Circutor MYeBOX 150, Instruction Manual

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34
MYeBOX 150 - MYeBOX 1500
Instruction Manual

Transients
Transients are detected by checking that the difference between one sample and the next does
not exceed the maximum nominal slope value multiplied by the distortion level coefficient se -
lected by the user (“
6.3.4.- TRANSIENTS, DISTURB”
).
In this case 128 samples are checked per cycle.
The maximum nominal slope value is the maximum tangent value calculated using a nominal
value selected by the user. By definition, in a sine wave this maximum slope is given by the zero
crossing, therefore the maximum slope is calculated as the value of the sine wave between
sample point 0 (zero crossing) and point 1 (first sample).
Transients are checked and saved phase by phase. The 3 voltage phases are checked sepa-
rately and when a transient is detected it saves the 15 wave shape cycles of the variable that
caused it.
Example:
Figure 29
shows the disturbances detected when configuring a distortion coefficient of 5�0
Figure 29: Transients detected with a distortion coefficient of 5.0.
Figure 30
shows the disturbances detected when configuring a distortion coefficient of 90�0