It
I
I
I
A
fs
CTs
CTp
tf
=
×
=
×
=
10459
1
9000
1 162
.
EQUATION14062 V1 EN-US
(Equation 70)
∠
I
tfs
= 0º
frequency of
I
tf
= 50 Hz
•
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
GUID-31EF4F76-8FC8-4952-896C-B3A8A5FD635A v1
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
V
V
V
V
ts
t RvsZ
VT s
VT p
=
×
×
=
×
×
=
1 1
1 1 5899
0 1
13 8
47 02
.
.
.
.
.
,
,
,
EQUATION14069 V1 EN-US
(Equation 71)
29.60
arctan
180
arctan
180
90.56
0.29
ts
ReverseX
V
ReverseR
Ð
=
-
° =
-
° = -
°
æ
ö
æ
ö
ç
÷
ç
÷
è
ø
è
ø
EQUATION14068 V1 EN-US
(Equation 72)
frequency of V
ts
= 50 Hz
I
50s
= 0 A
I
tfs
= 0 A
•
State 2: main test step.
Define the following three-phase symmetrical quantities (the phase angle is related to
phase L1):
V
V
V
V
V
ts
t RvsZ
VT s
VT p
=
×
×
=
×
×
=
1 1
1 1 5899
0 1
13 8
47 02
.
.
.
.
.
,
,
,
EQUATION14069 V1 EN-US
(Equation 73)
29.60
arctan
180
arctan
180
90.56
0.29
ts
ReverseX
V
ReverseR
Ð
=
-
° =
-
° = -
°
æ
ö
æ
ö
ç
÷
ç
÷
è
ø
è
ø
EQUATION14068 V1 EN-US
(Equation 74)
frequency of V
ts
= 50 Hz
1MRK 502 067-UEN B
Section 12
Testing functionality by secondary injection
145
Commissioning manual
