Inputs TAP_POS outputs0 1 0 0 0 0 0 32 20 630 1 0 0 0 0 1 33 21 620 1 0 0 0 1 0 34 22 600 1 0 0 0 1 1 35 23 610 1 0 0 1 0 0 36 24 56... ... ... ... ... ... ...8.3.5 ApplicationTPOSSLTC provides tap position information for other functions as a signedinteger value that can be fed to the tap position input.The position information of the tap changer can be coded in various methods formany applications, for example, the differential protection algorithms. In thisfunction, the binary inputs in the transformer terminal connector are used as inputsto the function. The coding method can be chosen by setting the mode parameter.The available coding methods are BCD, Gray and Natural binary coding. Since thenumber of binary inputs are limited to seven, the coding functions are limited toseven bits including the sign bit and thus the six bits are used in the codingfunctions. The position limits for the tap positions at BCD, Gray and Naturalbinary coding are ±39, ±63 and ±63 respectively.In this example, the transformer tap changer position indication is wired as a mAsignal from the corresponding measuring transducer. The position indication isconnected to input 1 (AI_VAL1) of the X130 (RTD) card. The tap changeroperating range from the minimum to maximum turns of the tap and acorresponding mA signal for the tap position are set in XRGGIO130. Since thevalues of the XRGGIO130 outputs are floating point numbers, the float to integer(T_F32_INT8) conversion is needed before the tap position information can be fedto TPOSSLTC. When there is a wired connection to the TAP_POS connector, thecorresponding tap changer position is seen as the TAP_POS output value that is fedto other functions, for example, OLATCC1. When there is no wired connection tothe TAP_POS connector, the binary inputs are expected to be used for the tapchanger position information.TPOSSLTCBI1BI2BI3BI4BI5SIGN_BITTAP_POSBI0F32 INT8T_F32_INT8AI_VAL1GUID-0F8FDC38-827F-48F2-AC02-499CD3B121D7 V1 ENFigure 356: RTD/analog input configuration exampleSection 8 1YHT530004D05 DMeasurement functions664 615 seriesTechnical Manual
