Flex State - GE 845 Instruction Manual

DEVICE

Flex State

4–70
• Pre-fault values for all programmed analog channels (one cycle before pre-fault
trigger)
• Fault values of all programmed analog channels (one cycle after the fault trigger)
The trigger can be any FlexLogic™ operand, but in most applications it is expected to be
the same operand, usually a virtual output, that is used to drive an output relay to trip a
breaker. A FAULT RPT TRIG event is automatically created when the report is triggered.
If a number of protection elements, such as overcurrent elements, are "OR'd" to create a
fault report trigger, the first operation of any element causing the OR gate output to
become high triggers the fault report. However, If other elements operate during the fault
and the first operated element has not been reset (the OR gate output is still high), the fault
report is not triggered again. Considering the reset time of protection elements, there is
very little chance that fault report can be triggered twice in this manner. As the fault report
must capture a usable amount of pre and post-fault data, it cannot be triggered faster
than every 20 ms.
The fault report stores data, in non-volatile memory, pertinent to an event when triggered.
Each fault report is stored as a file to a maximum capacity of fifteen (15) files. A sixteenth
(16th) trigger overwrites the oldest file.
The EnerVista 8 Series Setup software is required to view all captured data. The relay
faceplate display can be used to view the date and time of trigger, the fault type and the
distance location of the fault.
Path:
Setpoints > Device > Fault Report
FUNCTION
Range: Disabled, Enabled
Default: Disabled
PRE-FAULT TRIGGER
Range: Off, Any operand from the list of FlexLogic operands
Default: Off
This setpoint specifies the FlexLogic™ operand to capture the pre-fault data. The rising
edge of this operand stores one cycle-old data for subsequent reporting. The element
waits for the fault trigger to actually create a record as long as the operand selected as
PRE-FAULT TRIGGER is "On". If the operand remains "Off" for 1 second, the element resets
and no record is created.
FAULT TRIGGER
Range: Off, Any operand from the list of FlexLogic operands
Default: Off
This setpoint specifies the FlexLogic™ operand to capture the fault data. The rising edge
of this operand stores the data as fault data and results in a new report. The trigger (not
the pre-fault trigger) controls the date and time of the report. The distance to fault
calculations are initiated by this signal.
ANALOG CHANNELS 1 to 32
These settings specify an actual value such as voltage or current magnitude, true RMS,
phase angle, frequency, temperature, etc., to be stored should the report be created. Up
to 32 analog channels can be configured.
Path:
Setpoints > Device > Flex States
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 4: SETPOINTS