in % for two- and three-phase faults
EQUATION124 V1 EN-US (Equation 109)
in % for single-phase-to-earth faults
p
3 Z×
x
X0 2 X1 XM±×+
---------------------------------------------
100×=
EQUATION125 V1 EN-US (Equation 110)
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
11.13.5.2 Completing the test
M14955-84 v6
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.
11.13.6
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
the function and check that the counter result corresponds to the number of
operations.
11.13.6.1 Completing the test
GUID-325F040B-BADC-4281-B965-9B7D6BFA3E15 v1
Continue to test another function or end the test by changing the Test mode setting
to Off. Restore connections and settings to their original values, if they were
changed for testing purposes.
Section 11 1MRK 505 378-UEN A
Testing functionality by secondary injection
266 Line differential protection RED670 2.2 IEC
Commissioning manual
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