janitza UMG 96-S2, Руководство пользователя и технические данные

Страница: 41 / 66

www.janitza.com UMG 96-S2
41
Number of the
harmonics
Phase L3
Current harmonics
Value
Fig. Example display of the 15th harmonics of the current in
the phase L3
Harmonics content THD
The harmonics content THD is the ratio of the
effective value of the harmonics to the effective
value of the mains frequency.
Harmonics content of the current:
Harmonics content of the voltage:
Phase L3
Voltage
Value
Harmonics content
Fig. Example display of harmonics content THD of the
voltage from the phase L3.
12.8.4 Phase sequence
The device presents the phase sequence of the
voltages and the frequency of the phase L1 in
one display.
The phase sequence indicates the phase order in
three-phase networks. Normally a “right rotation
field” exists. The phase order at the voltage
measurement inputs is checked and displayed in
the UMG 96-S2.
The device only determines the phase sequence
if supply voltage and measured voltages are
present.
A movement of the character string on the
display clockwise means a “right rotation field”
and movement counterclockwise means a “left
rotation field”.
The phase sequence is not measured (the
character string in the display is stationary) if
·a phase is missing or
·two identical phases are connected.
Example 1:
Fig. Display of the
mains frequency (50.0 Hz)
and the phase sequence.
Example 2:
Fig. No phase sequence
determined.
12.8.5 Operating hours counter
The operating hours counter measures the
time in which the device records and displays
measured values.
The operating hours time is
·measured with a resolution of 0.1 h.
·displayed in hours.
The operating hours counter cannot be reset.
The device records harmonics
·up to 15 times the mains frequency.
·of the voltage in volts.
·of the currents in amperes.
NOTE
The device only shows harmonics in the
measured value display profile 2 (standard
setting: measured value display 1)! See
also chap. „14. Measured value display and
automatic display change profile“ on page
44.