Control Elements - GE D90 Plus Instruction Manual

CONTROL ELEMENTS

Control elements
248
In this equation, m is a multiplier defined by the multiplier setting, S
pickup setting, and S represents the operating power at the time. This timer starts after
op
the definite time timer expires.
The four FlexCurves allow for custom user-programmable time characteristics. When
working with FlexCurves, the element uses the operate to pickup ratio, and the multiplier
setting is not applied:
Again, the FlexCurve timer starts after the definite time timer expires.
Multiplier
Range: 0.01 to 2.00 seconds in steps of 0.01
Default: 1.00 seconds
This setting is applicable if the wattmetric
multiplier factor for the inverse time delay.
Block
Range: any FlexLogic™ operand
Default: Off
Assertion of the FlexLogic™ operand assigned to this setting blocks operation of the
wattmetric zero-sequence directional ground fault element.
Events
Range: Enabled, Disabled
Default: Disabled
This setting enables and disables the logging of wattmetric zero-sequence directional
ground fault events in the sequence of events recorder.
The logic for the wattmetric zero-sequence directional ground fault 1 element is shown
below. The logic is identical for both wattmetric elements.
Figure 199: Wattmetric zero-sequence directional ground fault logic
Control elements are generally used for control rather than protection.
setting is "Inverse" and defines the
Curve
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 7: PROTECTION
represents the
ref
Eq. 37