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Chapter 9
– TW Fault Locator
RPV311
150
RPV311-TM-EN-7
Figure 76 - TW Fault Location example 2
6
TWFL in Mixed (Hybrid) Lines
A hybrid transmission line is comprised of two or more different line types. That
matters for the TWFL because the velocity of the fault wave is different in each
section of the line and that shall be taken into account during the fault distance
calculations.
The wave velocity is related to the relative permittivity of the main insulation and
different thicknesses of the semi-conducting layers. Assuming one constant wave
velocity for such a line will result in errors.
6.1
K Factor Calculation – Overhead Section
In the case of K factor relating to overhead line, without insulating material, it is
considered that the dielectric material insulating the cable is only the air. In this case,
the constant of permeability and permittivity is very close to 1.0.
𝜇
𝑟
𝑎𝑖𝑟
≅ 1
𝜖
𝑟
𝑎𝑖𝑟
≅ 1
Summary of Contents for RPV311
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Page 101: ...RPV311 Chapter 5 Operation RPV311 TM EN 7 101 Figure 47 Monitoring sequence ...
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Page 149: ...RPV311 Chapter 9 TW Fault Locator RPV311 TM EN 7 149 Figure 75 TW Fault Location example 1 ...
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Page 265: ...Chapter 17 Technical Specifications RPV311 RPV311 TM EN 7 265 Figure 142 RPV311 Dimensions ...
Page 279: ...RPV311 Appendix A Equipment Log RPV311 TM EN 7 279 ...