150
ELSPEC
G
G
4
4
K
K
F
F
i
i
x
x
e
e
d
d
P
P
o
o
w
w
e
e
r
r
Q
Q
u
u
a
a
l
l
i
i
t
t
y
y
A
A
n
n
a
a
l
l
y
y
z
z
e
e
r
r
U
U
S
S
E
E
R
R
&
&
I
I
N
N
S
S
T
T
A
A
L
L
L
L
A
A
T
T
I
I
O
O
N
N
G
G
U
U
I
I
D
D
E
E
Fixed Quality vs. Fixed Ratio
The m ost im portant parameter d efining t he a ctual co mpression r atio, ( which
determines t he am ount o f s torage r equired an d m aximum t ime co ntinuous d ata
can be stored) is a PQZIP Threshold value or Tolerance as it referred on the WEB
page. T he T olerance d efines w hat c hange in an individual h armonic w ould be
defined as significant enough to be stored and reproduced afterwards.
The tolerance value is calculated in percentage to the Nominal Configuration for
the specific channel. It is assumed that changes within 0.1% of nominal would have
no im portance in f urther p ower q uality i nvestigation, a nd t he v alues w ithin t hat
range are averaged to store the representative value only. The basic and factory
default t olerance v alue is n ormally d efined as 0 .1%. H owever, on s ome
sites/networks t hat v alue ca n s till b e co nsidered t oo l ow, f or ex ample, a h ighly
fluctuating l oad or v oltage l ines. I t is m ost l ikely t hat a u ser w ould p refer
increasing a tolerance v alue f or currents o r v oltages o r even both in o rder to
achieve better compression ratios on highly polluted network locations. To set the
tolerance values see PQZIP Recording - Configuration.
CONFIGURING FIXED RATIO
The G4K BLACKBOX provides the possibility of automatic adjustment of the actual
tolerance v alue p resuming a c ompression r atio d efined as am ount o f d ata b eing
stored per m onth. T his o ption is called Fixed Ratio. W hen s elected, t he user is
requested to define the amount of data to be stored per month (Monthly Ratio) in
MB. Usually, slight v oltage spectral changes have higher importance than current
changes. Therefore, the amount of data which could be stored for voltages may be
determined as greater than for currents. The V/I Relation parameter defines the
relationship between the data (a part of the Monthly Ratio) reserved for voltage. If
the voltage portion is larger than that for currents, the system will define a tighter
tolerance for voltages than for currents.
Access G4K PQZIP Configuration via the PQZIP Recording Tab
In the PQZIP Configuration section, go to the PQZIP Mode & from the drop-
down selection select Fixed Ratio:
Define the amount of data stored per month, b y entering the MB Value in
the Monthly Ratio text box
Set the appropriate V/I Relation value with the
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