Hitachi RET670 Commissioning Manual page 149

1MRK 504 165-UEN Rev. K
frequency of V
I
50 s
EQUATION14059 V1 EN-US
∠I
50s
frequency of I
It
fs
EQUATION14062 V1 EN-US
∠I
tfs
frequency of I
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
ts
EQUATION14063 V1 EN-US
∠
V
EQUATION14058 V1 EN-US
frequency of V
I
50 s
EQUATION14059 V1 EN-US
∠I
50s
frequency of I
It
fs
EQUATION14062 V1 EN-US
∠I
tfs
frequency of I
• 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:
Transformer protection RET670
Commissioning manual
= 50 Hz
ts
I 1
CTs
I 10459
= × = ×
50
9000
I
CTp
= 0º
= 50 Hz
50s
I 1
CTs 10459
I
= × = ×
tf
I 9000
CTp
= 180º
= 49.5 Hz
tfs
V
VT s ,
0 9 . V 0 9 11931 .
= × × = ×
t FwdZ ,
V
VT p ,
 
ForwardX
=  =
arctan 
ts
 
ForwardR
= 50 Hz
ts
I 1
CTs
I 10459
= × = ×
50
9000
I
CTp
= 0º
= 50 Hz
50s
1
I
CTs
I 10459
= × = ×
tf
I 9000
CTp
= 0º
= 50 Hz
tf
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= . 1 162 A
1 162 .
A
=
0 1 .
77 81 . V
× =
13 8 .
 
59 33 .
 =
arctan  82. . 14°
 
8 19 .
= . 1 162 A
1 162 . A
=
Section 11
Testing functionality by secondary injection
(Equation 29)
(Equation 30)
GUID-9F0FE404-6D83-4308-9FE4-13259CE7D07A v1
GUID-700F4EA1-B7D9-4B77-829A-433BB67C8A01 v1
(Equation 31)
(Equation 32)
(Equation 33)
(Equation 34)
143