GE D90 Plus Instruction Manual page 244

GROUPED PROTECTION ELEMENTS
234
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.
The logic for the phase time overcurrent 1 element is shown below. The logic is identical for
all phase instantaneous overcurrent elements.
-series model; refer to the EnerVista UR
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 7: PROTECTION
Plus
Setup software