Continuous Mean Value Recorder For Frequencies (Cfr) - Siemens SIMEAS R-PMU Manual

7.3.2

Continuous Mean Value Recorder for Frequencies (CFR)

The continuous mean value recorder for frequencies – Continuous Frequency Recorder (CFR)
– is a mean value recorder and stores the arithmetic mean of the frequencies of the fundamental
component for every recording interval. The mean value is always calculated over the complete
recording interval.
Table 7-25
Recording time
Averaging times
Usable DAUs
Recorded values
Note
Only one frequency mean value per measured value group of a DAU is stored if monophase
has been configured.
Table 7-26 provides an exact overview of the values recorded by the DAUs depending on the
input connection.
Table 7-26
Star connection
Delta connection
Monophase
The maximum recording time can be calculated using the following equation:
⋅
R M
t = ------------- 0.607
max
D
where:
t = maximum recording time in days
max
R = averaging time in seconds
M = parameterized memory space in megabytes (MByte)
D = number of active VCDAUs, VDAUs and CDAUs
Digital Fault Recorder, SIMEAS R-PMU, Manual
E50417-H1076-C360-A5, Release 10.2012
CFR – summary of technical data
Continuously
1 s, 2 s, 5 s, 10 s, 30 s, 60 s, 120 s, 240 s, 300 s, 360 s,
480 s, 600 s
VCDAU, VDAU, CDAU
Frequencies
Recorded values of the CFR
VCDAU
f
1
f
2
f
1
f
2
f
1
f
2
1
⋅
---------------- -
MByte
7.3 Continuous Recorder
VDAU CDAU
f
1
f
2
f
1
f
2
f
1
f
2
7
f
1
f
2
f
1
f
2
f
1
f
2
97