GE L30 Instruction Manual page 381
Line current differential system
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Also See for L30:
- Instruction manual (698 pages) ,
- Communications manual (532 pages) ,
- Instruction manual (630 pages)
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CHAPTER 5: SETTINGS
Precise time input to the relay from the international time standard, via either IRIG-B or PTP, is vital for correct
synchrophasor measurement and reporting. For IRIG-B, a DC level shift IRIG-B receiver must be used for the PMU to
output proper synchrophasor values.
Depending on the applied filter, the synchrophasors that are produced by PMUs are classified as either P (protection) or M
(Measurement) class synchrophasors. Synchrophasors available within the UR that have no filtering applied are classified
as NONE, which within the standard is classified as PRES OR UNKNOWN under the Calculation Method - ClcMth. Each
Logical Device PMU supports one MxxMMXU, MxxMSQI, PxxxMMXU , PxxxMSQI, NxxMMXU, and one NxxMSQI logical node.
The following is a summary of LNs that are in each Logical Device (LD2 through LD7):
•
PxxxMMXU1 ClcMth = P-Class (Note Vaux is mapped to Vneut of MMXU)
•
PxxxMSQI1 ClcMth = P-CLASS
•
MxxMMXU1 ClcMth = M-Class (Note Vaux is mapped to Vneut of MMXU)
•
MxxMSQI1 ClcMth = M-CLASS
•
NxxMMXU1 ClcMth = M-Class (Note Vaux is mapped to Vneut of MMXU)
•
NxxMSQI1 ClcMth = M-CLASS
L30 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
Figure 5-83: N60 example for four logical device PMUs
Figure 5-84: Logical nodes supported in each logical device
SYSTEM SETUP
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