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David MEZERA davidzera@eon.cz

M in i mum short circuit power in the LV distribution network to meet EN 50160 standard requirements. David MEZERA david.mezera@eon.cz Martin KA Š P Í RE K martin.kaspirek@eon.cz E.ON Czech Republic – Czech Republic.

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David MEZERA davidzera@eon.cz

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  1. Minimum short circuit power in the LV distribution network to meet EN 50160 standard requirements David MEZERA david.mezera@eon.cz Martin KAŠPÍREK martin.kaspirek@eon.cz E.ON Czech Republic – Czech Republic

  2. The sources of this survey This investigation was done on the basis of: • 8 years experience of PQ measurement • Evaluated over 3000 measurements PQ in the LV network • The LV network contains of • 18.005 MV/LV distribution substation [piece] • 21.660 LV cable underground line [km] • 17.151 LV overhead line [km] Real LV network was monitored for a long time on 3.000 different PCC

  3. The final result of 3.000 measurements PQ

  4. Who is responsible? • DNO • Pure network=low short circuit power (Sk)? • Badly connected customers? • Customers • Using of nonstandard apparatus? • Electric apparatus?

  5. Minimum short circuit power LV • Thanks to IEC 725 wecan set the reference impedance value, or more precisely, a relative short circuit power value for the LV distribution network and electric equipment of nominal current less than 16/75 A

  6. Relation:short circuit power X PQ

  7. Relation:short circuit power X PQ

  8. Relation:short circuit power X PQ

  9. Relation:short circuit power X PQ

  10. Conclusions for DNO • To connect the new appliances according to Sk in the LV network • To increase Sk above minimum Sk 760 kVA, (900 kVA is recommended for today real used electric appliances) • To increase the cross-section of existing LV overhead lines • To build new MV/LV substations

  11. To increase the cross-section of the existing LV overhead lines To increase the cross-section of the existing LV overhead lines not realizable

  12. To build new MV/LV substations The final calculation is: • 54% new substations. This accounts for a construction of 9723 new substations, including transformers and MV connection with approximate total investment cost of: EUR 280 million.

  13. Conclusion • The pure PQ in LV network is caused by poor conditions on both sides, DNO and customer. • Solution on the side of DNO is calculated on 280million EUR. • Solution on the side of customers ??

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