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Device handbook LINAX PQ3000-PQ5000
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7.6.2 PQ statistic
Power quality (PQ) is assessed by a comparison between the PQ parameters measured by the device
and the limits of a contract agreed upon. The assessment period is usually at least one week to take into
account possible variations between weekdays and weekends.
Via its website the device can perform an assessment of the measured PQ parameters in accordance
with the following standards:
•
EN 50160
(2010)
, low voltage, interconnected systems
•
EN 50160
(2010)
, low voltage, island systems
•
EN 50160
(2010)
, medium voltage, interconnected systems
•
EN 50160
(2010)
, medium voltage, island systems
•
EN 50160
(2010)
, high voltage, interconnected systems
•
EN 50160
(2010)
, high voltage, island systems
•
IEC 61000-2-2
(2002)
, public low voltage systems
•
IEC 61000-2-4
(2002)
, industrial and non-public systems up to 35 kV, class 1
•
IEC 61000-2-4
(2002)
, industrial and non-public systems up to 35 kV, class 2
•
IEC 61000-2-4
(2002)
, industrial and non-public systems up to 35 kV, class 3
•
IEC 61000-2-12
(2003)
, public medium voltage systems
•
User specific limit sets
The assessment of the PQ statistic is shown in the chapter
Data recording | PQ statistic
.
Recorded PQ parameter groups
Measurement
Averaging time
Applied limits
Power frequency
10 s
The applied limits and time conditions of the
preset standards can be seen via the device
website.
They can be displayed via the following menu:
Settings
| Power Quality
| Custom threshold limits
| (Standard)
Within the same menu user data sets with
specific limits and evaluation criteria can be
defined
User specific data sets can also be deleted
again.
Voltage magnitude
10 min.
Flicker P
st
10 min.
Flicker P
lt
2 h
Mains signalling voltage
3 s
Supply voltage unbalance
10 min.
THDS of voltages
10 min.
Voltage harmonics
10 min.
Voltage interharmonics
10 min.
Current magnitude
10 min.
Current unbalance
10 min.
Current harmonics
10 min.
Current interharmonics
10 min.
7.6.3 Provision of PQ data
The device stores PQ related data, such as PQ events or PQ statistic, in the standard format PQDIF in
accordance with IEEE 1159.3. The corresponding files will be created periodically after midnight for the
past day and provided in a hierarchical time structure (year, month, day) for
download
.