ABB IM300-I, Руководство по эксплуатации

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IM300 Intelligent Power Monitoring Instrument
17
3.2.2. Harmonic distortion ratio and harmonic components
In either a single bond display press button display
area harmonic distortion ratio, harmonic components,voltage
/current unbalanced degree and K-factor of current, etc.
In the harmonic content display mode, press button until the
top left of the screen display after the words 'UP', then press
button to scroll upward; press
button until the top left of the
screen display after the words 'DWN', press button to scroll
down.
Screen 1: Display the total harmonic distortion ratio of
3-phase voltage
“H
－
U” displayed at the left top corner of the screen .
When the connection mode is set as 3-phase 4-wire system,
3-phase voltage Ua, Ub, Uc of THD is shown as fig 3.2.10:
THD_Ua
＝
0.6
％；
THD_Ub
＝
0.6
％；
THD_Uc
＝
0.6
％；
When the connection mode is set as 3-phase
3-wire system, 3-phase line voltage Uab, Ubc,
Uca of THD is shown as fig 3.2.11:
THD_Uab
＝
0.6
％；
THD_Ubc
＝
0.6
％；
THD_Uca
＝
0.6
％；
Screen 2: Display the total harmonic distortion ratio of
3-phase current and zero-sequence current.
“H
－
I” displayed at the left top corner of the screen.
The parameters are shown in fig 3.2.12:
THD_Ia
＝
0.6
％；
THD_Ib
＝
0.6
％；
THD_Ic
＝
0.6
％；
THD_In
＝
0.6
％；
Screen 3: Display the odd harmonic distortion ratio of
3-phase voltage
“HUO” displayed at the left top corner of the screen.
when the connection mode is set as 3-phase 4-wire system,
3-phase voltage Ua, Ub, Uc of odd THD is shown
as fig 3.2.13:
THD_O_Ua
＝
0.6
％；
THD_O_Ub
＝
0.6
％；
THD_O_Uc
＝
0.6
％；
when the connection mode is set as 3-phase 3-wire system,
3-phase line voltage Uab, Ubc, Uca of odd THD is shown
in fig 3.2.14:
Fig 3.2.11 THD of 3-phase line
voltage
Fig 3.2.10 THD of 3-phase voltage
Fig 3.2.12 THD of 3-phase current
and zero-sequence current
Fig 3.2.13 Odd THD of 3-phase voltage