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1MRK 506 355-UEN A
Line distance protection REL670 2.1 IEC
Commissioning manual
Testing functionality by secondary injection
ForwardR
R
=
×
ZBase
FwdR
100
EQUATION14048 V1 EN
ForwardX
X
=
×
ZBase
FwdX
100
EQUATION14049 V1 EN
ReverseR
=
×
R
ZBase
RvsR
100
EQUATION14050 V1 EN
ReverseR
X
=
×
ZBase
RvsX
100
EQUATION14051 V1 EN
and the voltages that are related to them:
2
V
Z
I
R
=
×
=
t FwdZ
,
FwdZ
t
FwdR
EQUATION14052 V1 EN
2
V
Z
I
R
=
×
=
t RvsZ
,
RvsZ
t
RvsR
EQUATION14053 V1 EN
The previous calculations are in primary values. They are transferred to secondary
values to perform injections by a test set. Primary values are transferred to secondary
values by taking into account the CT ratio and the VT ratio (respectively 9000/1 A and
13.8/0.1 kV in the example).
The magnitude of the secondary voltages, that are related to the points RE and SE of
the R-X plane, needs to be checked.
RE (R
, X
):
FwdR
FwdX
V
VT s
,
V
V
11931
=
×
=
t FwdZs
,
t FwdZ
,
V
VT p
,
EQUATION14054 V1 EN
SE (R
, X
):
RvsR
RvsX
V
,
VT s
5899
V
V
=
×
=
,
,
t RvsZs
t RvsZ
V
VT p
,
EQUATION14055 V1 EN
The tests, which are described in this section, may require voltages that have
magnitude equal to 110% of the previous values. The continuous permissive overload
voltage of the protection voltage channels of the TRM module is 420 V; so the
previous voltages may be applied to the analog channels of the IED continuously.
Limitations may be related to the available test set; the current I
using a factor 2.5 (instead of the maximum value 4) in order to reduce the magnitude
of the test voltage for the points RE and SE.
8 19
.
=
×
0 9522 0 078
.
=
.
Ω
100
59 33
.
=
×
0 9522 0 565
.
=
.
100
0 29
.
=
×
0 9522 0 003
.
=
.
Ω
100
29 6
.
=
×
0 9522 0 282
.
=
.
Ω
100
2
2
X
I
0 078
.
0 565
+
×
=
+
FwdX
t
2
2
X
I
0 003
.
0 282
+
×
=
+
RvsX
t
0 1
.
86 45
.
V
×
=
13 8
.
0 1
.
42 75
.
V
×
=
13 8
.
Section 10
Ω
2
.
20918 0 570 0 20918 11931
.
×
=
×
2
.
20918 0 282 2 20918 5899
.
×
=
×
was calculated by
t
(Equation 8)
(Equation 9)
(Equation 10)
(Equation 11)
V
=
(Equation 12)
V
=
(Equation 13)
(Equation 14)
(Equation 15)
127
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