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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Procedure for <strong>Insulation</strong> <strong>Coord<strong>in</strong>ation</strong> <strong>in</strong> Four Steps<br />
Fachgebiet<br />
Hochspannungstechnik<br />
Determ<strong>in</strong>ation of the coord<strong>in</strong>ation withst<strong>and</strong> voltages U cw<br />
• The coord<strong>in</strong>ation withst<strong>and</strong> voltages are the lowest values of withst<strong>and</strong> voltages of<br />
each overvoltage class, for which the expected low failure rate of the equipment is not<br />
exceeded over its full lifetime.<br />
• Derived from the representative overvoltages U rp by the coord<strong>in</strong>ation factor K c.<br />
<strong>Overvoltage</strong> <strong>Protection</strong> <strong>and</strong> <strong>Insulation</strong> <strong>Coord<strong>in</strong>ation</strong> / Chapter 1 - 32 -<br />
Typical for<br />
Germany:<br />
0.1% per year<br />
� 1 failure <strong>in</strong><br />
1000 years<br />
[IEC 60071-1]
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