Siemens SIMEAS R-PMU, Manual, Page: 58 / 296

7
7.1 Phasor Measurement Unit (PMU)
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Digital Fault Recorder, SIMEAS R-PMU, Manual
E50417-H1076-C360-A5, Release 10.2012
7.1.2 Data Communication of the SIMEAS R-PMU
Figure 7-4 PDC Client and PMU Server (sample configuration)
The PMU communication is a client/server communication where the PDC (Phasor Data
Concentrator) is the client and the SIMEAS R-PMU is the server. The PDC switches ON the
measured data transmission of the SIMEAS R-PMU, requests the configuration and receives the
measured data. Only one PDC can connect to the SIMEAS R-PMU simultaneously
.
A PMU ID must be assigned for each SIMEAS R-PMU. The assigned PMU ID is valid for the
central processing unit of the SIMEAS R-PMU. Since every DAU is regarded as an individual
Phasor Measurement Unit that is subordinate to the central processing unit, the DAUs are
automatically assigned the sequence numbers of the central processing unit as a PMU ID. See
example in figure 7-4: The central processing unit of the SIMEAS R-PMU at bottom left is
assigned the PMU ID 1 and its DAUs the PMU IDs 2 to 5.
The PMU data can be transferred to the PDC either using LAN (UDP, TCP) or RS232 (null
modem, modem). The parameterization is described in chapter 12.14.2.
PMU data communication via LAN (Local Area Network)
Ideally, the SIMEAS R-PMU is connected to the Phasor Data Concentrator via LAN (UDP or
TCP) because of the high data volumes. This is the only case in which the required data transfer
rates for all parameterizable reporting rates are supported. Furthermore, only the LAN interface
supports the simultaneous data transmission with a PDC and OSCOP P.
Phasor Data Concentrator – PDC Client
LA
N
Mod
em
RS
23
2
PMU 1 – ZE 32/64
Server 1
PMU-ID: 1 to 5
PMU 2 – ZE 32/64
Server 2
PMU-ID: 6 to 10
PMU 3 – ZE 8/16
Server 3
PMU-ID: 11 and 12
GPS
GPS
GPS
3
3
3
Note
Depending on the number of DAUs in the PMU, a range between two and five PMU IDs must be
reserved.