Hitachi RET670 Commissioning Manual page 156

Section 11
Testing functionality by secondary injection
frequency of I
It
fs
EQUATION14062 V1 EN-US
∠I
tfs
frequency of I
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
ts
EQUATION14069 V1 EN-US
Ð
V
EQUATION14068 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 0 rad. For this particular injection the service values
are:
•
•
•
•
•
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.
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.
150
= 50 Hz
50s
I 1
CTs
I 10459
= × = ×
tf
9000
I
CTp
= 180º
= 50.5 Hz
tfs
V
VT s ,
1 1 . 1 1 5899 .
V
= × × = ×
t RvsZ ,
V
,
VT p
æ ö
ReverseX
= ç ÷ -
arctan
è ø
ts
ReverseR
= 50 Hz
ts
1
I
CTs 10459
I
= × = ×
50
9000
I
CTp
= 0º
= 50 Hz
50s
I 1
I CTs 10459
= × = ×
tf
I 9000
CTp
= 0º
= 50 Hz
tf
VOLTAGE= 6.49 kV
CURRENT= 20918 A
R= –0.32%
X=–32.57%
ROTORANG= 0.08 rad
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1 162 . A
=
0 1 .
47 02 .
V
× =
13 8 .
æ ö
29.60
° = ç ÷ -
180 arctan 180
è ø
0.29
= . 1 162
A
1 162 . A
=
1MRK 504 165-UEN Rev. K
GUID-189FECED-12A7-4A41-BCCF-D93C0FF9FA41 v1
GUID-448D5357-6CC2-438E-83CA-25FD381B7DFF v1
° = - °
90.56
GUID-31EF4F76-8FC8-4952-896C-B3A8A5FD635A v1
Transformer protection RET670
Commissioning manual
(Equation 70)
(Equation 71)
(Equation 72)
(Equation 73)
(Equation 74)