Siemens siprotec 7SA6, Manual

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Configuration
5-23
7SA6 Manual
C53000-G1176-C156-2
The encoded transformer tap changer position bit pattern is transformed into digital
values between 1 and 62. An unrecognized pattern is interpreted as position 63.
The number of bits coincides with the number of the binary inputs to be configured,
and limits the number of positions to be represented.
Using the display offset, the beginning of the evaluated bits may have an offset of a
programmed number. The stepping of the transfomer taps may be modified, using the
tap interval feature (see example).
Example:
Four transformer position settings are to be represented by three binary inputs, using
the designators 3 through 6. The encoding is binary.
Using three binary inputs (= 3 bits), a maximum of 2
3
= 8 position settings may be rep-
resented in binary code. In order to begin the representation of transformer tap chang-
er positions with the value 3, the display offset is chosen accordingly. The following
must be set on the information property window:
Encoding
Binary
Number of taps
4
Number of bits
3
Display offset
2
Tap interval
1
The three binary inputs used for this must have sequential numbers, such as BI 1,
BI 2, and BI 3.
User Defined Meas-
ured Values (MVU)
and Limit Values
(LVU) For the information type “Measured Values User Defined” (
MVU
), the units, the conver-
sion factor, and the number of significant digits following the decimal point may be
specified. For the information type “Limit Values User Defined” (
LVU
), a limit value may
be programmed (Figure 5-19).
Orientation Desired representation
BI1 BI2 BI3
- - - 63.00
X - - 3.00
- X - 4.00
X X - 5.00
- - X 6.00
X - X 63.00