it is
seen that generally the events are
defined, their reasons are shown but
the exact limits are not drawn.
The second group is an example of
the IEEE 1159: 2009 standard. In
this standard, distortions that may
occur at a point defined as a common
interaction point on the network are
limited and power quality events are
defined according to their duration
and amplitudes.
|