Functions
2.15 Fault Locator
SIPROTEC, 7SJ62/64, Manual
C53000-G1140-C207-2, Release date 01.2008
276
2.15.2 Setting Notes
General
The fault location is only enabled if address 180 was set to Enabled during configuration of the function extent.
Under address 181 L-sections FL the number of line section must be selected, which is required for the
accurate description of the line. If the number is set to 2 Sections or 3 Sections, further setting sheets
appear in the Power System Data 2 in DIGSI. Default setting is 1 Section.
Line Data
To calculate the fault distance in kilometers or miles, the device needs the per distance reactance of the line in
Ω/kilometer or Ω/mile. Furthermore, the line length in km or miles, the angle of the line impedance, and resis-
tance and reactance ratios are required. These parameters have already been set in the Power System Data
2 for a maximum of 3 line sections (see Section 2.1.6.2 under„Ground Impedance Ratios“ and „Reactance per
Unit Length“).
Initiation of Measurement
Normally the fault location calculation is started when a directional or non-directional time overcurrent protec-
tion initiates a trip signal (address 8001 START = TRIP). However, it may also be initiated when pickup drops
out (address 8001 START = Pickup), e.g. when another protection element clears the fault. Irrespective of this
fact, calculation of the fault location can be triggered externally via a binary input. (FNo. 1106 „>Start Flt.
Loc“) provided the device has picked up.
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