These impedance values can be utilized as such or they can be further processed in system
level fault location applications, such as distribution management system (DMS).
Fault loops “AG Fault” or “BG Fault” or “CG Fault”
Fault loops “AG Fault”, “BG Fault” or “CG Fault” are used for single-phase-to-ground
faults. When the individual ground faults are located at different feeders, they are also
applied in the case of two-phase-to-ground fault. In this case, the phase-to-ground loop
(either “AG Fault” or “BG Fault” or “CG Fault”) corresponding to the faulty phase at the
protected feeder, is used for calculation.
shows the phase-to-ground fault loop
model. The following impedances are measured and stored in the recorded data of 21FL.
Flt point resistance
R
fault
=
GUID-2503378E-4AC5-4E9F-9D77-2E7C71592C37 V3 EN
(Equation 138)
Flt loop resistance
R
R
R
N
fault
=
+
+
1
GUID-4DF67AFC-67E4-4BCB-958E-CC9E4872E252 V3 EN
(Equation 139)
Flt loop reactance
X
X
N
=
+
1
GUID-B4E21936-B993-4A8A-9C4A-7425F8AC4670 V3 EN
(Equation 140)
Flt phase reactance
X
=
1
GUID-56EC16DD-7F6A-4DE5-935E-4302196DE21A V3 EN
(Equation 141)
R
1
Estimated positive-sequence resistance from the substation to the fault location
X
1
Estimated positive-sequence reactance from the substation to the fault location
R
0
Estimated zero-sequence resistance from the substation to the fault location
X
0
Estimated zero-sequence reactance from the substation to the fault location
R
N
Estimated the ground return path resistance (= (R0 – R1)/3) from the substation to the
fault location
X
N
Estimated is the ground return path reactance (= (X0 – X1)/3) from the substation to the
fault
R
fault
Estimated fault resistance at the fault location
The recorded data Flt phase reactance provides the estimated positive-sequence reactance
from the substation to the fault location.
1MAC059074-MB A
Section 5
Protection related functions
615 series ANSI
807
Technical Manual
Содержание Relion 615 series
Страница 1: ... RELION PROTECTION AND CONTROL 615 series ANSI Technical Manual ...
Страница 2: ......
Страница 39: ...Section 17 Glossary 1181 Table of contents 615 series ANSI 33 Technical Manual ...
Страница 40: ...34 ...
Страница 64: ...58 ...
Страница 210: ...3 19 4 Settings Section 3 1MAC059074 MB A Basic functions 204 615 series ANSI Technical Manual ...
Страница 216: ...210 ...
Страница 884: ...878 ...
Страница 1038: ...1032 ...
Страница 1136: ...1130 ...
Страница 1172: ...1166 ...
Страница 1180: ...1174 ...
Страница 1186: ...1180 ...
Страница 1192: ...1186 ...
Страница 1193: ...1187 ...
Страница 1194: ......
Страница 1195: ......