GE D90 Plus - Page 564

554 D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
PHASOR MEASUREMENT UNIT CHAPTER 11: METERING
Function
Range: Enabled, Disabled
Default: Disabled
This setting enables and disables the PMU one-shot feature.
Sequence Number
Range: 0 to nominal frequency – 1, in steps of 1
Default: 1
When the
Device Date and Device Time match the PMU One-Shot Date and PMU One-
Shot Time
, the D90
Plus
compares the present sequence number of the measured
synchrophasors with this setting value. When the two numbers match, the function
saves the actual values as the one-shot actual values. This allows manual read-out of
the synchrophasor values for the pre-set time and pre-set sequence number (via
supported communication protocols, such as Modbus or DNP, and the EnerVista UR
Plus
Setup software).
When the values are saved as one-shot values, the function also asserts a PMU ONE-SHOT
OP metering logic operand. This operand can be configured to drive an output contact
and trigger an external measuring device, such as a digital scope with the intent to
verify the accuracy of the PMU under test.
With reference to the following figure, the PMU one-shot function (when enabled)
controls the following three metering logic operands:
–The PMU ONE-SHOT EXPIRED operand indicates that the one-shot operation has
been executed.
–The PMU ONE-SHOT PENDING operand indicates that the one-shot operation is
pending; that is, the present time is before the scheduled one-shot time.
–The PMU ONE-SHOT OP operand indicates the one-shot operation.
When the PMU one-shot function is disabled, all three operands are de-asserted. The
one-shot function applies to all logical PMUs of a given D90
Plus
relay.
Figure 486: Phasor Measurement Unit one-shot operands
Device Date
Range: date in MM/DD/YYYY format
Default: 01/01/1970
This value reflects the date programmed in the D90
Plus
. This date cannot be modified
from this window.
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