ABB RET670 Commissioning Manual page 168

Section 11
Testing functionality by secondary injection
162
Expected result: start of the protection function and trip in zone 1 when trip
conditions are fulfilled.
The trajectory of the impedance does not enter the lens characteristic
Preliminary steady state test at 50 Hz
• Go to Main menu/Test/Function status/Impedance protection/
OutOfStep(78,Ucos)/OOSPPAM(78,Ucos):1/Outputs to check the available
service values of the function block OOSPPAM.
• Apply the following three-phase symmetrical quantities (the phase angle is
related to phase L1):
V
VT s ,
V 1 1 . V
= × ×
ts t RvsZ ,
V
VT p ,
EQUATION14069 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
= × =
50 s 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
= 0º
tfs
frequency of I = 50 Hz
tf
• 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:
• VOLTAGE= 6.49 kV
• CURRENT= 20918 A
• R= –0.32%
• X=–32.57%
• ROTORANG= 0.08 rad
Note that these values identify a point outside the lens characteristic, even if it
is close to the point SE. Neither START nor TRIP is issued.
0 1 .
1 1 5899 . 47 02 .
= × × =
13 8 .
ö æ
29.60
÷ - ° = ç
180 arctan
ø è
0.29
1
= . 1 162 A
×
9000
1
1 162 . A
× =
9000
1MRK 504 165-UEN A
GUID-189FECED-12A7-4A41-BCCF-D93C0FF9FA41 v1
GUID-448D5357-6CC2-438E-83CA-25FD381B7DFF v1
V
ö
÷ - ° = - °
180 90.56
ø
Transformer protection RET670 2.2 IEC
Commissioning manual
(Equation 67)
(Equation 68)
(Equation 69)
(Equation 70)