Protection Flexelements - GE D90 Plus Instruction Manual

PROTECTION FLEXLOGIC™

Protection FlexElements™

354
Table 28: Non-volatile latch operation table
Type Latch operation
Set
Reset-dominant ON
OFF
ON
OFF
Set-dominant ON
ON
OFF
OFF
The logic for protection non-volatile latches is shown below.
Figure 289: Non-volatile latches scheme logic
A FlexElement™ is a universal comparator that can be used to monitor any analog actual
value calculated by the relay or a net difference between any two analog actual values of
the same type. The effective operating signal can be treated as a signed number or an
absolute value. The output from a FlexElement™ can also be used for further logic
processing. The number of FlexElements dedicated is 16.
The element can be programmed to respond either to a signal level or to a rate-of-change
(delta) over a pre-defined period of time. The output operand is asserted when the
operating signal is higher than a threshold or lower than a user-specified threshold.
Select the Settings > Protection > Protection FlexLogic > FlexElements menu item to
open the protection FlexElements™ configuration window.
Reset
OFF
OFF
ON
ON
OFF
ON
OFF
ON
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 7: PROTECTION
On Off
ON OFF
Previous state Previous state
OFF ON
OFF ON
ON OFF
ON OFF
Previous state Previous state
OFF ON