Fault Locator (Mlp3000); Currents Or Voltage Log - GE MLP1000 Manual

Zone 1 or zone 2 distance measuring units:
DMUZIAG, DMUZlBG, DMUZ1CG, DMUZ1AB, DMUZlBC, DMUZlCA.
Zone 3 distance measuring units:
DMUZ3AG, DMUZ3BG, DMUZ3CG, DMUZ3AB, DMUZ3BC, DMUZ3CA.
Fault report:
In the case of a trip the values mentioned below are saved as a fault
report:
- Prefault values IA. IB, IC, and I0.
- Prefault values VA, VB and VC.
- Prefault values IA, IB and VC.
- Time label: date and time.
- Fault distance in km or Miles. (MLP3000 only)
- Fault type: AG, BG, CG, ABG, BCG, CAG, AB, BC, CA, 3PH.
- Type of trip (Z1, Z2, Z3, ROD, LPU)
Using the Mlink program, the events can be saved in an ASCII file, and afterwards
they can be edited and the waves and flags can be displayed using the graphics processor
MLPDATA.

4.14 FAULT LOCATOR (MLP3000).

This function provides, in each oscillographic register fault report, the location in the
line where the fault has been produced and also what type of fault it is.
Phase selectors are used to determine the type of fault. These selectors are
independent from the measuring units.
Once the measuring units have detected a fault in any of the zones protected by the
relay and the protection has tripped, the phase selectors determine the type of fault based
on the presence and angular relations of the sequence current.
Figure 12 shows the phase selectors algorithm:
This algorithm requires only the current phasors of the three phases. From these it
obtains the zero sequence currents, positive and negative referenced to phase A (the
algorithm may be applied in the same way for the sequence currents referenced to another
phase).
This algorithm requires the line data and the fault currents and voltages.

4.15 CURRENTS OR VOLTAGE LOG.

The MLP program includes an hourly register of currents:
GEK-98846A
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