ABB RELION 620 Series Technical Manual page 980

Section 8
Measurement functions
8.3
8.3.1
8.3.2
8.3.3
8.3.4
974
Tap changer position indication TPOSYLTC
Identification
Function description
Tap changer position indication
Function block
GUID-D31468A2-778A-4FF6-A9DE-3508934B6789 V1 EN
Figure 501: Function block
Functionality
The tap changer position indication function TPOSYLTC 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.
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 TPOSYLTC can be described using a module diagram. All the
modules in the diagram are explained in the next sections.
IEC 61850 IEC 60617
identification identification
TPOSYLTC TPOSM
1MRS757644 F
ANSI/IEEE C37.2
device number
84M
620 series
Technical Manual