408
D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
PROTECTION FLEXLOGIC™
CHAPTER 7: PROTECTION
Table 28: Non-volatile latch operation table
The logic for protection non-volatile latches is shown below.
Figure 349: Non-volatile latches scheme logic
Protection FlexElements™
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.
Type
Latch operation
Set
Reset
On
Off
Reset-dominant
ON
OFF
ON
OFF
OFF
OFF
Previous state
Previous state
ON
ON
OFF
ON
OFF
ON
OFF
ON
Set-dominant
ON
OFF
ON
OFF
ON
ON
ON
OFF
OFF
OFF
Previous state
Previous state
OFF
ON
OFF
ON
$&'5
6(77,1*
(QDEOHG
'LVDEOHG
)XQFWLRQ
6(77,1*
2II
6HW
6(77,1*
2II
5HVHW
6(77,1*
7\SH
581
6(7
5(6(7
)/(;/2*,&23(5$1'6
/$7&+21
/$7&+2))