Module: Protection (Prot)
Direction Determination
The direction determination of the device is built in as part of the »Prot« module. This functionality is triggered as
soon as any of the overcurrent modules I[1] … [6] has been configured to work in directional mode (ANSI 67), and
the same is true of the directional mode of the measured and calculated ground fault protection (IG[1] … [4], ANSI
67N).
Measurement Values of the Direction Determination
Three directional values are permanently available under the menu path
[Operation / Measured Values / Direction detection]:
•
»Direction I«
– Determined direction of the phase currents. (See also below, -->
Directional_Feature_PhaseOvercurrent.)
•
»Direction IG meas.«
– Determined direction of the measured ground current. (See also below, -->
Directional_Feature_EarthOvercurrent_IX.)
•
»Direction IG calc.«
– Determined direction of the calculated ground current. (See also below, -->
Directional_Feature_EarthOvercurrent_IR.)
These values offer the same information as can be seen in case of an alarm when checking the status flags under
[Operation / Status Display / Prot].
Only for the MCDGV4:
As the MCDGV4 is fitted with two CT measuring inputs, the direction determination is based
on the current values of the CT Ntrl input (Current transformers on the neutral side, slot X3).
Only for the MCDTV4:
As the MCDTV4 is fitted with two CT measuring inputs, the direction determination is based
on the current values according to the Field Parameter setting
»VX Winding Side«
.
514 MCDGV4 DOK-HB-MCDGV4-2E
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