Table 39: Test settings
Parameter Condition
I Higher than 30% I
r
Healthy conditions U = 63,5 V, I = 0 A & ZF = 0°
Impedance |Z| Test point
Note:
•
Z
x
£ (X0 + 2 · X1)/3 For single-phase faults
•
Z
x
£ X1 For three and two phase faults
•
Z
x
£ (X0 + 2 · X1 XM)/3 For single-phase fault with mutual
zero-sequence current
Impedance angle ZF
Test angle
•
ZF arctan[(X0 + 2 · X1) / (R0 + 2R1)] For single-phase faults
•
ZF arctan(X1/R1) For two-phase faults
10.13.5.1 Measuring the operate limit
1. Set the test point (|Z| fault impedance and ZF impedance phase angle ) for a
condition that meets the requirements in table
39.
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
equations
110, 111 and 112
EQUATION123 V1 EN (Equation 110)
in % for two- and three-phase faults
EQUATION124 V1 EN
(Equation 111)
in % for single-phase-to-earth faults
p
3 Z×
x
X0 2 X1 XM±×+
---------------------------------------------
100×=
EQUATION125 V1 EN (Equation 112)
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
x
= set test point on the test set
Table continues on next page
Section 10 1MRK 506 355-UEN A
Testing functionality by secondary injection
238 Line distance protection REL670 2.1 IEC
Commissioning manual
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