GE D90 Plus Instruction Manual page 564

PHASOR MEASUREMENT UNIT
554
Function
Range: Enabled, Disabled
Default: Disabled
This setting enables and disables the phasor measurement unit one-shot feature.
Sequence Number
Range: 0 to nominal frequency – 1, in steps of 1
Default: 1
When the and
Device Date
Plus
, the D90 compares the present sequence number of the measured
Shot Time
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
Setup software).
When the values are saved as one-shot values, the function also asserts a
metering logic operand. This operand may be configured to drive an output contact
OP
and trigger an external measuring device such as a digital scope with the intent to verify
the accuracy of the phasor measurement unit under test.
With reference to the figure below, the phasor measurement unit one-shot function
(when enabled) controls three metering logic operands.
– The
PMU ONE-SHOT EXPIRED
been executed.
– The
PMU ONE-SHOT PENDING
pending; that is, the present time is before the scheduled one-shot time.
– The
PMU ONE-SHOT OP
When the phasor measurement unit one-shot function is disabled, all three operands
are de-asserted. The one-shot function applies to all logical phasor measurement units
Plus
of a given D90 relay.
Figure 483: 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
from this window.
match the
Device Time PMU One-Shot Date
operand indicates that the one-shot operation has
operand indicates that the one-shot operation is
operand indicates the one-shot operation.
Plus
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 11: METERING
and
PMU One-
PMU ONE-SHOT
. This date cannot be modified
Plus