NOTE
If the binary inputs used for encoding are all inactive, this indicates an invalid tap position (regardless of
the display offset). For an invalid tap position, the display shows the position --- or -64 with quality invalid,
exception BCD signed, see Routing of the Binary Inputs (Tap-Coding Type BCD signed), Page 446.
Enter the encoding for the tap in the Encoding column in the Code table. Enter the value according to the
number system previously selected. Select the desired number of taps and number of bits for tap coding. Taps
with the same encoding and taps with 0 coding are not permitted.
Routing of the Binary Inputs (Tap-Coding Type BCD signed)
The following table shows the routing of 3 binary inputs (BI 1 to BI -3) with 7 transformer tap positions desig-
nated 3 to 3. The encoding uses BCD signed.
Table 6-27 Routing of the Binary Inputs (Tap-Coding Type BCD signed)
Example
BI1 BI2 BI3 BI4 BI5 BI6
Tap changer X X X
Meaning BCD 1 BCD 2 Sign
Tap = 1 1 0 1
Using 3 binary inputs, a maximum of 7 tap positions can be mapped with the tap coding type of BCD signed.
This yields the number of tap positions from -3 to 3. If all routed binary inputs indicate 0, this is recognized as
tap 0. The 3 binary inputs must be numbered sequentially.
Tap-coding type: BCD signed
Number of tap positions: 7
Number of bits f. tap code: 3
Tap-display offset: 0
Moving contact (highest binary input): No
Routing the Tap Position to Binary Outputs
For the output of the adjusting commands, route the information step up and step down on one relay each,
see following figure.
[sc_trass7, 1, en_US]
Figure 6-115 Routing the Tap Setting Commands
Control Functions
6.8 Transformer Tap Changers
446 SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017
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