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Additional resources for Power System Engineering: Planning, Design, and Operation of Power Systems and Equipment
Example text
2â•… Medium-Voltage Systems In medium-voltage power systems with Un < 35â•›kV, similar criteria as for lowvoltage systems can be applied. The voltage is regulated by the automatic tapchanger of the feeding transformer. Note that in the medium-voltage power system increases of voltage may have effects on the LV system as well and also have to be considered. The following criteria are recommended: • In medium-voltage systems the voltage is to be kept within a tolerance of ±5% in relation to the nominal system voltage during normal operation.
Note that in the medium-voltage power system increases of voltage may have effects on the LV system as well and also have to be considered. The following criteria are recommended: • In medium-voltage systems the voltage is to be kept within a tolerance of ±5% in relation to the nominal system voltage during normal operation. • With single outage in the medium-voltage system without supply interruptions, the voltage is to be held within a tolerance of ±10% in relation to the nominal system voltage.
3 Nominal system voltages according to IEC 60038 for HVAC-systems, 35â•›kV < Un ≤ 230â•›kV. Highest voltage for equipment, Um (kV) Nominal voltage, Un (kV) Remarks (Table IV of IEC 60038) Remarks Um Not recommended for new installations 123 and 145â•›kV not to be used both in one country. 5 66 69 – 123 110 115 – 145 132 138 – 170 150 245 220 Not recommended for new installations 230 – • No inadmissible frequency fluctuations shall be initiated due to disconnections of loads or due to short-circuits in the power system.