Inputs TAP_POS outputs
0 1 0 0 0 0 0 32 20 63
0 1 0 0 0 0 1 33 21 62
0 1 0 0 0 1 0 34 22 60
0 1 0 0 0 1 1 35 23 61
0 1 0 0 1 0 0 36 24 56
... ... ... ... ... ... ...
8.3.5 Application
TPOSSLTC provides tap position information for other functions as a signed
integer value that can be fed to the tap position input.
The position information of the tap changer can be coded in various methods for
many applications, for example, the differential protection algorithms. In this
function, the binary inputs in the transformer terminal connector are used as inputs
to 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 the
number of binary inputs are limited to seven, the coding functions are limited to
seven bits including the sign bit and thus the six bits are used in the coding
functions. The position limits for the tap positions at BCD, Gray and Natural
binary coding are ±39, ±63 and ±63 respectively.
In this example, the transformer tap changer position indication is wired as a mA
signal from the corresponding measuring transducer. The position indication is
connected to input 1 (AI_VAL1) of the X130 (RTD) card. The tap changer
operating range from the minimum to maximum turns of the tap and a
corresponding mA signal for the tap position are set in XRGGIO130. Since the
values 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 fed
to TPOSSLTC. When there is a wired connection to the TAP_POS connector, the
corresponding tap changer position is seen as the TAP_POS output value that is fed
to other functions, for example, OLATCC1. When there is no wired connection to
the TAP_POS connector, the binary inputs are expected to be used for the tap
changer position information.
TPOSSLTC
BI1
BI2
BI3
BI4
BI5
SIGN_BIT
TAP_POS
BI0
F32 INT8
T_F32_INT8
AI_VAL1
GUID-0F8FDC38-827F-48F2-AC02-499CD3B121D7 V1 EN
Figure 356: RTD/analog input configuration example
Section 8 1YHT530004D05 D
Measurement functions
664 615 series
Technical Manual
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