560 D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
METERED VALUES CHAPTER 11: METERING
High Alarm Pickup, Low Alarm Pickup, High-High Alarm Pickup, Low-Low Alarm Pickup
Range: –90.00 to 90.00 pu in steps of 0.01
Default: 1.00 pu
These settings specify the pickup thresholds for the alarm in per-unit values. A fixed
hysteresis of 3% is applied.
High Alarm Delay, Low Alarm Delay, High-High Alarm Delay, Low-Low Alarm Delay
Range: 1.0 to 300.0 seconds in steps of 0.1
Default: 1.0 seconds
These settings specify the time delays for the four alarm pickup types.
Metered values
This section describes the metered values available for each source. Metered values
presented for each source depend on the phase and auxiliary VTs and phase and ground
CTs assignments for the particular source. For example, if no phase VT is assigned to a
particular source, then no voltage, energy, and power values are available.
The figure illustrates the metering conventions for measuring power and energy
established for use in D90
Plus
devices.
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