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
Содержание RPV311
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Страница 107: ...RPV311 Chapter 5 Operation RPV311 TM EN 7 107 Figure 51 Circuit and channel settings monitoring sequence ...
Страница 108: ...Chapter 5 Operation RPV311 108 RPV311 TM EN 7 Figure 52 Relays PMU and MODBUS settings monitoring sequence ...
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Страница 275: ...Chapter 17 Technical Specifications RPV311 RPV311 TM EN 7 275 Figure 143 RA331 RA332 and RA333 dimensions ...
Страница 279: ...RPV311 Appendix A Equipment Log RPV311 TM EN 7 279 ...