Section 8
1MAC050144-MB C
Measurement functions
594
615 series ANSI
Technical Manual
8.14
Tap change position indication, 84T
8.14.1
Identification
8.14.2
Function block
Figure 320:
Function block
8.14.3
Functionality
The binary converter function 84T is used for converting binary-coded tap position inputs
to their decimal equivalent when a tap position indication is received from the I/O board
with the help of the coded binary inputs.
There are three user-selectable conversion modes available for the 7-bit binary inputs
where MSB is used as the SIGN bit: the natural binary-coded boolean input to the signed
integer output, binary coded decimal BCD input to the signed integer output and binary
reflected GRAY coded input to the signed integer output.
8.14.4
Operation principle
The function can be enabled and disabled with the
Operation
setting. The corresponding
parameter values are Enable and Disable. When the function is disabled, the tap position
quality information is changed accordingly. When the tap position information is not
available, it is recommended to disable this function with the
Operation
setting.
The operation of tap position indication function can be described by using a module
diagram. All the modules in the diagram are explained in the next sections.
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Tap position
TPOSSLTC
TPOSM
84T
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