ABB RED670 Commissioning Manual page 163

1MRK 505 378-UEN A
Line differential protection RED670 2.2 IEC
Commissioning manual
Testing functionality by secondary injection
ForwardX

V arctan
∠ =

ts
ForwardR

EQUATION14058 V1 EN-US
frequency of V = 50 Hz
ts
I
I I CTs
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 3.14 rad.
For this particular injection the service values are:
• VOLTAGE = 10.74 kV
• CURRENT = 20918 A
• R = 7.37%
• X = 53.40%
• ROTORANG = -3.09 rad
Note that these values identify a point inside the lens characteristic, in the zone
2, that is close to the point RE. 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 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 FwdZ ,
V
VT p
EQUATION14063 V1 EN-US
ForwardX

V arctan
∠ =

ts
ForwardR

EQUATION14058 V1 EN-US
59 33 .
  
arctan
 =  =

8 19 .
  
1
A
= . 1 162
×
9000
1
1 162 . A
× =
9000
0 1 .
,
0 9 11931 . 77 81
= × × =
13 8 .
,
59 33 .
  
arctan
 =  =

8 19 .
  
Section 11
82. . 14°
GUID-028D7D67-B61A-4A7F-9978-4A0A41231B04 v1
V
.
82. . 14°
(Equation 31)
(Equation 32)
(Equation 33)
(Equation 34)
(Equation 35)
157