ABB REL670 Installation And Commissioning Manual page 170

14.3.1
162
Monitoring
Table 22: Test settings
Parameter:
I
Healthy conditions
Impedance |Z|
Impedance angle Z Φ
Measuring the operate limit
Procedure
Set the test point (|Z| fault impedance and Z Φ impedance phase
1.
angle ) for a condition that meets the requirements in
2. Subject the IED to healthy normal load conditions for at least two
seconds.
3. Apply a fault condition.
Check that the distance-to-fault value displayed on the HMI complies
with the following equations (the error should be less than five percent):
Z
x
⋅
p ------ - 100
=
X1
in % for two- and three-phase faults
in % for single-phase-to-earth faults
in % for single-phase-to-earth faults with mutual zero sequence current.
Where:
p = the expected value of a distance to fault in percent
Z = set test point on the test set
x
X0 = set zero-sequence reactance of a line
X1 = set positive-sequence reactance of a line
XM = set mutual zero-sequence impedance of a line
Verifying settings by secondary
Condition:
Higher than 30% I
r
U = 63,5 V, I = 0 A & ZF = 0 °
Test point
Note:
≤ (X0 + 2 · X1)/3For single-phase faults
• Z
x
≤ X1 For three and two phase faults
• Z
x
≤ (X0 + 2 · X1 XM)/3For single-phase fault with mutual
• Z
x
zero-sequence current
Test angle
Z Φ arctan[(X0 + 2 · X1) / (R0 + 2R1)] For single-phase faults
•
Z Φ arctan(X1/R1)For two-phase faults
•
Chapter 11
injection
table 22.