Setting Notes - Siemens SIPROTEC 7SJ62 Manual

Functions
2.15 Fault Locator
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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SIPROTEC, 7SJ62/64, Manual
C53000-G1140-C207-2, Release date 01.2008