PD IEC/TR 60865-2:2015

FOREWORD
1 Scope
2 Normative references
3 Symbols and units
4 Example 1 - Mechanical effects on a 10 kV arrangement
   with single rigid conductors
5 Example 2 - Mechanical effects on a 10 kV arrangement
   with multiple rigid conductors
6 Example 3. - Mechanical effects on a high-voltage arrangement
   with rigid conductors
7 Example 4. - Mechanical effects on a 110 kV arrangement
   with slack conductors
8 Example 5. - Mechanical effects on strained conductors
9 Example 6 - Mechanical effects on strained conductors with
   dropper in the middle of the span
10 Example 7 - Mechanical effects on vertical main conductors
   (droppers)
11 Example 8 - Thermal effect on bare conductors
Bibliography

Describes the application of procedures for the calculation of mechanical and thermal effects due to short circuits as presented in IEC 60865-1.

The object of this part of IEC 60865, which is a Technical Report, is to show the application of procedures for the calculation of mechanical and thermal effects due to short circuits as presented in IEC 60865-1. Thus, this technical report is an addition to IEC 60865-1. It does not, however, change the basis for standardized procedures given in that publication. The following points should particularly be noted: The examples in this Technical Report illustrate how to make the calculations according to IEC 60865-1 in a simplified and easy-to-follow manner. They are not intended as a check for computer programs. The numbers in parentheses at the end of the equations refer to the equations in IEC 60865-1:2011. The system voltages are referred to as nominal voltages. The results are rounded to three significant digits. Short-circuit effects appear as exceptional load in addition to the mechanical loads of the normal operation of a switchgear. In the following examples with rigid conductors, a possible static preloading is therefore calculated too. Depending on whether it concerns the load of the normal operation or the load during the short-circuit different safety factors come to use. The height of these factors has been chosen typically and is recommended for the use. However, other safety factors may be necessary depending on the safety concept.