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Section 10
Testing functionality by secondary injection
140
æ
ReverseX
Ð
=
ç
V
arctan
è
ts
ReverseR
EQUATION14068 V1 EN
frequency of V
= 50 Hz
ts
I
CTs
I
I
10459
=
×
=
50
s
50
I
CTp
EQUATION14059 V1 EN
∠I
= 0º
50s
frequency of I
= 50 Hz
50s
I
CTs
It
I
10459
=
tf
×
=
fs
I
CTp
EQUATION14062 V1 EN
∠I
= 0º
tfs
frequency of I
= 50 Hz
tf
•
Check that the service values (VOLTAGE, CURRENT, R(%), X(%)) are
according to the injected quantities and that ROTORANG is close to 0 rad. For
this particular injection the service values are:
•
VOLTAGE= 6.49 kV
•
CURRENT= 20918 A
•
R= –0.32%
•
X=–32.57%
•
ROTORANG= 0.08 rad
Note that these values identify a point outside the lens characteristic, even if it is
close to the point SE. Neither START nor TRIP is issued.
Execution of the dynamic test
The test may be performed by using two states of a sequence tool that is a basic feature
of test sets.
•
State 1: pre-test condition.
Steady voltage and current are applied in order to get a steady high impedance,
that is, a point in the plane R-X which is far away from the lens characteristic.
Define the following three-phase symmetrical quantities (the phase angle is
related to phase L1):
V
,
VT s
1 1
.
V
V
=
×
×
,
ts
t RvsZ
V
VT p
,
EQUATION14069 V1 EN
æ
ReverseX
Ð
=
ç
V
arctan
è
ts
ReverseR
EQUATION14068 V1 EN
ö
æ
29.60
÷
-
° =
ç
180
arctan
ø
è
0.29
1
= .
1 162
A
×
9000
1
1 162
.
A
×
=
9000
0 1
.
1 1 5899
.
47 02
.
=
×
×
=
13 8
.
ö
æ
29.60
-
° =
÷
ç
180
arctan
ø
è
0.29
1MRK 506 355-UEN A
ö
÷
-
° = -
°
180
90.56
ø
V
ö
-
° = -
°
÷
180
90.56
ø
Line distance protection REL670 2.1 IEC
Commissioning manual
(Equation 68)
(Equation 69)
(Equation 70)
(Equation 71)
(Equation 72)
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