Configuration > Data Storage > Event Storage
Parameter Range Default Setting
Clear events Yes, no
Fault Locator
The single end type fault locator estimate the fault position using analogue information measured by the relay
at 1 end of the protected circuit during the short duration of the fault.
Following relay operation due to a system fault, the fault waveform record is automatically evaluated to estab-
lish the fault type in terms of the phase(s) affected and the appropriate currents and voltages are used to
calculate the fault impedance. The relay compares this information to a line model based on characteristic
impedance parameters which are input to the relay as settings and provides an output estimate of the fault
location.
Fault Location is reported for faults calculated in a zone which extends to 200 % of the forward line impe-
dance and 10 % in the reverse direction. High resistance fault results where fault resistance is calculated as up
to 20 times the line impedance are reported. For faults beyond these limits, the message No Location is
reported.
Fault Location estimation is initiated by operation of a Trip Contact. Some protection elements may be
configured to provide tripping for system conditions where fault location is not applicable. The initiation of the
Fault Locator can be inhibited by user settings.
The Fault Locator result data is available in the Fault Data records and can be viewed at the relay fascia
and in the Reydisp PC tool.
The functionality is configured in the Configuration > Data Storage > Fault Locator menu.
Fault Locator Settings
Parameter: Fault Locator > Line Angle
•
Default Setting: 75°
The line impedance angle when plotted in the R-X plane, this is used to enable the distance to fault to be
calculated.
Parameter: Fault Locator > EF Comp Z
0
/Z
1
Ratio
•
Default Setting: 2.5
The earth fault return impedance ratio of zero to positive sequence impedance magnitudes.
Parameter: Fault Locator > EF Comp Z
0
Angle
•
Default Setting: 75°
The earth fault return impedance characteristic phase angle of the zero sequence impedance. The charac-
teristic angle of the zero sequence impedance is often significantly different to that of the positive
sequence impedance.
Parameter: Fault Locator > Z+ Impedance
•
Default Setting: 10 Ω
The protected line Positive Sequence Impedance is used to enable the distance to fault to be
calculated.
3.6.6
Device Functionality
3.6 Data Storage
Reyrolle 7SR5, Overcurrent Protection Device, Device Manual 121
C53000-G7040-C014-1, Edition 11.2019
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