Schneider Electric PM850, PM870, PM820, PM810 manual Power Analysis Values, Values -3 to Default

63230-500-225A2				PowerLogicTM Series 800 Power Meter
3/2011					Chapter 4—Metering Capabilities
	Table 4–5: Energy-per-shift recorded values
	Quantity	Register Number(s)			Description
					For each shift, enter the minutes from
					midnight at which the shift starts.
		•	1st shift: 16171		Defaults:
	Shift Start Time	•	2nd shift: 16172		1st shift = 420 minutes (7:00 am)
		•	3rd shift: 16173
					2nd shift = 900 minutes (3:00 pm)
					3rd shift = 1380 minutes (11:00 pm)
		•	1st shift: 16174		Enter the cost per kWHr for each shift.
	Cost per kWHr	•	2nd shift: 16175
		•	3rd shift: 16176
					The scale factor multiplied by the
					monetary units to determine the
	Monetary Scale Factor	16177			energy cost.
					Values: -3 to 3
					Default: 0

Power Analysis Values

The power meter provides a number of power analysis values that can be used to detect power quality problems, diagnose wiring problems, and more. Table 4–6 on page 38 summarizes the power analysis values.

•THD. Total Harmonic Distortion (THD) is a quick measure of the total distortion present in a waveform and is the ratio of harmonic content to the fundamental. It provides a general indication of the “quality” of a waveform. THD is calculated for both voltage and current. The power meter uses the following equation to calculate THD, where H is the harmonic distortion:

	2	+	2	+	2	+
H	2		H3		H4
THD =						x 100%

H1

•thd. An alternate method for calculating Total Harmonic Distortion, used widely in Europe. It considers the total harmonic current and the total rms content rather than fundamental content in the calculation. The power meter calculates thd for both voltage and current. The power meter uses the following equation to calculate THD, where H is the harmonic distortion:

	H 2	+ H 2 +	H 2 +
thd =	2	3	4	x 100%

Total rms

•Displacement Power Factor. Power factor (PF) represents the degree to which voltage and current coming into a load are out of phase. Displacement power factor is based on the angle between the fundamental components of current and voltage.

•Harmonic Values. Harmonics can reduce the capacity of the power system. The power meter determines the individual per-phase harmonic magnitudes and angles for all currents and voltages through the:

—31st harmonic (PM810 with PM810Log, and PM820) or

—63rd harmonic (PM850, PM870)

The harmonic magnitudes can be formatted as either a percentage of the fundamental (default), a percentage of the rms value, or the actual rms value. Refer to “Operation with PQ Advanced Enabled” on page 99 for information on how to configure harmonic calculations.

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