P1
P3
P4
X
R
LineAngle
ZxFwd
ZxRev
P2
IEC11000313-1-en.vsd
IEC11000313 V2 EN
Figure 41: Proposed four test points for phase-to-earth fault
Where,
ZxFwd
is the forward positive sequence impedance setting for zone x (where, x is 2- 3
depending on the zone selected)
ZxRev
is the reverse positive sequence impedance setting for zone x (where x is 2- 3
depending on the zone selected)
LineAngle
is the Impedance angle for phase-to-phase fault in degrees
Test points X R
P1
ZxFwd
· sin(
LineAngle
)
ZxFwd
· cos(
LineAngle
)
P2 ((
ZxFwd
-
ZxRev
/ 2) · sin(
LineAngle
))
ZxFwd
/ 2 · (1 + cos(
LineAngle
) +
ZxRev
/2
· (1 – cos(
LineAngle
))
P3 ((
ZxFwd
-
ZxRev
/ 2) · sin(
LineAngle
)) -
ZxFwd
/ 2 · (1 – cos(
LineAngle
) +
ZxRev
/
2 · (1 + cos(
LineAngle
))
P4 -
ZxRev
· sin(
LineAngle
) -
ZxRev
· cos(
LineAngle
)
Change the magnitude and angle of phase-to-phase voltage to achieve impedances at
test points P1, P2, P3 and P4. For each test point, observe that the output signals,
START and STZx are activated (where x is 2 or 3 depending on selected zone). After
the operate time delay of the respective zone has elapsed, also the signals TRIP and
TRZx (where x is 2 or 3 depending on selected zone) shall be activated.
Section 12 1MRK502053-UEN B
Testing functionality by secondary injection
144 Generator protection REG670 2.0 IEC
Commissioning manual
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