CHAPTER 7: PROTECTION PROTECTION INPUTS AND OUTPUTS
D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL 391
ID
Range: up to 12 alphanumeric characters
Default: Cont Ip 1
An alphanumeric ID can be assigned to a contact input for diagnostic, setting, and event
recording purposes. The “CONTACT IP 1” text in event records and FlexLogic operands
are replaced by the text programmed in this setting.
Debounce Time
Range: 1.5 to 16.0 ms in steps of 0.25
Default: 2.0 ms
This setting defines the time required for the contact to overcome contact bouncing
conditions. As this time differs for different contact types and manufacturers, program it
as a maximum contact debounce time (per manufacturer specifications) plus additional
margin to ensure proper operation.
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
Events
Range: Enabled, Disabled
Default: Disabled
If this setting is “Enabled,” every change in the contact input state triggers an event in
the event recorder.
Contact input chatter detection
The D90
Plus
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 CONTACT INPUT TROUBLE operand asserts.
The input trouble alarm impacts relay functionality as follows:
• FlexLogic operands: operand state is 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.
Nominal voltage Validation threshold
24 V 20 V
48 V 33.6 V
125 V 87.5 V
250 V 175 V
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