Setpoints Setpoints Main Menu; Protection And Trip Breaker Selection - GE 845 Instruction Manual

SETPOINTS MAIN MENU

Protection and Trip Breaker Selection

NOTE:
4–2
Figure 4-2: Main Setpoints Screen
Depending on order code, the 845 relay provides protection for either two-winding, or
three-winding transformers. Based on this, either two or three breakers can be configured
for status monitoring, tripping and closing. Each breaker menu provides a selection of trip
output and/or close output relay. Depending on the selected output relays, and the
function setting for the protection, control and monitoring elements, some conditions
apply.
• All ouputs selected for "BKR # Trip Output Select" under Breaker setup menu are
available for selection in the menus of all elements, except in the outputs selection for
"BKR# Close Output Select".
• For all elements, the default value for the trip selected outputs under Breaker setup
shows "Do Not Operate". The user can select these relays from the menu of the
element.
• All outputs selected for "BKR# Close Output Select", are automatically excluded from
the list of outputs available under the menus of all elements including the list of output
selection for "BKR# Trip Output Select setpoint. The close output relays can be used for
closing the breakers Remotely or Locally as part of teh Breaker Control feature.
• By default the form-A circuit monitoring outputs Aux Relay 1 is selected for tripping
Breaker 1, Aux Relay 2 is selected for tripping Breaker 2, and Aux Relay 9 for tripping
Breaker 3. Outputs for closing of the breakers are not selected.
If the output selected under "BKR # Close Breaker Select" is replaced by another output,
the old output which is no longer used for closing, will automatically show up in the menu
of the elements with the default value "Do Not Operate". The newly selected output is
automatically excluded from the list of outputs for selection under all element menus.
When excluded from the list of outputs for element menus, the output is inactive for any
element.
Programming Output Relays for breaker tripping and closing the breakers
The programming of the output relays for tripping individual breakers is performed once,
when selected under setpoint BKR 1(2,3) Trip Relay Select, and BKR 1(2,3) Close Relay
Select from the Setpoints/System/Breakers/Breaker 1(2,3) menu as shown:
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 4: SETPOINTS