GE T35 Instruction Manual page 396

FLEXLOGIC CHAPTER 5: SETTINGS
Figure 5-97: FlexElement logic
— This setting specifies the first (non-inverted) input to the FlexElement. Zero is assumed as the input if
FLEXELEMENT 1 +IN
5
this setting is set to "Off." For proper operation of the element, at least one input must be selected. Otherwise, the element
does not assert its output operands.
— Specifies the second (inverted) input to the FlexElement. Zero is assumed as the input if this setting is
FLEXELEMENT 1 –IN
set to "Off." For proper operation of the element, at least one input must be selected. Otherwise, the element does not
assert its output operands. This input is used to invert the signal if needed for convenience, or to make the element
respond to a differential signal, such as for a top-bottom oil temperature differential alarm. The element does not operate
if the two input signals are of different types, for example if one tries to use active power and phase angle to build the
effective operating signal.
The element responds directly to the differential signal if the setting is set to "Signed" The
FLEXELEMENT 1 INPUT MODE
element responds to the absolute value of the differential signal if this setting is set to "Absolute." Sample applications for
the "Absolute" setting include monitoring the angular difference between two phasors with a symmetrical limit angle in
both directions, monitoring power regardless of its direction, or monitoring a trend.
The element responds directly to its operating signal—as defined by the , and
FLEXELEMENT 1 +IN FLEXELEMENT 1 –IN
settings—if the setting is set to "Level." The element responds to the
FLEXELEMENT 1 INPUT MODE FLEXELEMENT 1 COMP MODE
rate of change of its operating signal if the setting is set to "Delta." In this case, the
FLEXELEMENT 1 COMP MODE
and settings specify how the rate of change is derived.
FLEXELEMENT 1 dt UNIT FLEXELEMENT 1 dt
— Enables the relay to respond to either high or low values of the operating signal. The following
FLEXELEMENT 1 DIRECTION
figure explains the application of the , , and
FLEXELEMENT 1 DIRECTION FLEXELEMENT 1 PICKUP FLEXELEMENT 1 HYSTERESIS
settings.
5-194 T35 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL