9424200996 40-3
BE1-11m Power Quality
Example
Number of integral cycles: 501 cycles over 10 s
Total duration of the 501 cycles: 9.998 s
10-Second Frequency = 501/9.998 = 50.1100 Hz
Distortion
The voltage during a dip is often distorted. This distortion may be important for understanding the effect of
the dip on the system. The BE1-11m calculates distortion using Equation 40-2.
% =
�
2
−
1
2
1
× 100
Equation 40-2. Distortion Calculation
Figure 40-3 illustrates the Power Quality, Distortion screen.
Figure 40-3. Power Quality, Distortion Screen
Dip/Swell
Figure 40-4 illustrates the Power Quality, Dip/Swell screen. A green LED indicates that the threshold
specified in Power Quality Settings has been exceeded.
Figure 40-4. Power Quality, Dip/Swell Screen
Harmonics
Figure 40-5 illustrates the Power Quality, Harmonic Voltage screen. The Harmonic Current screen is
similar.
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