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5.4 SYSTEM SETUP
b) BASIC CONFIGURATION
PATH: SETTINGS
SYSTEM SETUP
PMU 1 BASIC
CONFIGURATION
This section contains basic phasor measurement unit (PMU) data, such as functions, source settings, and names.
•
PMU 1 FUNCTION: This setting enables the PMU 1 functionality. Any associated functions (such as the recorder or
triggering comparators) will not function if this setting is "Disabled". Use the command frame to force the communica-
tion portion of the feature to start/stop transmission of data. When the transmission is turned off, the PMU is fully oper-
ational in terms of calculating and recording the phasors.
•
PMU 1 IDCODE: This setting assigns a numerical ID to the PMU. It corresponds to the IDCODE field of the data, con-
figuration, header, and command frames of the IEEE C37.118 protocol. The PMU uses this value when sending data,
configuration, and header frames and responds to this value when receiving the command frame.
5
•
PMU 1 STN: This setting assigns an alphanumeric ID to the PMU station. It corresponds to the STN field of the config-
uration frame of the IEEE C37.118 protocol. This value is a 16-character ASCII string as per the IEEE C37.118 stan-
dard.
•
PMU 1 SIGNAL SOURCE: This setting specifies one of the available T60 signal sources for processing in the PMU.
Note that any combination of voltages and currents can be configured as a source. The current channels could be con-
figured as sums of physically connected currents. This facilitates PMU applications in breaker-and-a-half, ring-bus, and
similar arrangements. The PMU feature calculates voltage phasors for actual voltage (A, B, C, and auxiliary) and cur-
rent (A, B, C, and ground) channels of the source, as well as symmetrical components (0, 1, and 2) of both voltages
and currents. When configuring communication and recording features of the PMU, the user could select – from the
above superset – the content to be sent out or recorded.
•
PMU 1 POST-FILTER: This setting specifies amount of post-filtering applied to raw synchrophasor measurements.
The raw measurements are produced at the rate of nominal system frequency using one-cycle data windows. This set-
ting is provided to deal with interfering frequencies and to balance speed and accuracy of synchrophasor measure-
ments for different applications. The following filtering choices are available:
Table 5–9: POST-FILTER CHOICES
SELECTION
None
Symm-3-point
Symm-5-point
Symm-7-point
Class M
Class P
This setting applies to all channels of the PMU. It is effectively for recording and transmission on all ports configured to
use data of this PMU.
Class M filtering functionality is derived from the draft IEEE C37.118 specification and may be subject to
change when the standard is published.
NOTE
5-106
PHASOR...
PMU 1
FUNCTION: Disabled
PMU 1 IDCODE: 1
MESSAGE
PMU 1 STN:
MESSAGE
GE-UR-PMU
PMU 1 SIGNAL SOURCE:
MESSAGE
SRC 1
PMU 1 POST-FILTER:
MESSAGE
Symm-3-point
CHARACTERISTIC OF THE FILTER
No post-filtering
Symmetrical 3-point filter (1 historical point, 1 present point, 1 future point)
Symmetrical 5-point filter (2 historical points, 1 present point, 2 future points)
Symmetrical 7-point filter (3 historical points, 1 present point, 3 future points)
Symmetrical FIR filter on samples
21-tap symmetrical FIR filter on current input channels
T60 Transformer Protection System
PHASOR MEASUREMENT UNIT 1
Range: Enabled, Disabled
Range: 1 to 65534 in steps of 1
Range: 16 alphanumeric characters
Range: SRC 1, SRC 2, SRC 3, SRC 4, SRC 5, SRC 6
Range: None, Symm-3-point, Symm-5-point,
Symm-7-point, Class M, Class P
5 SETTINGS
PMU 1 BASIC CONFIGURATION 1
GE Multilin
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