GE D90 Plus Instruction Manual page 420

AUTOMATION INPUTS AND OUTPUTS
Contact input chatter detection
412
Table 32: Nominal voltage setting for typical battery voltages
Nominal voltage
24 V
48 V
125 V
250 V
Events
Range: Enabled, Disabled
Default: Enabled
If this setting is "Enabled", every change in the contact input state will trigger an event in
the sequence of events recorder.
Plus
The D90 has a chatter detection feature. When enabled, the IED monitors the number
of state changes that occur within a set duration. If this value exceeds a set value, then a
trouble condition is declared for the input and the
asserted.
The input trouble alarm impacts relay functionality as follows:
• Automation logic operands: operand state will be blocked.
• DNP 3.0 communications: reporting of the input is blocked.
• IEC 60870-5-104 communications: reporting of the input is blocked.
• IEC 61850 GSSE and IEC 61850 GOOSE: reporting of the input is blocked.
• Sequence of events recorder: reporting of the input is blocked.
The trouble condition resets if the input undergoes no state changes for a duration equal
to twice the chatter time setting.
Figure 333: Chatter detection example
Select the Settings > Automation > Automation Inputs/Outputs > Contact Inputs >
Chatter Detection menu item to access the contact input chatter detection settings.
Figure 334: Contact input chatter detection configuration
Validation threshold
20 V
33.6 V
87.5 V
175 V
CONTACT INPUT TROUBLE
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 8: AUTOMATION
operand is