Standard EN 50160: Voltage Characteristics in Public Distribution Systems
By Antoni Klajn / Published on Wed, 2008-12-03 10:58
The EN 50160 standard defines the Voltage characteristic of electricity supplied by public supply networks. The standard is written in statistical terms, setting limits for various parameters that should be achieved for 95 % of the time. This Application Note discusses the standard, implications for users and methods of measurement for compliance. The standard serves as a benchmark but that does not mean that an installation supplied from a complianr network will be free of PQ issues.
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EN 50160 standard does not define any voltage characteristics
By Stefan Fassbinder / Published on Fri, 2009-04-10 17:38except for the voltage tolerances.
All of the rest consists of very general descriptions like:
Under normal operating conditions the number of voltage dips lies between some tens and several thousands per year.
They usually last less than 1 s and have a retained voltage of over 40%.
Under normal operating conditions rapid voltage changes usually remain below 5% of the rated voltage, but deviations of up to 10% may under certain circumstances occur several times a day.
Short interruptions of up to 3 minutes occur some tens up to several hundred times a year. Up to 70% of these may last for less than 1 s.
Switching transients usually do not exceed 1.5 kV, other transients commonly stay below 6 kV. In individual cases, however, they may be higher than that.
Unbalance: 95% of all 10-minute mean values must have an inverse system of less than 2% the direct system. But where there are many singe- and two-phase loads in operation, it may as well give rise up to 3%.
The frequency should be between 49.5 Hz and 50.5 Hz for at least 99.5% of a given year.
Island networks not running synchronous to the UCTE mains are exempted from this. So this already starts with the British isles (see www.ucte.org).
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