phase coordinates approach [3, 4] for describing parallel lines, representing SCs&MOVs and a fault is utilized
two characteristic fault spots (Figures 1, 2) are considered and thus two subroutines are used in the algorithms:
Subroutine 1 (Fig. 1) for locating faults behind the
SCs&MOVs with additional discrimination of the faults
overreaching the line length (denoted in Fig. 1 as F1a);
the sought fault distance ( 1 x [pu]) satisfies: x p 1 > ,
Subroutine 2 (Fig. 2) for locating faults in front of the
SCs&MOVs; the sought fault distance ( 2 x [pu])
satisfies: x p 2 < .
separate selection procedure is applied to obtain the correct estimate out of the two conditional solutions delivered by the subroutines 1, 2,
shunt capacitances of parallel lines are neglected, however, to improve fault location accuracy in case of long lines the capacitances may be accounted for,
the recorded voltage and current data cover the time
window before firing the air-gaps, which are in parallel
with MOVs (note that air-gaps are not shown in
Figures 1, 2),
• fault detection and classification is provided by a protective relay or by separate procedures of the locator.
phase coordinates approach [3, 4] for describing parallel lines, representing SCs&MOVs and a fault is utilized
two characteristic fault spots (Figures 1, 2) are considered and thus two subroutines are used in the algorithms:
Subroutine 1 (Fig. 1) for locating faults behind the
SCs&MOVs with additional discrimination of the faults
overreaching the line length (denoted in Fig. 1 as F1a);
the sought fault distance ( 1 x [pu]) satisfies: x p 1 > ,
Subroutine 2 (Fig. 2) for locating faults in front of the
SCs&MOVs; the sought fault distance ( 2 x [pu])
satisfies: x p 2 < .
separate selection procedure is applied to obtain the correct estimate out of the two conditional solutions delivered by the subroutines 1, 2,
shunt capacitances of parallel lines are neglected, however, to improve fault location accuracy in case of long lines the capacitances may be accounted for,
the recorded voltage and current data cover the time
window before firing the air-gaps, which are in parallel
with MOVs (note that air-gaps are not shown in
Figures 1, 2),
• fault detection and classification is provided by a protective relay or by separate procedures of the locator.
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