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Section 11
Testing functionality by secondary injection
120
I
CTs
I
I
10459
=
×
=
50
s
50
I
CTp
EQUATION14059 V1 EN
∠I
= 0º
50s
frequency of I
= 50 Hz
50s
I
It
I
CTs
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
,
V
1 1
.
V
=
×
×
ts
t RvsZ
,
V
,
VT p
EQUATION14069 V1 EN
æ
ReverseX
Ð
=
ç
V
arctan
è
ts
ReverseR
EQUATION14068 V1 EN
frequency of V
= 50 Hz
ts
I
= 0 A
50s
1
= .
1 162
A
×
9000
1
1 162
.
A
×
=
9000
0 1
.
1 1 5899
.
47 02
.
V
=
×
×
=
13 8
.
ö
æ
29.60
÷
-
° =
ç
180
arctan
ø
è
0.29
1MRK 511 366-UUS -
ö
÷
-
° = -
°
180
90.56
ø
Commissioning manual
(Equation 69)
(Equation 70)
(Equation 71)
(Equation 72)
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