PowerLogic™ PM5100 series user guide | Chapter |
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Chapter 8—Measurements and calculations
This section describes how the meter processes measured and calculated data.
Real-time readings
The power and energy meter measures currents and voltages, and reports in real time the RMS (Root Mean Squared) values for all three phases and neutral. The voltage and current inputs are continuously monitored at a sampling rate of 64 points per cycle. This amount of resolution helps enable the meter to provide reliable measurements and calculated electrical values for various commercial, buildings and industrial applications.
Related topics
•To learn how to navigate to the data screens using the front panel, see “Viewing Meter Data” on page 43.
Energy
The power and energy meter calculates and stores accumulated energy values for real, reactive, and apparent energy.
You can view accumulated energy from the display. The energy value units automatically change, based on the quantity of energy accumulated (e.g., from kWh to MWh, from MWh to GWh, then from GWh to TWh, from TWh to PWh).
Related topics
•To view energy readings from the front panel display, see “Meter data display screens” on page 43.
Min/max values
The meter’s
Power factor
Power factor (PF) is the ratio of active power (P) to apparent power (S), and is a number between zero (0) and one (1). In a purely resistive circuit, PF is equal to 1 (unity PF). Inductive or capacitive loads increase the reactive power (Q) component in the circuit which causes the PF to become less than 1.
Power factor can have a positive or negative sign, depending on the type of load or direction of power flow. See “Power factor sign convention” on page 62.
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