Siemens SIMEAS R-PMU Manual page 54

7
7.1 Phasor Measurement Unit (PMU)
Reporting rate
The parameterizable reporting rate of the SIMEAS R-PMU defines the number of telegrams that
are created and transferred to the PDC per second. It can be set depending on the nominal
frequency and equally applies to all data acquisition units (DAU) in the SIMEAS R-PMU. When
selecting the reporting rate, the available bandwidth of the data connection to the PDC should
always be considered (see tables 7-4 to 7-8).
Table 7-1
Name
Nominal frequency
Reporting rate
in telegrams/s
Recorded values
* The reporting rates of 50 or 60 telegrams/second are not prescribed by the standard but are supported
by the SIMEAS R-PMU.
Time synchronization
The synchronisation of the SIMEAS R-PMU device is very important if phasors of different
locations are to be compared to each other. To be able to create the phasors at absolute instants
of time, a highly precise GPS time signal is used for synchronizing the SIMEAS R-PMU.
Behaviour on error:
If the external timer malfunctions, the second pulse will be generated by the central processing
unit of the SIMEAS R-PMU. PMU data will be marked as invalid (Flag Data valid = 1). Only after
the external synchronization signal is provided and adjusted again will the PMU data be marked
as valid again (Data valid = 0). The flag PMU sync displays the state of the GPS time signal. "1"
means no valid signal available, and "0" valid signal available. See also "Time Synchronization"
in chapter 8 of this manual.
Note
Every component that is connected between the timer and the SIMEAS R slightly delays the
synchronization signal. This delay time must be compensated for by the SIMEAS R-PMU, in
order not to exceed the maximum total vector error (TVE) of the PMU. Refer also to chapter 8.3.
Note
When Sync-Box 7KE6000-8HAx is used as a timer, the PMU data is marked as invalid due to
low precision. See also chapter 8.3.
54
PMU - Technical Data
f = 50 Hz
n
10 25
VDAU, VCDAU, CDAU: phasors V, I or positive-sequence phasors,
DDAU:
BDAU:
Description
f
n
50 * 10 12 15
binary data
process values, binary data
binary data
Digital Fault Recorder, SIMEAS R-PMU, Manual
E50417-H1076-C360-A5, Release 10.2012
= 60 Hz
20 30 60 *