Sequence of Events Reports and Fault Recording
GARD 8000 Distance Relay
RFL Electronics Inc.
10.2.8
DOWNLOAD OF COMTRADE OSCILLOGRAPHIC RECORD
All DFR records are stored directly in COMTRADE format. To view a DFR records, it needs to be
downloaded to a computer and the files opened with a viewer. The viewer can be any standard
COMTRADE reader or the ZIVerCOM Analyzer provided with the GARD 8000 System.
To download a DFR file ‘Retrieve Oscillography File from Distance Relay’ is selected from the
Distance Relay Status screen. This opens a screen where the record to be downloaded and the format is
selected. The data file can be either binary (smaller file) or ASCII.
10.3
FAULT LOCATOR
The GARD 8000 distance protection module includes a fault locator. The algorithm compensates for
load flow and uses an innovative steady state algorithm for very accurate distance to fault indication.
10.3.1
SETTINGS FOR THE FAULT LOCATOR
•
Line Impedance, Local Source Impedance The following line parameters are used by the fault
locator algorithm
o
Positive sequence magnitude
o
Positive sequence angle
o
Zero sequence angle and K0 factor
All values are secondary ohms.
•
Line Length. The length is a unit-less value and corresponds to the next setting length units.
•
Line length units. Kilometers or miles.
•
Fault locator units. This parameter can be set to ‘length units’ and will then display the
measured km or miles. If set to % it will display the distance to the fault as a percentage of the
line length.
•
Indication zone. If set to ‘In’ the fault locator will display the distance for faults on the
protected line only. When set to ‘In & Out’ it will display distance for all faults detected within
any distance zone.
March 1, 2009
10-13
973.334.3100
