Cewe Prometer 100 - Prefix for Units in the Display; Harmonics Measurement; Thd; Daily Energy Snapshot

Page 38 of 72
Prometer 100 User Manual
BGX501-943-R01
Current Phase angle
Yes (L1, L2, L3)
Yes (L1, L3)
Active power total
Yes
Yes
Active power per phase
Yes
No
Active power fundamental Yes Yes
Active power fundamental per phase
Yes
No
Reactive power total
Yes
Yes
Reactive power per phase
Yes
No
Apparent power total
Yes
Yes
Apparent power per phase
Yes
No
Power factor total Yes Yes
Power factor per phase
Yes
No
Frequency
Yes
Yes
Average THD voltage
Yes
Yes
THD voltage per phase
Yes
No
Average THD current
Yes
Yes
THD current per phase
Yes
No
Average THD power Yes Yes
THD power per phase
Yes
No
7.3.2 Prefix for units in the display
The presentation for units and the number of decimals depends on the magnitude of the value.
7.3.3 Harmonics measurement
Harmonics numbers 2 to 31 are measured for all currents and voltages. At a fundamental frequency of 50 Hz,
the second harmonic is 100 Hz, the third harmonic is 150 Hz, etc. Both the harmonics’ amplitude and phase
angle are measured and included in the calculation of power and energy, and their magnitude can be read via
the meter’s communication protocols. In M-Cubed, harmonic magnitude is presented with a diagram.
Voltage harmonics profile
Parameter
Available on 3-element meter
Available on 2-element meter
Real Time Clock – Date and Time
Yes
Yes
Voltage harmonics (2 to 31) – L1
Yes
Yes
Voltage harmonics (2 to 31) – L2 Yes No
Voltage harmonics (2 to 31) – L3 Yes Yes
Current harmonics profile
Parameter
Available on 3-element meter
Available on 2-element meter
Real Time Clock – Date and Time Yes Yes
Current harmonics (2 to 31) – L1 Yes Yes
Current harmonics (2 to 31) – L2
Yes
No
Current harmonics (2 to 31) – L3
Yes
Yes
7.3.4 THD
THD stands for Total Harmonics Distortion and is a measurement of the amount of harmonics present in a
signal. Voltages and currents’ THD can be read via M-Cubed and on the display.
7.4 Daily Energy Snapshot
Energy Snapshot feature saves the value of a particular energy register at a particular time. Prometer 100
stores a snapshot of different energy registers (can be up to 28 energies) on a daily basis at predefined time as
selected from tariff configuration (generally it is set at midnight). Snap shots are generally stored for 45 days
and can be stored for a maximum of 100 days as configured at factory. The updating of Energy Snap shot
records is done in a rollover fashion, i.e. each day a new energy snapshot is stored in the memory and the
earliest record is deleted. So at any time a meter will have energy snapshot records for the last 45 days.