GE P24DM Technical Manual Download

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Measurement Mode

Parameter

Signing

Export Power
Import Power
Lagging Vars
Leading VArs

–
+
–
+

The device also calculates the per-phase and three-phase power factors.

These power values increment the total real and total reactive energy measurements. Separate energy
measurements are maintained for the total exported and imported energy. The energy measurements are
incremented up to maximum values of 1000 GWhr or 1000 GVARhr at which point they reset to zero. It is possible
to reset these values using the menu or remote interfaces using the Reset demand cell.

These measurements are contained in the MEASUREMENTS 2 column.

4.1.4

DEMAND VALUES

The device produces fixed, rolling, and peak demand values. You reset these quantities using the Reset demand
cell.

The fixed demand value is the average value of a quantity over the specified interval. Values are produced for
three phase real and reactive power. The fixed demand values displayed are those for the previous interval. The
values are updated at the end of the fixed demand period according to the Fix Dem Period setting in the
MEASURE'T SETUP column.

The rolling demand values are similar to the fixed demand values, but a sliding window is used. The rolling demand
window consists of a number of smaller sub-periods. The resolution of the sliding window is the sub-period length,
with the displayed values being updated at the end of each of the sub-periods according to the Roll Sub Period
setting in the MEASURE'T SETUP column.

Peak demand values are produced for each phase current and the real and reactive power quantities. These
display the maximum value of the measured quantity since the last reset of the demand values.

These measurements are contained in the MEASUREMENTS 2 column.

Note:
A Reset Demand opto-input DDB signal is available.

4.1.5

FREQUENCY MEASUREMENTS

The device produces a range of frequency statistics and measurements relating to the Frequency Protection
function. These include Check synchronisation and Slip frequency measurements found in the MEASUREMENTS 1
column, Rate of Change of Frequency measurements found in the MEASUREMENTS 3 column, and Frequency
Protection statistics found in the FREQUENCY STAT. column.

The device produces the slip frequency measurement by measuring the rate of change of phase angle between
the bus and line voltages, over a one-cycle period. The slip frequency measurement assumes the bus voltage to be
the reference phasor.

4.1.6

OTHER MEASUREMENTS

Depending on the model, the device produces a range of other measurements such as thermal measurements.

These measurements are contained in the MEASUREMENTS 3 column.

4.2

MEASUREMENT SETUP

You can define the way measurements are set up and displayed using the MEASURE'T SETUP column and the
measurements are shown in the relevant MEASUREMENTS tables.

GE P24DM, Technical Manual

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