SATEC SA300 ezPAC Operation Manual - Manual (Page 100)

Chapter 8 Configuring Recorders Configuring the EN50160 Power Quality Recorder
100 SA300 Substation Automation Unit
Method of Evaluation
The voltage interruption is detected when the voltages on all phases fall below the
interruption threshold (as per IEC 61000-4-30) specified by the EN50160 at a level of
1%Un. The interruption threshold can be changed in the device via the EN50160 PQ
Recorder setup.
The basic voltage measurement is one-cycle RMS voltage updated each half-cycle.
Statistical Survey
The SA300 provides the statistical evaluation of voltage interruptions using the
classification recommended by Eurelectric’s Measurement guide for voltage
characteristics.
Interruptions are classified by duration as shown in Appendix D.
Indicative Values
Under normal operating conditions the expected number of short voltage interruptions
in a year may be from up to a few tens to up to several hundreds. Short interruptions
generally last less than a few seconds.
The annual frequency of long interruptions may be less than 10 or up to 50
depending on the area.
Temporary Overvoltages
Temporary overvoltages are sudden rises of the voltage RMS value of more than
110% of nominal voltage. Temporary overvoltages may last between 10 milliseconds
and one minute.
Method of Evaluation
A temporary overvoltage is classified as one polyphase event regardless of the shape
and of the number of phases affected (as per IEC 61000-4-30). An event can begin
on one phase and end on another phase. The fault magnitude is recorded separately
for each phase involved. The event duration is measured from the instant at which
the voltage rises above the start threshold on one of the phases to that at which it
becomes lower than the end threshold on all affected phases including a threshold
hysteresis.
The overvoltage threshold can be changed in the device via the EN50160 PQ
Recorder setup.
The basic voltage measurement is one-cycle RMS voltage updated each half-cycle.
Statistical Survey
The SA300 provides the statistical evaluation of temporary overvoltages using the
classification recommended by Eurelectric’s Measurement guide for voltage
characteristics. Temporary overvoltages are classified by voltage magnitude and
duration as shown in Appendix D.
Indicative Values
Temporary overvoltages on the low voltage side will generally not exceed 1.5 kV
RMS.
Transient Overvoltages
Transient overvoltages correspond to disturbances of very short duration, lasting
typically less than one half-cycle, i.e. a few microseconds to several milliseconds.
Method of Evaluation
Transient overvoltages are detected as impulsive transients with a rise time less than
0.5 ms and duration from 150 us to ½ cycle. The impulse magnitude is evaluated by
the peak voltage value and is referenced to the nominal peak voltage (1.414 Un). The
device can detect transient overvoltages with a magnitude of up to 700V.