19
The following electrical energy values are accumulated and stored in the meter memory:
•
Integration period energy;
•
Daily energy
– by all tariffs and total.
•
Monthly energy
– by all tariffs and total.
•
Total energy of each tariff and sum of all tariffs.
3.2. Demand registration
The meter calculates average power over integration period and based on the calculated data,
determines and registers maximum demands with their respective timestamps.
The EPQS meter registers values of maximum demand of active (+P, -P), reactive (Q1, Q2, Q3, Q4),
and apparent (+S, -S) power of each demand on daily and monthly basis. Monthly maximum demand
values are stored in monthly profiles and daily maximum demand - in daily profiles (see above).
The meter collects load profiles of active +A and -A; reactive R1, R2, R3, R4; apparent +W, -W
energy.
The values of average power of integration period are stored into appropriate load profile registers of
FLASH memory after the end of an integration period.
The meter memory can hold at least 8190 of values of average power of integration period for each
kind of energy. The duration of load profile data storage in the meter memory depends on the duration
of integration period. The duration of integration period can be set from 30 s to 3600 s at 1 s step. The
integration period is set upon the condition that the time interval of 1 hour can be divided into a whole
number of integration periods.
2
5
17
28
85
170
341
0
50
100
150
200
250
300
350
400
0,5
1
3
5
15
30
60
Integration period, min
D
a
y
s
Picture 3-2. Load profile length dependency on integration period
3.3. Registration of Instantaneous Values
For registration of instantaneous values, the EPQS meter provides 16 freely programmed channels.
Table 3-5 lists values that can be registered by those freely programmed channels.
A freely programmed channel is an area in the meter FLASH memory.
A time interval between the two successive moments of registration of chosen value is called query
period. In the case of EPQS meter, all freely programmed channels have a common query period that
Содержание EPQS
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