Demand Measurement Setup; Description; Setting Notes; Settings - Siemens SIPROTEC 7SD80 Manual

Functions
2.17 Additional Functions
2.17.7

Demand Measurement Setup

The long-term averages are calculated and output by the 7SD80.

2.17.7.1 Description

Long-Term Averages
The long-term averages of the three phase currents I
currents, and the real power P, reactive power Q, and apparent power S are calculated within a set period of
time and indicated in primary values.
For the long-term averages mentioned above, the length of the time window for averaging and the frequency
with which it is updated can be set.

2.17.7.2 Setting Notes

Averaging
The selection of the time period for measured value averaging is set using the parameter 2801 DMD Interval
in the corresponding setting group from A to D at MEASUREMENT. The first number specifies the averaging
time window in minutes while the second number gives the frequency of updates within the time window. 15
Min., 3 Subs, for example, means: Averaging over time for all measured values that arrive within a time
window of 15 minutes. The output is updated every 15/3 = 5 minutes.
Address 2802 DMD Sync.Time allows you to specify whether the time period of averaging selected at address
2801 starts on the hour (On The Hour) or whether it is synchronized with any of the other times (15 After
Hour, 30 After Hour or 45 After Hour).
If the settings for averaging are changed, the measured values stored in the buffer are deleted, and new results
for the average calculation are only available after the set time period has passed.

2.17.7.3 Settings

Addr. Parameter
2801 DMD Interval
2802 DMD Sync.Time
210
, the positive sequence components I
x
Setting Options
15 Min., 1 Sub
15 Min., 3 Subs
15 Min.,15 Subs
30 Min., 1 Sub
60 Min., 1 Sub
On The Hour
15 After Hour
30 After Hour
45 After Hour
Default Setting
60 Min., 1 Sub Demand Calculation Intervals
On The Hour Demand Synchronization Time
E50417-G1140-C474-A1, Release date 09.2011
for the three phase
1
Comments
SIPROTEC, 7SD80, Manual