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