Novatech Bitronics M87X Series, Manual

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ML0021 August 15, 2018
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Copyright 2018 Bitronics, LLC
Fault Type: One point representing the fault type is available on Mx71 (Two points on
Mx72 models). The user is able to select Fault Type if it is of interest when creating a
user-configurable point list. The index number will be determined by where the point falls
within the point list. The Fault Type point value represents a set of packed bits. Bit0
represents A-Phase Involved, Bit1 represents B-Phase Involved, Bit2 represents Phase-C
Involved. All other bits (Bit3 – Bit15) always equal Zero. In that way:
(1) A-G fault is indicated by binary value of 1 (0001)
(2) B-G is binary 2 (0010)
(3) A-B is binary 3 (0011)
(4) C-G is binary 4 (0100)
(5) A-C is binary 5 (0101)
(6) B-C is binary 6 (0110)
(7) ABC is binary 7 (0111)
Targets: Four points representing targets are available on Mx71 (Eight points on Mx72
models). The user will be able to select any of the points that are of interest when creating
a user-configurable point list. Index numbers will be determined by where the points fall
within the point list. Target Points: Fault Completed is set when the module has
completed analysis. Fault Target A, Fault Target B, and Fault Target C are set when their
associated phases are involved in the fault. Target points are single bit binaries. Possible
values are 0 and 1.
Fault Counter: One point (Two points on Mx72 models) is available representing the
number of times the fault location algorithm has been triggered. The user will be able to
select Fault Count if it is of interest when creating a user-configurable point list. The index
number will be determined by where the point falls within the point list. The Fault Count
point may be read as a counter change object. This is intended to facilitate notification (via
event polling) that the value of the peak fault current has been freshly updated. The Fault
Count Point simply increments until it rolls over; it cannot be reset.
Target Resets: The above-mentioned Fault Completed point is available to permit the user
to reset targets once all data associated with a fault has been read. The user will be able
to select Reset Targets when creating a user-configurable point. The index number will be
determined by where the point falls within the point list. When the point is reset by writing
a zero to it, the Fault Type point and the Fault Target A,B,C points will be automatically set
to zero as well.
Related points for Bus1, Mx72 model Bus2 points are similar:
4.13.4 SOELOG Output
The soelog will report the fault type and fault distance. Distance will be shown as “per
unit,” and in terms of the users preferred length units. For example, if the line length is
defined as 100km the soelog entry might look like this:
24 30-Jul-2007 01:10:51.300206 Fault AB1 at 0.4949 of line or 49.49 km
4.13.5 Protocol Output
Configurable registers in Modbus and DNP may be used to view the results of the fault