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