The knowledge about the behavior of cables is substantial in cases of transients or in\ncases of faults. However, there are only a few models that are tailored to the current requirements\nfor calculations of transient phenomena in three-phase cable systems. These models are based on\ncomplex structures. PI-section cable models with simple structures were previously qualified only\nfor calculations in the frequency domain. A new full frequency-dependent cable model to simulate\ntransient phenomena is introduced and validated. The model is based on lumped parameters with\ncascaded frequency-dependent PI-sections. For the implementation and the integration in simulation\ntools, it is important to investigate the impact of the PI-section parameters to the accuracy, the stability\nand the mathematical robustness. In this work, the impact of the frequency dependence of cable\nparameters, the length distribution and the number of PI-sections on the results of the developed\nthree-phase cable model have been discussed. For simulations in the time domain, two algorithms\nhave been presented to optimize the number of PI-sections based on a specified accuracy.
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