ABB RET670 Commissioning Manual page 159

1MRK 504 165-UEN A
Transformer protection RET670 2.2 IEC
Commissioning manual
Testing functionality by secondary injection
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 1 1 . V
= × ×
ts t FwdZ ,
V
VT p ,
EQUATION14057 V1 EN-US
ForwardX

V arctan
∠ =

ts
ForwardR

EQUATION14058 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
= 180º
tfs
frequency of I = 49.5 Hz
tfs
Expected result: the protection function does not issue either start or trip.
The trajectory of the impedance traverses the lens characteristic in
zone 2
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 0 9 . V
= × ×
ts t FwdZ ,
V
VT p
EQUATION14063 V1 EN-US
0 1 .
1 1 11931 . 95 1
= × × =
13 8 .
59 33 .
  
arctan
 =  =

8 19 .
  
1
= . 1 162 A
×
9000
1
1 162 . A
× =
9000
0 1 .
,
0 9 11931 . 77 81
= × × =
13 8 .
,
Section 11
. V
82. . 14°
GUID-9F0FE404-6D83-4308-9FE4-13259CE7D07A v1
GUID-700F4EA1-B7D9-4B77-829A-433BB67C8A01 v1
. V
(Equation 23)
(Equation 24)
(Equation 25)
(Equation 26)
(Equation 27)
153