Entec ETMFC610 - Page 79

Multi-Function Control ETMFC610 http://www.entecene.co.kr
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HANCED
TEC
HNOLOGY
*. NOTE ) Setting value for ‘Source Side’ is available from “GLOBAL SETTING / GENERAL /
SYSTEM / VOLTAGE SENSING” in the menu..
7.1.1.2. Current Sensing
Place a cursor in “CURRENT SENSING” and press [ENT] button, it is moved to this menu.
This Setting group is critical for all over-current protection and fault indication features that have
settings specified in multiples of CT rating. When the relay is ordered, the phase, ground, and
sensitive ground CT inputs must be specified as 1 Amp.
As the phase CTs are connected in wye (star), the calculated phasor sum of the three phase currents
(Ia + Ib + Ic = Neutral Current = 3 I0) is used as the input for protection of the neutral over-current.
In addition, a zero-sequence (core balance) CT which senses current in all of the circuit primary
conductors, or a CT in a neutral grounding conductor may also be used. For this configuration, the
ground CT primary rating must be entered. To detect low level ground fault currents, the sensitive
earth input may be used. In this case, the sensitive ground CT primary rating must be entered.
GLOBAL SETTING/ GENERAL / SYSTEM / CURRENT SENSING / PHA CT Ratio
Range
1 ~ 2000
Default
1000
Step
1
Set phase CT ratio.
GLOBAL SETTING/ GENERAL / SYSTEM / CURRENT SENSING / GND CT Ratio
Range
1 ~ 2000
Default
1000
Step
1
Set ground CT ratio.
GLOBAL SETTING / GENERAL / SYSTEM / CURRENT SENSING / SEF CT Ratio
Range
0(OFF), 0.1 ~ 1000.0
Default
1000.0
Step
0.1
Set sensitive earth CT ratio.
[CURRENT SENSING]
>PHA CT Ratio: 1000
>GND CT Ratio: 1000
>SEF CT Ratio:1000.0
>PHA CT Pol’: FOR
GND CT Pol’: FOR
[1~2000:1]
[CURRENT SENSING]
>PHA CT Ratio: 1000
>GND CT Ratio: 1000
>SEF CT Ratio:1000.0
>PHA CT Pol’: FOR
GND CT Pol’: FOR
[1~2000:1]
[CURRENT SENSING]
PHA CT Ratio: 1000
GND CT Ratio: 1000
>SEF CT Ratio:1000.0
>PHA CT Pol’: FOR
GND CT Pol’ FOR
[0(OFF),0.1~1000.0]