ABB Relion 670 series - Test of Point RE (R Fwdr, X Fwdx )

11.4.12.2 Test of point RE (R
FwdR
, X
FwdX
)
GUID-911D370F-8767-4D6C-9621-8663DD26006C v1
The trajectory of the impedance does not enter the lens characteristic.
GUID-5C5E9BEB-AA60-474E-ACEC-B972ACFE6FA2 v1
Preliminary steady state test at 50 Hz
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• 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 V
V
V
V
ts t FwdZ
VT s
VT p
= × × = × × =1 1 1 1 11931
0 1
13 8
95 1. .
.
.
.
,
,
,
EQUATION14057 V1 EN-US (Equation 21)
∠ =






=






=V
ForwardX
ForwardR
ts
arctan arctan
.
.
59 33
8 19
82..14°
EQUATION14058 V1 EN-US (Equation 22)
frequency of V
ts
= 50 Hz
I I
I
I
A
s
CTs
CTp
50 50
10459
1
9000
1 162= × = × = .
EQUATION14059 V1 EN-US (Equation 23)
∠I
50s
=0°
frequency of I
50s
= 50 Hz
It I
I
I
A
fs
CTs
CTp
tf= × = × =10459
1
9000
1 162.
EQUATION14062 V1 EN-US (Equation 24)
∠I
tfs
=0°
frequency of I
tfs
= 50 Hz
• 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:
• VOLTAGE = 13.12 kV
• CURRENT = 20918 A
• R = 9.01%
• X = 65.27%
• ROTORANG = 0.04 rad
Note that these values identify a point outside the lens characteristic, even if it is close to the point RE.
Neither START nor TRIP is issued.
Execution of the dynamic test
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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. This 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):
1MRK 504 165-UUS Rev. J Section 11
Testing functionality by secondary injection
Transformer protection RET670 149
Commissioning manual
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