Table 15:
Test points for phase-to-earth loop of circular characteristic in solidly earthed system
Test point
R
X
Comment
P1
Z1CircleStart
∗
cos(
LineAng
)
∗
(1+
REOverRLStart
)
Z1CircleStart
∗
sin(
LineAng
)
∗
(1+
XEOverXLStart
)
P2
0.8
∗
Z1CircleStart
∗
cos(
ArgLd
)
∗
cos
(
LineAng
)
(1+
REOverRLStart
)
0.8
∗
Z1CircleStart
∗
sin(
ArgLd
)
∗
sin (
LineAng
)
(1+
XEOverXLStart
)
If 2I0 <
I0MinOp
P3
RLd
0
If 2I0 <
I0MinOp
P4
-
Z1CircleStart
∗
cos(
LineAng
)
∗
(1+
REOverRLStart
)
-
Z1CircleStart
∗
sin(
LineAng
)
∗
(1+
XEOverXLStart
)
P5
-0.8
∗
Z1CircleStart
∗
cos(
ArgLd
)
∗
cos(
LineAng
)
(1+
REOverRLStart
)
-0.8
∗
Z1CircleStart
∗
sin(
ArgLd
)
∗
sin(LineAng)
(1+
XEOverXLStart
)
If 2I0 <
I0MinOp
P6
-
RLd
0
If 2I0 <
I0MinOp
P7
Z1CircleStart
∗
cos(
ArgLd
)
∗
cos(
LineAng
)
(1+
REOverRLStart
)
-
Z1CircleStart
∗
sin(
ArgLd
)
∗
sin(
LineAng
)
(1+
XEOverXLStart
)
P8
-
Z1CircleStart
∗
cos(
ArgLd
)
∗
cos(
LineAng
)
(1+
REOverRLStart
)
Z1CircleStart
∗
sin(
ArgLd
)
∗
sin(
LineAng
)
(1+
XEOverXLStart
)
1.
Change the magnitude and angle of phase-to-earth voltage in phase L1 to achieve impedances
at test points P1, P2, …, P8.
2.
For each test point, observe that the output signals STELEMST and STNDZL1 are activated.
3.
Repeat the above test by injecting phase-to-earth voltage in phase L2 in accordance with test
points and observe that the output signals STELEMST and STNDZL2 are activated.
Circular characteristic
GUID-3753B362-4EE0-4076-A643-044819E6C6DD v1
Select type of earthing system by setting parameter
SystemEarthing
and set to Solidly. Also, Select
CharStartZ<
to Circular and set
OpLoadEnch
to On. Set
Z1CircleStart
,
REOverRLStart
,
XEOverXLStart
,
LineAng
and
ArgLd
to default values. Also, set
RLd
such that its value is lower than
Z1CircleStart
, that is, encroached into operating region.
Phase-to-phase fault
GUID-73E7937D-2823-4A99-BC3E-1413C414D1C4 v2
Test points that are to be considered for measurement accuracy of set impedance reach are shown
in Figure
.
1MRK 506 377-UEN Rev. K
Section 10
Testing functionality by secondary injection
Railway application RER670
75
Commissioning manual
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Содержание Relion 670 series
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