Function Block; Functionality; Operation Principle - ABB RELION 620 Series Technical Manual

Section 7
Measurement functions
7.2.2
7.2.3
7.2.4
662

Function block

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Figure 333: Function block

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.

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 the tap changer position indication function can be described using a
module diagram. All the modules in the diagram are explained in the next sections.
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Figure 334: Functional module diagram
1MAC504801-IB E
620 series ANSI
Technical Manual