GE D90 Plus Instruction Manual page 398
Line distance protection system
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Also See for D90 Plus:
- Instruction manual (688 pages) ,
- Communications manual (222 pages) ,
- Instruction manual (602 pages)
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PROTECTION INPUTS AND OUTPUTS
Contact input chatter detection
388
ID
Range: up to 12 alphanumeric characters
Default: Cont Ip 1
An alphanumeric ID may be assigned to a contact input for diagnostic, setting, and
event recording purposes. The "CONTACT IP 1" text in event records and FlexLogic™
operands will be 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
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.
Validation threshold
20 V
33.6 V
87.5 V
175 V
CONTACT INPUT TROUBLE
PLUS
D90
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 7: PROTECTION
operand is
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