Non-Volatile Latches - GE D90 Plus Instruction Manual

CHAPTER 7: PROTECTION

Non-volatile latches

PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
Dropout Delay
Range: 0 to 3600000000 ms in steps of 1
Default: 0
This setting specifies the time delay to dropout. If a dropout delay is not required, set this
value to "0".
The non-volatile latches provide a permanent logical flag that is stored safely and will not
reset upon reboot after the relay is powered down. Typical applications include sustaining
operator commands or permanently block relay functions, such as autoreclose, until a
deliberate interface action resets the latch. There are 16 non-volatile latches available for
use in protection schemes.
Select the Settings > Protection > Protection FlexLogic > Non-Volatile Latches menu
item to open the non-volatile latches configuration window.
Figure 288: Non-volatile latches configuration settings
The following settings are available for the protection non-volatile latches.
Function
Range: Enabled, Disabled
Default: Disabled
This setting enables and disables the corresponding protection non-volatile latch.
Type
Range: Reset Dominant, Set Dominant
Default: Reset Dominant
This setting selects the non-volatile latch as set-dominant or reset-dominant.
Set
Range: any FlexLogic™ operand or shared operand
Default: OFF
If the operand assigned to this setting is asserted, the non-volatile latch will be set.
Reset
Range: any FlexLogic™ operand or shared operand
Default: OFF
If the operand assigned to this setting is asserted, the non-volatile latch will be reset.
Events
Range: Enabled, Disabled
Default: Disabled
This setting enables and disables the logging of non-volatile latch events in the
sequence of events recorder.
The following table summarizes the operation of the non-volatile latches.
PROTECTION FLEXLOGIC™
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