8.3 Tap changer position indication 84T8.3.1 IdentificationFunction description IEC 61850identificationIEC 60617identificationANSI/IEEE C37.2device numberTap changer position indication TPOSYLTC TPOSM 84T8.3.2 Function block84TBI0BI1BI2BI3BI4BI5SIGN_BITTAP_POSEND_POS_RTAP_POSEND_POS_LGUID-3A750618-52D7-4C0B-8EB8-781605508E6B V1 ENFigure 479: Function block8.3.3 FunctionalityThe tap changer position indication function 84T is used for transformer tap positionsupervision. The binary inputs can be used for converting a binary-coded tap changerposition 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 enablingthe tap position supervision through mA.There are three user-selectable conversion modes available for the 7-bit binary inputswhere MSB is used as the SIGN bit: the natural binary-coded boolean input to the signedinteger output, binary coded decimal BCD input to the signed integer output and binaryreflected GRAY coded input to the signed integer output.8.3.4 Operation principleThe function can be enabled and disabled with the Operation setting. The correspondingparameter values are “Enable” and “Disable”. When the function is disabled, the tapposition quality information is changed accordingly. When the tap position information isnot available, it is recommended to disable this function with the Operation setting.Section 8 1MAC059074-MB AMeasurement functions950 615 series ANSITechnical Manual
