Draft Guide for Harmonic Limits for Single-Phase Equipment


Table 6-2. Fundamental Differences in Distribution Design between European and U.S. Distribution Systems



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Table 6-2. Fundamental Differences in Distribution Design between European and U.S. Distribution Systems
















Standard Design Practice

Comments




United States

Europe
















Transformers










Connection

wye wye

delta wye

US is limited by 3rd, Europe by 5th

number of phases

mostly 1, some 3

3

US single-phase is connected phase-to-neutral

kVA rating

50

500 or 1000




number of customers

6-10

60-100




equivalent impedance to transf. sec.

higher

lower

point of common coupling issue













main feeder or circuit










kV phase to phase

12.5

11 or 12

not much difference

number of conductors

4

3

neutral (US) is ampacity limited by primarily 3rd, also stray voltage possibility













customer services










service voltage

120/240 V

230 V

need to address both 120 V limits as well as 240 V limits w US

number of wires

3

2

Europe just has 230 V limit

equivalent impedance to customer

lower

higher

point of use




















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This is an unapproved IEEE Standards Draft, subject to change.



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