The harmonics current I_HARM_RES is available in the monitored data view. The value
is also sent over horizontal communication to the other protection relays on the parallel
feeders configured in the protection scheme.
Normalized output
0.5
0
0
1.0
Frequency
2ff
GUID-F05BA8C4-AC2B-420C-AE9D-946E815682D5 V1 EN
Figure 194: High-pass filter
Level detector
The harmonics current is compared to the Pickup value setting. If the value exceeds the
value of the Pickup value setting, Level detector sends an enabling signal to the Timer
module.
Current comparison
The maximum of the harmonics currents reported by other parallel feeders in the
substation, that is, in the same busbar, is fed to the function through the I_REF_RES
input. If the locally measured harmonics current is higher than I_REF_RES, the enabling
signal is sent to Timer.
If the locally measured harmonics current is lower than I_REF_RES, the fault is not in
that feeder. The detected situation blocks Timer internally, and simultaneously also the
BLKD_I_REF output is activated.
The module also supervises the communication channel validity which is reported to the
Timer.
1MAC059074-MB A Section 4
Protection functions
615 series ANSI 403
Technical Manual
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