ABB RET670 Commissioning Manual page 162

Section 11
Testing functionality by secondary injection
156
V
VT s ,
V 1 1 . V
= × ×
ts t RZ , 1
V
VT p ,
EQUATION14065 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
It I CTs
10459
= × =
tf
fs
I
CTp
EQUATION14062 V1 EN-US
∠I
= 0º
tfs
frequency of I = 50 Hz
tfs
• 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:
• VOLTAGE = 1.58 kV
• CURRENT = 20918 A
• R = 1.08%
• X = 7.85%
• ROTORANG = -3.04 rad
Note that these values identify a point inside the lens characteristic, in the Zone 2,
that is close to the boundary between zone 1 and zone 2. 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 that 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 1 1 . V
= × ×
ts t RZ , 1
V
VT p ,
EQUATION14065 V1 EN-US
0 1 .
1 1 1435 . 11 44 .
= × × =
13 8 .
59 33 .
  
arctan 82. . 14°
 =  =

8 19 .
  
1
= . 1 162 A
×
9000
1
A
1 162 .
× =
9000
0 1 .
1 1 1435 . 11 44 .
= × × =
13 8 .
1MRK 504 165-UEN A
V
GUID-53964189-42E4-4C4B-BFCD-64888BA938EF v1
V
Transformer protection RET670 2.2 IEC
Commissioning manual
(Equation 37)
(Equation 38)
(Equation 39)
(Equation 40)
(Equation 41)