GE 845 - Page 131

CHAPTER 4: SETPOINTS SETPOINTS MAIN MENU
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL 4–3
• 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.
NOTE
NOTE:
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:
PATH: SETPOINTS > SYSTEM > BREAKER 1 (2, 3)
From these screens, Relay 1, Relay 2, and Relay 9 are selected as default outputs for
tripping Breaker 1, Breaker 2, and Breaker 3 respectively. Output relays for closing the
breakers are not selected. The user can program any output relay from the list of output
relays for breaker tripping, or closing.
PROTECTION ELEMENT TRIP SELECTIONS
Selective tripping of the transformer breakers from the protection element can be
programmed from two places:
• From the Relay HMI: Protection Element Menu
•From the 845 PC program: Element’s Menu or Protection Summary
From the Relay HMI: Protection Element Menu
If Trip is selected as a “Function” for an element, and upon operation of that element, the
LED “TRIP” will turn on. Similarly when Alarm, or Latched Alarm is selected, upon element
operation, the LED “ALARM” will turn on. Selecting the “Configurable” setting is not
associated with an LED.
Example 1: Programming an IOC1 element as a Trip function
1. Select Trip from the list of selections available for the setpoint “Function”
2. Select the output relays for tripping the breakers, and any other aux relays if
necessary.