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U3P
I3P
Impedance
calculation
U_A
U_B
U_C
I_A
I_B
I_C
BLK_TRIP
External
loss
detection
EXT_LOS_DET
TRIP
PICKUP
I1
U1
Impedance
reach
check
t
Timer
BLOCK
BLK_PICKUP
U_AB
U_BC
U_CA
FR_TIMER
GUID-134FE243-96E9-4B5D-BEB2-75DB0AEE5FC5 V1 EN
Figure 346:
Functional module diagram
Impedance calculation
This module calculates the apparent impedance based on the selected voltages and
currents. The
Measurement mode
and
Phase Sel for Z Clc
settings determine which
voltages and currents are to be used. If the
Measurement mode
is set to "1Phase-earth" or
"1Phase-phase", the
Phase Sel for Z Clc
setting is needed for determining which phase or
phase-phase voltages ("A or AB", "B or BC" and "C or CA") and currents should be used
for calculating the impedance.
Table 604:
Voltages and currents used in impedance calculation
Measurement mode
Phase Sel for Z Clc
Voltages and currents
1Phase-earth
A or AB
V_A, I_A
1Phase-earth
B or BC
V_B, I_B
1Phase-earth
C or CA
V_C, I_C
1Phase-phase
A or AB
V_AB, I_A, I_B
1Phase-phase
B or BC
V_BC, I_B, I_C
1Phase-phase
C or CA
V_CA, I_C, I_A
3Phase-earth
N/A
V_A, V_B, V_C, I_A, I_B, I_C
3Phase-phase
N/A
V_AB, V_BC, V_CA, I_A, I_B, I_C
Pos seqn
N/A
{ V_A,V_B,V_C } or { V_AB,V_BC,V_CA } and I_A,
I_B, I_C
If all three phase voltages and phase currents are fed to the protection
relay, the positive-sequence alternative is recommended.
1MAC059074-MB A
Section 4
Protection functions
615 series ANSI
697
Technical Manual
Содержание Relion 615 series
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