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1MRK 504 165-UEN Rev. K
∠
V
EQUATION14058 V1 EN-US
frequency of V
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 3.14 rad. For this particular injection the service
values are:
•
•
•
•
•
Note that these values identify a point inside the lens characteristic in zone 1, that is close to the
boundary between zone 1 and zone 2. The START is issued, but no TRIP is performed.
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
ts
EQUATION14066 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):
Transformer protection RET670
Commissioning manual
ForwardX
=
=
arctan
ts
ForwardR
= 50 Hz
ts
1
I
CTs
10459
I
=
×
=
×
50
I
9000
CTp
= 0º
= 50 Hz
50s
I
1
CTs
I
10459
=
×
=
×
tf
I
9000
CTp
= 0º
= 50 Hz
tf
VOLTAGE = 1.29 kV
CURRENT = 20918 A
R = 0.89%
X=6.42%
ROTORANG = -3.04 rad
V
VT s
,
0 9
.
V
0 9 1435
.
=
×
×
=
×
t RZ
,
1
V
VT p
,
ForwardX
=
=
arctan
ts
ForwardR
= 50 Hz
ts
= 0 A
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59 33
.
=
arctan
82. . 14°
8 19
.
= .
1 162
A
1 162
.
A
=
0 1
.
9 36
.
V
×
=
13 8
.
59 33
.
=
arctan
82. . 14°
8 19
.
Section 11
Testing functionality by secondary injection
(Equation 52)
(Equation 53)
(Equation 54)
GUID-98707DB3-9A1A-4458-9704-25F8FCB94B79 v1
(Equation 55)
(Equation 56)
147
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