Overvoltage Protection and Insulation Coordination in Power Systems
Overvoltage Protection and Insulation Coordination in Power Systems
Overvoltage Protection and Insulation Coordination in Power Systems
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<strong>Insulation</strong> <strong>Coord<strong>in</strong>ation</strong> - Pr<strong>in</strong>ciples<br />
• Voltages of the system<br />
– Nom<strong>in</strong>al voltage U n<br />
» rounded value for characteriz<strong>in</strong>g the system<br />
Fachgebiet<br />
Hochspannungstechnik<br />
» 10 kV - 20 kV - 110 kV - 220 kV - 380 kV<br />
– System voltage<br />
» voltage at which the system is be<strong>in</strong>g operated<br />
» around the nom<strong>in</strong>al value, but not constant<br />
– Highest system voltage U s<br />
» highest operat<strong>in</strong>g voltage between phases under normal conditions<br />
» 12 kV - 24 kV - 123 kV - 245 kV - 420 kV (IEC 60038)<br />
• Voltages of equipment<br />
– Highest voltage for equipment U m<br />
» highest voltage between phases for which the <strong>in</strong>sulation is designed<br />
» 12 kV - 24 kV - 123 kV - 245 kV - 420 kV (IEC 60071-1)<br />
<strong>Overvoltage</strong> <strong>Protection</strong> <strong>and</strong> <strong>Insulation</strong> <strong>Coord<strong>in</strong>ation</strong> / Chapter 1 - 16 -
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