© 2008 Siemens Energy & Automation, Inc. All Rights Reserved
PMCM-9340D-0208 ACCESS 9340 and 9360 Meters
2/2008 Appendix C—EN50160 Evaluation
EN–223
• for systems with no synchronous connection to an interconnected
system (for example, power systems on some islands):
—50 Hz ± 2% during 95% of a week
—50 Hz ± 15% for 100% of the time
NOTE: The same range of percentages are used for 60 Hz
systems.
Supply Voltage Variations
EN50160 states that under normal operating conditions, excluding
situations arising from faults or voltage interruptions
• during each period of one week 95% of the ten minute mean rms
values of the supply voltage shall be within the range of U
n
±10%.
• all ten minute mean rms values of the supply voltage shall be
within the range of U
n
+10% to -15%.
Supply Voltage Unbalance
EN50160 states that under normal operating conditions, during each
period of one week, 95% of the ten minute mean rms values of the
negative phase sequence component of the supply voltage shall be
within the range 0–2% of the positive phase sequence component.
Harmonic Voltage
EN50160 states that under normal operating conditions, during each
period of one week, 95% of the ten minute mean rms values of each
individual harmonic voltage shall be less than or equal to the value
given in Table C–3. Additionally, the THD of the supply voltage shall
be less than 8%.
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