GE UR Series L90 Instruction Manual page 245

5 SETTINGS 5.4 SYSTEM SETUP
The Value of the Nominal Frequency of the chassis is instantiated as a DO in LPHD of LD1. The value is named HzNom
and is an Integer Status (INS).
The value of the nominal system frequency is stored within the CID file created by URPC.
The UR also supports the option to apply no filtering to the synchrophasors. If no filtering is applied (PMU Class = None),
according to the standard the ClcMth attribute will be PRES. The semantic of the ClcMth used is not carried in the individual
DO and so it is recommended that one of letters of the prefix on the instantiated LNs be set to "P" or "M" accordingly in
order to differentiate. For version 7.0 only FCDA data is supported. The Implementation by Model Number table, see
above, describes the maximum size of each PMU data set for version 7.0 using FCDA data (non-structured data).
EXAMPLE: PROTECTION SYNCHROPHASORS DATA SET WITH REPORTING RATE 60 FRAMES/SECOND
This example gives the protection synchrophasors data set with a reporting rate of 60 frames per second (P60MMXU1).
See figure above, Logical Nodes Supported in Each Logical Device. This data or list of items, see figure below, is not yet
exposed to the client but available to be mapped by the user into a selected aggregator or aggregators dataset. The logical
device name – LDName - of each PMU LD will be a 64 character user setting. The C37.118 STN and IDCode is to be
mapped as a concatenated value in the (d)escription field of LPL CDC of the NamPlt DO in LLN0. The mapping is imple-
mented as STN-IDCode(text string).
From each PMU the user selects the phasor information of interest that is mapped into the selected aggregator datset(s).
For version 7.0 only FCDA data is supported.
5
Figure 5–40: DATA SET CREATED FROM USER SELECTED INTERNAL ITEMS
GE Multilin L90 Line Current Differential System 5-107