The tap position validity is set to good in all valid cases. The quality is set to bad in
invalid combinations in the binary inputs. For example, when the “BCD2INT” mode
is selected and the input binary combination is “0001101”, the quality is set to bad.
For negative values, when the SIGN_BIT is set to TRUE (1) and the input binary
combination is “1011011”, the quality is set to bad.
If the tap changer has auxiliary contacts for indicating the extreme positions of
the tap changer, their status can be connected to END_POS_R and END_POS_L
inputs. The END_POS_R (End position raise or highest allowed tap position reached)
status refers to the extreme position that results in the highest number of the
taps in the tap changer. Similarly, END_POS_L (End position lower or lowest allowed
tap position reached) status refers to the extreme position that results in the
lowest number of the taps in the tap changer. TAP_POS output is dedicated for
transferring the validated tap position for the functions that need tap position
information, for example OLATCC and TRxPTDF. It includes both the actual position
information and the status of reached end positions, assuming that inputs
END_POS_R and END_POS_L are connected.
Table 954: Truth table of the decoding modes
Inputs TAP_POS outputs
SIGN_
BIT
BI5 BI4 BI3 BI2 BI1 BI0 NAT2I
NT
BCD2I
NT
GRAY2
INT
... ... ... ... ... ... ...
1 0 0 0 0 1 1 -3 -3 -2
1 0 0 0 0 1 0 -2 -2 -3
1 0 0 0 0 0 1 -1 -1 -1
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 1 1 1 1
0 0 0 0 0 1 0 2 2 3
0 0 0 0 0 1 1 3 3 2
0 0 0 0 1 0 0 4 4 7
0 0 0 0 1 0 1 5 5 6
0 0 0 0 1 1 0 6 6 4
0 0 0 0 1 1 1 7 7 5
0 0 0 1 0 0 0 8 8 15
0 0 0 1 0 0 1 9 9 14
0 0 0 1 0 1 0 10 9 12
0 0 0 1 0 1 1 11 9 13
0 0 0 1 1 0 0 12 9 8
0 0 0 1 1 0 1 13 9 9
0 0 0 1 1 1 0 14 9 11
0 0 0 1 1 1 1 15 9 10
0 0 1 0 0 0 0 16 10 31
0 0 1 0 0 0 1 17 11 30
Table continues on the next page
Measurement functions 1MRS757644 H
978 620 series
Technical Manual
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