GE D90 Plus Instruction Manual page 389
Line distance protection system
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Also See for D90 Plus:
- Instruction manual (694 pages) ,
- Communications manual (222 pages) ,
- Instruction manual (602 pages)
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CHAPTER 7: PROTECTION
PLUS
D90
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
Set To Preset
Range: any FlexLogic operand or shared operand
Default: OFF
This setting selects an operand used to set the count to the preset value and functions
as follows:
–
The counter is set to the preset value when the counter is enabled and the
operand assigned to the
counter is enabled and the operand assigned to the
the counter is set to 0.
–
The counter is set to the preset value when the counter is running and operand
assigned to the
Set To Preset
assigned to the
Set To Preset
running, there is no effect on the count.
–
The counter is set to the preset value when a reset or reset/freeze command is
sent to the counter and the operand assigned to the
1. When a reset or reset/freeze command is sent to the counter and the operand
assigned to the
Set To Preset
Reset
Range: any FlexLogic operand or shared operand
Default: OFF
This setting selects an operand for setting the count to either 0 or the preset value
depending on the state of the operand assigned to the
Freeze/Reset
Range: any FlexLogic operand or shared operand
Default: OFF
This setting selects an operand for capturing (freezing) the accumulated count value into
a separate register with the date and time of the operation, and resetting the count to 0.
Freeze/Count
Range: any FlexLogic operand or shared operand
Default: OFF
This setting selects an operand for capturing (freezing) the accumulated count value into
a separate register with the date and time of the operation, and for continuing counting.
The present accumulated value and captured frozen value with the associated date and
time stamp are available as actual values. If control power is interrupted, the
accumulated and frozen values are saved into non-volatile memory during the power
down operation.
The figure shows the digital counter logic. The logic is identical for all digital counters.
setting is asserted (logic 1). When the
Set To Preset
setting changes the state from 0 to 1. If the operand
setting changes from 1 to 0 while the counter is
setting is logic 0, the counter is set to 0.
Set To Preset
CONTROL ELEMENTS
value is logic 0,
Set To Preset
setting is logic
Set To Preset
setting.
379
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