The tap changer position value is given in parentheses. For example, (0) indicates
that there is no tap changer position connected or the tap changer position value
quality is bad. Typically, if no tap changer position is connected, all the
TPOSSLTC binary inputs are FALSE by default and the value shown is (0). A
value other than zero indicates bad quality. A bad-quality tap changer position is
dealt by OLATCC like unconnected tap position information.
9.5.7 Operation mode selection
OLATCC has the Operation mode and Auto parallel mode settings for selecting the
desired operation mode. The Operation mode setting can have any of the following
values: "Manual", "Auto single", "Auto parallel" and "Input control". If the
Operation mode setting is set to "Input control", the acting operation mode is
determined by the inputs PARALLEL and AUTO. The PARALLEL input defines if
the transformer (voltage regulator) is in the parallel or single mode. The AUTO
input defines the operation status in the single mode. The output signals
PARALLEL and AUTO echo fed input signals when the Operation mode setting is
set to "Input control". Otherwise the PARALLEL and AUTO monitored data
represent acting "Parallel or single operation" and "Auto/Manual indication"
respectively.
Table 627: Acting operation mode determined by the operation mode inputs
PARALLEL
AUTO
Operation Mode
0 0 Manual
0 1 Auto single
1 0 or 1 Auto parallel
Furthermore, if Operation mode has been set to "Auto parallel", the second setting
parameter Auto parallel mode defines the parallel mode and the alternatives are
"Auto master", "Auto follower", "MCC" or "NRP".
The acting operation mode can be read from the monitored data OPR_MODE_STS.
Command Exclusion
An acting operation mode change using two inputs (PARALLEL and AUTO) and
setting group change (either with the input or via menu) is needed when the acting
operation mode must be changed automatically, that is, there is a logic which
drives these two inputs and setting group change based on the status information
from the circuit breakers.
The common Local/Remote (L/R) exclusion concerns the manual raising and
lowering commands of OLATCC, that is, it internally proves the exclusion
mechanism to prevent the remote commands (from SCADA) when the IED is in
local mode.
Section 9 1YHT530004D05 D
Control functions
730 615 series
Technical Manual
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