Continuous Mean Value Recorder For Active And Reactive Power (Cqr) - Siemens SIMEAS R-PMU Manual

7.3.4 Continuous Mean Value Recorder for Active and Reactive Power
(CQR)
The continuous mean value recorder for active and reactive powers – Continuous Power
Recorder (CQR) – stores the arithmetic mean of the active and reactive powers calculated from
the fundamental components for every recording interval. The mean value is always calculated
over the complete averaging time.
Table 7-29
Recording time
Averaging intervals
Usable DAUs
Recorded values
Table 7-30 provides an exact overview of the values recorded by the DAUs depending on the
input connection.
Table 7-30
Star connection
Delta connection
Monophase
* Coupled CDAU: The current inputs of the CDAU are coupled to a voltage group, e. g., a VDAU or
VCDAU, for power measurement. For detailed information, please refer to the "Parameterization"
chapter.
Note
For power measurement with a CDAU, all channels 1 to 8 are coupled with the 1st voltage
group (channels 1 to 4) of a VCDAU or VDAU. Since the CDAU only measures phase-to-
phase currents, the connection type of the coupled voltage group that has been
parameterized for the VDAU or VCDAU is used for calculating the powers. If star or delta
connection have been configured, the total powers of the first three channels of each group
are determined.
Digital Fault Recorder, SIMEAS R-PMU, Manual
E50417-H1076-C360-A5, Release 10.2012
CQR – 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, coupled CDAU
Active powers, reactive powers
Recorded values of the CQR
VCDAU
P , Q , P
Σ Σ
P , Q , P
Σ Σ
P , P , P
1 2
Q , Q , Q
1 2
, Q
4 4
, Q
4 4
, P
3 4
, Q
3 4
7.3 Continuous Recorder
Coupled CDAU*
P , Q , P , Q
Σ1 Σ1
4 4
P , Q , P , Q
Σ2 Σ2
8 8
P , Q , P , Q
Σ1 Σ1
4 4
P , Q , P , Q
Σ2 Σ2
8 8
P , P , P , P
1 2 3 4
Q , Q , Q , Q
1 2 3 4
P , P , P , P
5 6 7 8
Q , Q , Q , Q
5 6 7 8
99
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