----- Analyzer of power supply quality CAVA-251 / CAVA-252 / CAVA-253 ------- Page No. 8
4.2.3.- Voltage sags
Voltage sags are defined as these cases where the R.M.S. value of a voltage
semicycle is lower a pre-defined voltage value.
The CAVA will inform about the number of semicycles having a R.M.S. value
lower than the preset value that have been detected. The CAVA will also provide the
number of intervals these voltage sags have occurred within.
4.2.4.- Line interruptions
The CAVA is also equipped with a counter to give the number of cycles within
the last period where a voltage dropout has occurred. The CAVA will also provide the
number of intervals these voltage dropouts have occurred within.
Moreover, the CAVA will save into an internal file all above mentioned events,
together with the type and occurrence time of each event.
4.2.5.- Percentage of Voltage Quality
The CAVA provides a value of the percentage of cycles presenting no event
incidence (nor voltage sag neither voltage dropout) referred to the total of cycles
within the set period.
100
period
in the
cycles
of
Total
event
no
wih
cycles
of
No.
Quality
Voltage
×
=
