GE D90 Plus Instruction Manual page 349

CHAPTER 7: PROTECTION
Contact input chatter detection
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
Nominal Voltage
Range: 24 to 250 volts in steps of 1
Default: 125 volts
This setting specifies the range required to validate a closed contact input. This range is
fixed at 70 to 130% of this setting value, with an absolute minimum of 20 volts and an
absolute maximum of 285 volts.
Table 21: Nominal voltage setting for typical battery voltages
Nominal voltage
24 V
48 V
125 V
250 V
Events
Range: Enabled, Disabled
Default: Disabled
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:
• FlexLogic™ 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 278: Chatter detection example
Select the Settings > Protection > Protection Inputs/Outputs > Contact Inputs > Chatter
Detection menu item to access the contact input chatter detection settings.
PROTECTION INPUTS AND OUTPUTS
Validation threshold
20 V
33.6 V
87.5 V
175 V
operand is
CONTACT INPUT TROUBLE
341