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Section 11
Testing functionality by secondary injection
I
50
s
EQUATION14059 V1 EN-US
∠I
50s
frequency of I
It
fs
EQUATION14062 V1 EN-US
∠I
tfs
frequency of I
•
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:
•
•
•
•
•
Note that these values identify a point outside the lens characteristic, even if it is close to the point
RE. 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. This is a point
in the plane R-X that is far away from the lens characteristic. Define the following three-phase
symmetrical quantities (the phase angle is related to phase L1):
V
ts
EQUATION14057 V1 EN-US
∠
V
EQUATION14058 V1 EN-US
frequency of V
I
50s
I
=0 A
tfs
•
State 2: main test step.
Define the following three-phase symmetrical quantities (the phase angle is related to phase
L1):
V
ts
EQUATION14057 V1 EN-US
∠
V
EQUATION14058 V1 EN-US
142
1
I
CTs
10459
I
=
×
=
×
50
I
9000
CTp
=0°
= 50 Hz
50s
I
1
CTs
I
10459
=
×
=
×
tf
I
9000
CTp
=0°
= 50 Hz
tfs
VOLTAGE = 13.12 kV
CURRENT = 20918 A
R = 9.01%
X = 65.27%
ROTORANG = 0.04 rad
V
VT s
,
1 1
.
V
1 1 11931
.
=
×
×
=
×
t FwdZ
,
V
VT p
,
ForwardX
=
=
arctan
ts
ForwardR
= 50 Hz
ts
=0 A
V
VT s
,
1 1
.
V
1 1 11931
.
=
×
×
=
×
t FwdZ
,
V
VT p
,
ForwardX
=
=
arctan
ts
ForwardR
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= .
1 162
A
1 162
.
A
=
0 1
.
95 1
.
V
×
=
13 8
.
59 33
.
=
arctan
82. . 14°
8 19
.
0 1
.
95 1
.
V
×
=
13 8
.
59 33
.
=
arctan
82. . 14°
8 19
.
1MRK 504 165-UEN Rev. K
(Equation 23)
(Equation 24)
GUID-0B73C849-107D-40DC-80BB-31CD441BF69A v1
(Equation 25)
(Equation 26)
(Equation 27)
(Equation 28)
Transformer protection RET670
Commissioning manual
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