8.3.2 Function blockGUID-9FF20342-1B3C-45DB-8FB5-50389401AEF5 V2 ENFigure 354: Function block8.3.3 FunctionalityThe tap changer position indication function TPOSSLTC is used for transformertap 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 andthe versatile analog inputs enabling the tap position supervision through mA.There are three user-selectable conversion modes available for the 7–bit binaryinputs where MSB is used as the SIGN bit: the natural binary-coded boolean inputto the signed integer output, binary coded decimal BCD input to the signed integeroutput and binary reflected GRAY coded input to the signed integer output.8.3.4 Operation principleThe function can be enabled and disabled with the Operation setting. Thecorresponding parameter values are "On" and "Off". When the function is disabled,the tap position quality information is changed accordingly. When the tap positioninformation is not available, it is recommended to disable this function with theOperation setting.The operation of the tap changer position indication function can be describedusing a module diagram. All the modules in the diagram are explained in the nextsections.GUID-DDA703D9-A4FF-41D8-9711-AC53A56B34E8 V2 ENFigure 355: Functional module diagram1YHT530004D05 D Section 8Measurement functions615 series 661Technical Manual
