GE 845 Instruction Manual page 403

CHAPTER 4: SETPOINTS
NOTE:
NOTE:
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
Figure 4-128: Three winding transformer with HV winding and LV winding
The corresponding transformer SLD is available under the Metering/Summary menu, and
can be selected as a default screen under the Device/Front Panel/Default Screens menu.
The screen is easily accessible by pressing the "Home" pushbutton located on the relay's
front panel.
Once the SLD of the transformer with the associated breakers and CTs is displayed, the
selection of the breaker for Local control can be easily performed.
Pushbutton F1 (Breaker Selector) is a four-position switch used only for breaker selection
when in Local mode. Pressing the "Breaker Selector" pushbutton, highlights Breaker 1 in
yellow. This means, that breaker 1 is selected for Local Open and Close commands from
the relay's Open and Close pushbuttons respectively. Pressing the PB "Breaker Selector"
again, selects Breaker 2, and on the third press selects Breaker 3. If the PB "Breaker
Selector" is pressed after the selection of Breaker 3, none of the breakers are selected. To
select Breaker 1, and subsequently to select Breaker 2 and 3 again, the "Breaker Selector"
PB needs to be pressed again.
If the Breaker Control mode is set to "Remote", the breakers cannot be selected for local
breaker operation. The PBs Open, and Close are not operational.
Figure 4-129: Pressing "Breaker Selector" PB highlights Breaker 1
To operate the pushbuttons, and provide breaker control, the user must be logged in either
as "Operator" or "Administrator".
CONTROL
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