The recommended and the default value for Phase supervision is “Pos
sequence”.
If the magnitude of the voltage level of any of the monitored voltage signal, defined by the
Phase supervision setting, drops below Under Volt Blk value or exceeds Over Volt Blk
value, the calculation of vector shift is disabled and the INT_BLKD output is activated.
The function is blocked and LOWAMPL_BLKD is activated, if the measured frequency
deviates ±5% from the nominal value.
The magnitude of calculated vector shift for three phase-to-ground or phase-to-phase
voltages, VSHIFT_A_AB, VSHIFT_B_BC and VSHIFT_C_CA or positive sequence
voltage V1SHIFT, which resulted in the activation of last TRIP output, are available in
the Monitored data view.
The activation of BLOCK input deactivates the INT_BLKD output.
GUID-174B2AC6-B830-4A0D-B072-80FFF3EBF159 V1 EN
Figure 335: Vector shift during Loss of Mains
Pulse timer
Once the Pulse timer is activated, it activates the TRIP output. The pulse length of TRIP
is fixed to 100 ms.
The activation of the BLOCK input deactivates the TRIP binary output and resets the
timer.
4.5.8.5 Application
Use of distributed generation (DG) units is increasing due to liberalized markets
(deregulation) and the global trend to use more renewable sources of energy. They
Section 4 1MAC059074-MB A
Protection functions
668 615 series ANSI
Technical Manual
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