Fault Report Settings - GE D90 Plus Instruction Manual

CHAPTER 10: DIGITAL FAULT RECORDER

Fault report settings

PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
Inserting the I and I equations into the V
A B
resistance.
Assuming the fault components of the currents I
that the fault resistance, as impedance, does not have any imaginary part gives the
following equation:
where the Im( ) function represents the imaginary part of a complex number. Solving the
equation for the unknown m creates the following fault location algorithm:
where * denotes the complex conjugate and I
Depending on the fault type, appropriate voltage and current signals are selected from the
phase quantities before applying the two equations above (the superscripts denote
phases, the subscripts denote stations). For AG, BG, and CG faults, we have
For AB, ABG, BC, BCG, CA, and CAG faults, we have
In the above equations, K
0
faults, all three AB, BC, and CA loops are analyzed and the final result is selected based
upon consistency of the results.
The fault location element calculates the distance to the fault (with m in miles or
kilometers) and the phases involved in the fault.
Select the Settings > DFR > Fault Report menu to open the fault report configuration
window.
equation and solving for R
A
and I
A(F)
= I
A(F) A
represents the zero-sequence compensation factor. For ABC
FAULT REPORT
yields the fault
F
are in phase, and observing
B(F)
– I .
A(pre)
Eq. 49
Eq. 50
Eq. 51
Eq. 52
Eq. 53
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