PM 1001484 000 06
Device handbook SINEAX DM5000
70/87
A4 Mean values and trend
Measured quantity
P
rese
n
t
T
re
n
d
m
ax
m
in
H
is
to
ry
Active power I+IV
10s...60min.
1)
●
●
●
●
5
Active power II+III
10s...60min.
1)
●
●
●
●
5
Reactive power I+II
10s...60min.
1)
●
●
●
●
5
Reactive power III+IV
10s...60min.
1)
●
●
●
●
5
Apparent power
10s...60min.
1)
●
●
●
●
5
Mean value quantity 1
10s...60min.
2)
●
●
●
●
1
….
Mean value quantity 12
10s...60min.
2)
●
●
●
●
1
1)
Interval time t1
2)
Interval time t2
The device calculates automatically the mean values of all system power quantities. In addition up to 12
further mean value quantities can be freely selected.
Calculating the mean-values
The mean value calculation is performed via integration of the measured instantaneous values over a
configurable averaging interval. The interval time may be selected in the range from 10 seconds up to one
hour. Possible interim values are set the way that a multiple of it is equal to a minute or an hour. Mean
values of power quantities (interval time t1) and free quantities (interval time t2) may have different
averaging intervals.
Synchronization
For the synchronization of the averaging intervals the internal clock or an external signal via digital input
may be used. In case of an external synchronization the interval should be within the given range of one
second up to one hour. The synchronization is important for making e.g. the mean value of power
quantities on generating and demand side comparable.
Trend
The estimated final value (trend) of mean values is determined by weighted addition of measurements of
the past and the present interval. It serves for early detection of a possible exceeding of a given maximum
value. This can then be avoided, e.g. by switching off an active load.
History
For mean values of system powers the last 5 interval values may be displayed on the device or read via
interface. For configurable quantities the value of the last interval is provided via communication interface.
Bimetal current
This measured quantity serves for measuring the long-term effect of the current, e.g. for monitoring the
warming of a current-carrying line. To do so, an exponential function is used, similar to the charging curve
of a capacitor. The response time of the bimetal function can be freely selected, but normally it
corresponds to the interval for determining the power mean-values.
Measured quantity
P
resen
t
m
ax
min
1L
2L
3Lb
3Lb.
P
3Lu
3Lu.
A
4Lb
4Lu.
O
4Lu
Bimetal current IB,
1...60min.
3)
● ●
√
√ √
√
Bimetal current IB1,
1...60min.
3)
● ●
√
√ √
√ √
Bimetal current IB2,
1...60min.
3)
● ●
√
√ √
√ √
Bimetal current IB3,
1...60min.
3)
● ●
√ √
√ √
3)
Interval time t3
