GE 845 Instruction Manual page 430

CONTROL
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For PBs supporting one breaker only, the Local Control Mode menu includes the setpoint
"Select Before Operate", which can be set to either Enabled or Disabled. When it is set to
Disabled, tagging, blocking and block bypassing commands are disabled from both Local
and Remote control. In this mode the breaker can be controlled directly by the
programmed Open and Close PBs. The local control for the disconnect switches is
suspended. In this mode they can only be controlled remotely, i.e. using pre-programmed
contact inputs, virtual inputs, comms, or any selected FlexLogic operand for closing and
opening commands. The remote block and block bypass flags are also suspended. With
Select Before Operate set to Disabled the relay behaves similar to some other legacy
relays, where when in Local mode the breaker is directly controlled by pressing the Open
and Close PBs without additional confirmation, and when in Remote mode the breaker is
directly controlled by executing the remote open and close commands from the
configured setpoints.
When the "Select Before Operate" setpoint is set to Enabled, the navigation, the breaker or
switch selection, as well as the blocking, bypassing and tagging are operational when in
Local mode. When switched to Remote mode, the remote blocking and bypassing will be
operational as well.
The selected component from SLD will be deselected if either the time programmed in
setpoint "Bkr/Sw Select Timeout" expires, or the PB "ESCAPE" is pressed. The "HOME"
button will not de-select the selected object. To navigate to home page, the component
must be first de-selected on the SLD page.
The programmed PBs for breaker or switch Open and Close can be used only in local mode
when an active object is selected in the SLD. The selected device can be opened or closed
provided it is not blocked or tagged. If no operation is detected, the selection is removed,
and the user must press the select PB again to enable the selection. The local mode
breaker selection and operation is only active if the user has proper level security access.
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 4: SETPOINTS