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1MRK 504 165-UEN Rev. K
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
point SE. 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
EQUATION14067 V1 EN-US
Ð
V
EQUATION14068 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
EQUATION14067 V1 EN-US
Ð
V
EQUATION14068 V1 EN-US
frequency of V
I
50
s
EQUATION14059 V1 EN-US
∠I
50s
Transformer protection RET670
Commissioning manual
I
1
CTs
10459
I
=
×
=
×
tf
I
9000
CTp
= 0º
= 50 Hz
tf
VOLTAGE = 5.31 kV
CURRENT = 20918 A
R = -0.26%
X = -26.65%
ROTORANG = -3.06 rad
V
VT s
,
0 9
.
0 9 5899
.
V
=
×
×
=
×
,
t RvsZ
V
VT p
,
æ
ö
ReverseX
=
ç
÷
-
arctan
è
ø
ts
ReverseR
= 50 Hz
ts
= 0 A
V
VT s
,
0 9
.
0 9 5899
.
V
=
×
×
=
×
,
t RvsZ
V
VT p
,
æ
ö
ReverseX
=
-
ç
÷
arctan
è
ø
ts
ReverseR
= 50 Hz
ts
I
1
CTs
I
10459
=
×
=
×
50
I
9000
CTp
= 0º
© 2017 - 2022 Hitachi Energy. All rights reserved
1 162
.
A
=
0 1
.
38 47
.
V
×
=
13 8
.
æ
ö
29.60
° =
ç
÷
-
180
arctan
180
è
ø
0.29
0 1
.
38 47
.
V
×
=
13 8
.
æ
ö
29.60
° =
-
ç
÷
180
arctan
180
è
ø
0.29
= .
1 162
A
Testing functionality by secondary injection
GUID-FF6DCD5B-96AA-4255-8740-B85C8C7148F5 v1
° = -
°
90.56
° = -
°
90.56
Section 11
(Equation 64)
(Equation 65)
(Equation 66)
(Equation 67)
(Equation 68)
(Equation 69)
149
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