ABB REF615 F - Function Block

8.3.2 Function block
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Figure 354: Function block
8.3.3 Functionality
The tap changer position indication function TPOSSLTC is used for transformer
tap position supervision. The binary inputs can be used for converting a binary-
coded tap changer position to a tap position status indication. The X130 (RTD)
card, available as an option, provides the RTD sensor information to be used and
the versatile analog inputs enabling the tap position supervision through mA.
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.
8.3.4 Operation principle
The function can be enabled and disabled with the Operation setting. The
corresponding parameter values are "On" and "Off". 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 355: Functional module diagram
1YHT530004D05 D Section 8
Measurement functions
615 series 661
Technical Manual