Flexelement Scheme Logic - GE T60 Instruction Manual

5 SETTINGS 5.5 FLEXLOGIC
5
Figure 5–66: FLEXELEMENT SCHEME LOGIC
The setting specifies the first (non-inverted) input to the FlexElement. Zero is assumed as the input if
FLEXELEMENT 1 +IN
this setting is set to "Off". For proper operation of the element at least one input must be selected. Otherwise, the element
will not assert its output operands.
This setting specifies the second (inverted) input to the FlexElement. Zero is assumed as the input if
FLEXELEMENT 1 –IN
this setting is set to "Off". For proper operation of the element at least one input must be selected. Otherwise, the element
will not assert its output operands. This input should be 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 will 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 ele-
FLEXELEMENT 1 INPUT MODE
ment 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 regardless of whether the signal increases of
decreases.
The element responds directly to its operating signal – as defined by the , and
FLEXELEMENT 1 +IN FLEXELEMENT 1 –IN FLEX-
settings – if the setting is set to "Level". The element responds to the
ELEMENT 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 FLEXELE-
and settings specify how the rate of change is derived.
MENT 1 dt UNIT FLEXELEMENT 1 dt
The setting enables the relay to respond to either high or low values of the operating signal. The
FLEXELEMENT 1 DIRECTION
following figure explains the application of the , and
FLEXELEMENT 1 DIRECTION FLEXELEMENT 1 PICKUP FLEXELEMENT 1 HYS-
settings.
TERESIS
GE Multilin T60 Transformer Protection System 5-175