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1MRK 504 165-UEN Rev. K
•
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
EQUATION14069 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
EQUATION14069 V1 EN-US
Ð
V
EQUATION14068 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
Expected result: the protection function does not issue either start or trip.
After each test it is possible to download and study the related disturbance recording.
Transformer protection RET670
Commissioning manual
V
VT s
,
1 1
.
V
1 1 5899
.
=
×
×
=
×
t RvsZ
,
V
VT p
,
æ
ö
ReverseX
=
ç
÷
-
arctan
è
ø
ts
ReverseR
= 50 Hz
ts
= 0 A
V
VT s
,
1 1
.
V
1 1 5899
.
=
×
×
=
×
t RvsZ
,
V
VT p
,
æ
ö
ReverseX
=
ç
÷
-
arctan
è
ø
ts
ReverseR
= 50 Hz
ts
I
1
CTs
I
10459
=
×
=
×
50
9000
I
CTp
= 0º
= 50 Hz
50s
I
1
CTs
10459
I
=
×
=
×
tf
I
9000
CTp
= 180º
= 50.5 Hz
tfs
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0 1
.
47 02
.
V
×
=
13 8
.
æ
ö
29.60
° =
ç
÷
-
180
arctan
180
è
ø
0.29
0 1
.
47 02
.
V
×
=
13 8
.
æ
ö
29.60
° =
ç
÷
-
180
arctan
180
è
ø
0.29
= .
1 162
A
1 162
.
A
=
Testing functionality by secondary injection
° = -
°
90.56
° = -
°
90.56
GUID-7C9F1163-0186-41DA-9D5F-DDA589323B9F v1
Section 11
(Equation 75)
(Equation 76)
(Equation 77)
(Equation 78)
(Equation 79)
(Equation 80)
151
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