9.11.5.1 Measuring the operate limit
M14955-48 v5
1. Set the test point (|Z| fault impedance and ZF impedance phase angle ) for a
condition that meets the requirements in table 19.
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
96, 97 and 98
EQUATION123 V1 EN-US (Equation 96)
in % for two- and three-phase faults
EQUATION124 V1 EN-US (Equation 97)
in % for single-phase-to-earth faults
p
3 Z×
x
X0 2 X1 XM±×+
---------------------------------------------
100×=
EQUATION125 V1 EN-US (Equation 98)
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
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
9.11.5.2 Completing the test
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Continue to test another function or end the test by changing the TESTMODE
setting to Off. Restore connections and settings to their original values, if they were
changed for testing purposes.
9.11.6 Limit counter L4UFCNT
GUID-7EBDC372-3407-4577-8B9A-6AB1758A1F34 v2
The Limit counter function L4UFCNT can be tested by connecting a binary input
to the counter and applying pulses to the counter. The speed of the pulses must not
exceed the cycle time of the function. Normally the counter will be tested when
testing the function that the counter is connected to, such as the trip function. When
the function is configured, test it together with the function that operates it. Trigger
1MRK 506 383-UEN A Section 9
Testing functionality by secondary injection
Line distance protection REL650 2.2 IEC 167
Commissioning manual
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