E-Mon E-PS-S-HV-RTU - Manual (Page 226)

Appendix F EN50160 Evaluation and Recording
226 PowerSmart Socket Power Quality Meter
becomes lower than the end threshold on all affected phases
including a threshold hysteresis.
The overvoltage threshold can be changed in the meter via
the EN50160 PQ Recorder setup.
The basic voltage measurement is one-cycle RMS voltage
updated each half-cycle.
Statistical Survey
The PowerSmart Socket PQM 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 E.
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 or low
frequency oscillatory transients with a rise time less than 0.5
ms and duration from 20 us with the Fast Transient
coprocessor option or from 75 us without it and to ½ cycle.
The impulse magnitude is evaluated either by the peak
voltage value, or by the impulse amplitude, and is referenced
to the nominal voltage amplitude (1.414 Un). The meter can
detect transient overvoltages with a magnitude of up to 2 kV
with the fast transient coprocessor option or up to 700V
without it.
Statistical Survey
The PowerSmart Socket PQM provides the statistical
evaluation of transient overvoltages using the classification
recommended by Eurelectric’s Measurement guide for voltage
characteristics. Transient overvoltages are classified by
voltage magnitude as shown in Appendix E.
Indicative Values
Transient overvoltages in LV systems will generally not
exceed 6 kV peak, but higher values occur occasionally.