GE D90 Plus Instruction Manual page 203
Line distance protection system
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Also See for D90 Plus:
- Instruction manual (694 pages) ,
- Communications manual (222 pages) ,
- Instruction manual (662 pages)
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CHAPTER 7: PROTECTION
PLUS
D90
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
Pickup
Range: 0.000 to 30.000 pu in steps of 0.001
Default: 1.000 pu
This setting specifies the phase time overcurrent pickup level in per-unit values.
Curve
Range: IEEE Mod Inv, IEEE Very Inv, IEEE Ext Inv, IEC Curve A, IEC Curve B, IEC Curve C, IEC
Short Inv, IAC Ext Inv, IAC Very Inv, IAC Inverse, IAC Short Inv, I2t, Definite Time, FlexCurve A,
FlexCurve B, FlexCurve C, FlexCurve D
Default: IEEE Mod Inv
This setting selects the time inverse overcurrent curve style.
TD Multiplier
Range: 0.00 to 600.00 in steps of 0.01
Default: 1.00
This setting specifies a multiple of the base curve shape specified by the
Programming this value to zero results in an instantaneous response to all current levels
above pickup.
Reset
Range: Instantaneous, Timed
Default: Instantaneous
The "Instantaneous" reset method is intended for applications with other relays, such as
most static relays, which set the energy capacity directly to zero when the current falls
below the reset threshold. The "Timed" reset method can be used where the relay must
coordinate with electromechanical relays.
Voltage Restraint
Range: Enabled, Disabled
Default:
This setting enables and disabled the phase time overcurrent voltage restraint feature.
Block A
Range: any FlexLogic™ operand or shared operand
Default: Off
Assertion of the operand assigned to this setting blocks phase A of the phase time
overcurrent element.
Block B
Range: any FlexLogic™ operand or shared operand
Default: Off
Assertion of the operand assigned to this setting blocks phase B of the phase time
overcurrent element.
Block C
Range: any FlexLogic™ operand or shared operand
Default: Off
Assertion of the operand assigned to this setting blocks phase C of the phase time
overcurrent element.
Events
Range: Enabled, Disabled
Plus
Default: varies with UR
This setting enables and disables the logging of phase time overcurrent events in the
sequence of events recorder.
-series model; refer to the EnerVista UR
GROUPED PROTECTION ELEMENTS
setting.
Curve
Plus
Setup software
195
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