Section 9
1MAC050144-MB C
Recording functions
612
615 series ANSI
Technical Manual
R1
is positive sequence line resistance in ohm/ (miles or kms) and is provided as a setting
X1
is positive sequence line reactance in ohm/ (miles or kms) and is provided as a setting
R0
is zero sequence line resistance in ohm/ (miles or kms) and is provided as a setting
X0
is zero sequence line reactance in ohm/ (miles or kms) and is provided as a setting
Line Length
is the length of the line in the units of kilometers (Km) or miles and is provided
as a setting.
If
R1
,
X1
,
R0
,
X0
are given in ohm/mile then the length of the line
Line Length
should be
given in the unit of miles
If
R1
,
X1
,
R0
,
X0
are given in ohm/Km then the length of the line
Line Length
should be
given in the unit of Km’s.
Table 516 describes what will be the voltage phasor and current phasor under different
fault types.
Table 516: Relay voltage and current phasor identification
* indicates the respective current is ground compensated
Fault location
This module calculates the distance to fault and fault resistance from the voltage phasor
and current phasor selected based on type of the fault (see Table 516).
The algorithm uses the fundamental frequency phasor voltages and currents measured at
the relay terminal before and during the fault.
The algorithm basically is an iterative technique, performs a comparison of the pre fault
load impedance and apparent impedance during the fault, to estimate the distance to fault.
Estimated values of fault resistance, pre fault load impedance and line impedance are then
modified using the correction factors. And the corrected values are used to estimate the
final FLT_DIST and FLT_R.
During the auto-re-closure sequences the fault location is done with initial fault conditions.
FLTLOOP
Current phasor
Voltage phasor
AG Fault
I_A*
V_A
BG Fault
I_B*
V_B
CG Fault
I_C*
V_C
ABG Fault
(I_A - I_B)
(V_A - V_B)
BCG Fault
(I_B - I_C)
(V_B - V_C)
CAG Fault
(I_C - I_A)
(V_C - V_A)
ABCG Fault
I_A
V_A
AB Fault
(I_A - I_B)
(V_A - V_B)
BC Fault
(I_B - I_C)
(V_B - V_C)
CA Fault
(I_C - I_A)
(V_C - V_A)
ABC Fault
I_A
V_A
Содержание 615 Series ANSI
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Страница 389: ...Section 4 1MAC050144 MB C Protection functions 382 615 series ANSI Technical Manual ...
Страница 485: ...Section 6 1MAC050144 MB C Supervision functions 478 615 series ANSI Technical Manual ...
Страница 635: ...Section 10 1MAC050144 MB C Other functions 628 615 series ANSI Technical Manual ...
Страница 707: ...Section 15 1MAC050144 MB C Applicable standards and regulations 700 615 series ANSI Technical Manual ...
Страница 711: ...Section 16 1MAC050144 MB C Glossary 704 615 series ANSI Technical Manual ...
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