ABB RET670 Commissioning Manual page 167

1MRK 504 165-UEN A
Transformer protection RET670 2.2 IEC
Commissioning manual
Testing functionality by secondary injection
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 V
0 9 .
= × ×
ts t RvsZ ,
V
VT p ,
EQUATION14067 V1 EN-US
æ
ReverseX
Ð = ç
V arctan
è
ts
ReverseR
EQUATION14068 V1 EN-US
frequency of V = 50 Hz
ts
I = 0 A
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
VT s ,
V 0 9 . V
= × ×
ts t RvsZ ,
V
VT p ,
EQUATION14067 V1 EN-US
æ
ReverseX
Ð = ç
V arctan
è
ts
ReverseR
EQUATION14068 V1 EN-US
frequency of V = 50 Hz
ts
I
CTs
I I 10459
= × =
s
50 50
I
CTp
EQUATION14059 V1 EN-US
∠I
= 0º
50s
frequency of I = 50 Hz
50s
I
CTs
It I 10459
= × =
tf
fs
I
CTp
EQUATION14062 V1 EN-US
∠I
= 180º
tfs
frequency of I = 50.5 Hz
tfs
0 1 .
0 9 5899 . 38 47 .
= × × =
13 8 .
ö æ
29.60
÷ - ° = ç
180 arctan
ø è
0.29
0 1 .
0 9 5899 . 38 47 .
= × × =
13 8 .
ö æ
29.60
÷ - ° = ç
180 arctan
ø è
0.29
1
= . 1 162 A
×
9000
1
1 162 . A
× =
9000
Section 11
GUID-FF6DCD5B-96AA-4255-8740-B85C8C7148F5 v1
V
ö
÷ - ° = - °
180 90.56
ø
V
ö
÷ - ° = - °
180 90.56
ø
(Equation 61)
(Equation 62)
(Equation 63)
(Equation 64)
(Equation 65)
(Equation 66)
161