Appendix Een50160 Evaluation And Recording; En50160 Background - Satec expertmeter EM720 Operation Manual

Appendix E EN50160 Evaluation and Recording
Appendix E

EN50160 Background

Compliance Limits
Indicatives Values
EM720 Power Quality and Revenue Meter
EN50160 Evaluation and Recording
The EN50160 European standard "Voltage characteristics of
electricity supplied by public distribution systems" issued by
CENELEC defines the main physical characteristics of electric
energy supplied
distribution systems under normal operating conditions.
The voltage characteristics are evaluated using a statistical
approach. The standard and its referenced publications
specify for each voltage characteristic:
• Method of evaluation
• Integrating interval for a single measurement
• Observation period
• Statistical indication of the probability of not exceeding
a specified limit
• Standard compliance limits or indicative values within
which any customer can expect the voltage
characteristics to remain
For some voltage characteristics, the standard provides
definite limits that can be complied with for most of the time
considering the possibility of relatively rare excursions
beyond these limits. Limits are set with a view to compliance
for a percentage of the observation time, e.g. 95% of the
observations in any period of one week.
The following table gives the characteristics for which definite
limits have been specified by the standard.
Voltage characteristic
Power frequency
Voltage variations (supply
voltage magnitude)
Rapid voltage changes
Flicker (fluctuations of
voltage magnitude)
Voltage unbalance
Harmonic voltage
Interharmonic voltage
Mains signaling voltage
For the remaining characteristics of the voltage, by their
unpredictable nature, the standard gives only indicative
by low and medium
Compliance with stated
limits, % of time
±1% for 95% of a week
±1% for 99.5% of a year
+4/-6% for 100% of time
±10% Un for 95% of time
≤4-5% Un (up to 10% Un)
Plt ≤ 1 for 95% of time
≤2-3% for 95% of time
THD ≤ 8 for 95% of time
To be defined
Within "Meister-curve" for
99% of time
voltage public
Observation
period
Week, year
Week
Day
Week
Week
Week
Week
Day
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