Entec ETMFC610, Руководство пользователя, Страница: 270 / 372

Multi-Function Control ETMFC610 http://www.entecene.co.kr
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EN
HANCED
TEC
HNOLOGY
8.3. Directional Controls (67)
Place the curser on “DIRECTION” in GROUP# menu, press [ENT] button to move into this menu.
This menu applies to both “Fault Indication type(FITYPE)” and “Protection type(PROTYPE)”.
The Directional Controls provide fault indication and overcurrent protection in the direction of
power flow. The directional controls are necessary for the fault indication and protection of
multiple feeders, when it has the necessity of finding faults in different directions. The directional
controls are comprised of phase, ground, SEF and negative sequence fault indication and
overcurrent elements.
If directional controls are selected, it will determine whether current flow in each phase is in
forward or reverse direction, as determined by the connection of the phase CTs, selected Maximum
Torque Angle (MTA), voltage and current phasors. To increase security of all directional controls,
add one power frequency cycle of intentional delay to prevent incorrect operation.
The directional controls settings can be different in each GROUP settings.
8.3.1. Phase Directional Controls (67P)
Normal voltage V
1
provides phase pole direction in Power line system. Phase direction is
determined by comparing normal voltage(V
1
) and normal current(I
1
). If an angle between normal
voltage(V
1
) and normal current(I
1
) is within

90 ˚ , the direction is forward otherwise it is
backward(reverse direction). Maximum torque angle is set between
∠
0
˚
and
∠
359
˚
. Max torque
initial angle is set for
∠
300
˚
lead angle for Normal voltage V1 (Initial set value of Max Torque
angle shall be set
∠
300
˚
lead angle).
If Polarized voltage becomes lower than the Minimum polarized Voltage, phase direction control is
lost and phase fault(fault indication type) and phase overcurrent(protection type) are not detected.
On the other hand, if phase direction control is set for ‘NONE’, regardless of phase direction, phase
fault and phase overcurrent are detected.
[DIRECTION]
>1.PHASE
2.GROUND
3.SEF
4.NEG SEQ