Completing The Test; Fault Locator Smtrflo - Hitachi RED670 Commissioning Manual

Section 11
Testing functionality by secondary injection
Check that the distance-to-fault value displayed on the HMI complies with
Equation 109
p
EQUATION123 V1 EN-US
in % for two- and three-phase faults
p
EQUATION124 V1 EN-US
in % for single-phase-to-earth faults
p
EQUATION125 V1 EN-US
in % for single-phase-to-earth faults with mutual zero sequence current.
Where:
p
Z
X0
X1
XM
11.13.13.4

Completing the test

Continue to test another function or end the test by changing the TESTMODE setting to Off. Restore
connections and settings to the original values, if changed for testing purposes.
11.13.14

Fault locator SMTRFLO

Prepare the IED for verification of settings outlined in Section
The fault locator function (SMTRFLO) depends on other functions to work properly, that is, phase
selection information from distance protection function and analog information supplied by the trip
value recorder function. Check that proper binary start and phase selection signals are connected
and voltage and current signals are configured (parameter settings).
The result is displayed on the local HMI or via PCM600. Distances to faults for the last 100 recorded
disturbances can be found on the local HMI under Main menu/Disturbance Records/Disturbance
#n(n = 1–100)/General Information
If PCM600 is used, the result is displayed on the recording list after upload, including loop selection
information.
246
and Equation 110
Z
x
×
------ - 100
=
X1
×
3 Z
= ×
100
x
+ ×
X0 2 X1
×
3 Z
x
-------------------------------------------- - 100 ×
=
× ±
X0 2 X1 XM +
= the expected value of a distance to fault in percent
= set test point on the test set
x
= set zero-sequence reactance of a line
= set positive-sequence reactance of a line
= set mutual zero-sequence impedance of a line
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1MRK 505 378-UEN Rev. K
Equation
GUID-3D5751C7-20EA-40A1-A5B1-F49088B8C168 v2
"Preparing the IED to verify
Line differential protection RED670
Commissioning manual
108,
(Equation 108)
(Equation 109)
(Equation 110)
M14955-84 v6
settings".