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Section 11
Testing functionality by secondary injection
p
EQUATION124 V1 EN-US
in % for single-phase-to-earth faults
p
IECEQUATION18001 V1 EN-US
in % for single-phase-to-earth faults with mutual zero sequence current.
Where:
p
Z
X0
X1
XM
11.13.14.3
Two ended fault locator
The two ended fault locator requires two RED670 IEDs at the local and remote ends, which are
connected through LDCM 2Mbps communication to transmit and receive the signals. The signals
transmitted through the LDCM should be of primary values.
The samples taken from both stations must be absolutely time synchronized. Check for the time
synchronization using the disturbance records from IEDs located at local and remote stations.
Check the function settings related to LDCM, TRM, disturbance record and SMTRFLO for the correct
operation of two ended method and ensure synchronization of the samples.
(2Mbps)
RED670
Substation A
IEC17000240 V1 EN-US
Figure 56:
248
×
3 Z
=
×
x
100
+ ×
X0 2 X1
3 Z
X
100
X0 2 X1 M
= 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
LDCM
Overview of IED set up for two ended fault location
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GPS
(2Mbps)
RED670
Substation B
1MRK 505 378-UEN Rev. K
GUID-3C4909B4-C3A8-4697-A202-6E4E92E0A0B8 v2
LDCM
IEC17000240-1-en.vsdx
Line differential protection RED670
Commissioning manual
(Equation 112)
(Equation 113)
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