August 2015
Intermediate
550 pages
11h 8m
English
Content preview from Cable System Transients
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Chapter 4Cable Modeling for Transient Simulations
Teruo Ohno1 and Akihiro Ametani2
1Tokyo Electric Power Company, Tokyo, Japan
2Graduate School of Electrical Engineering, Doshisha University, Kyoto, Japan
4.1 Sequence Impedances Using a Lumped PI-circuit Model
Before we discuss the cable modeling for electromagnetic transient (EMT) simulations, we first explain sequence impedances (lumped PI-circuit model) of the cable system used in steady-state [root mean square (RMS) value] simulations. The sequence impedances are important for the transient simulations as the initial conditions are set up based on the result of the RMS simulations.
There are formulas to derive sequence impedances of cables, but it has been common practice to measure the sequence impedances of the cables after installation. This is because it was thought that the existing formulas are not accurate enough to be used for the simulation of important lines. The main reason for this inaccuracy is the fact that the existing formulas do not consider the cable as the cable system, including the sheath bonding.
Recent literature tackled this issue and derived new formulas of sequence impedances of cable systems considering the sheath bonding [1–4]. This section introduces the derivation of these new formulas and compares calculated sequence impedances using these new formulas.
4.1.1 Solidly Bonded Cables
This section derives sequence impedances of solidly bonded cables. We start from the simple one cable case as ...
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