Inclusion of Wire Twisting Effects in Cable Impedance Calculations
- 25 February 2016
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Power Delivery
- Vol. 31 (6), 2520-2529
- https://doi.org/10.1109/tpwrd.2016.2531125
Abstract
Cable-series impedance modeling is widely applied in electromagnetic transients simulations and power-loss calculations. The calculations are usually performed in a 2-D frame using the finite-element method or alternative approaches, such as MoM-SO, thereby losing the 3-D effects imposed by twisting wire screens and armors. One of the implications of using 2-D modeling for three-core and closely packed single-core cables is that currents will always circulate among the individual wires of each wire screen or armor. However, in the case of twisted screens/armors where the wires are insulated from each other, such current circulation will in reality not exist. As a result, the calculated impedances become incorrect as well as the induced currents and losses on individual conductors. A procedure is introduced for preventing such false current circulations in a 2-D calculation frame by simple manipulation of the system impedance matrix. The approach is demonstrated for the modeling of single-core and three-core cables, with and without external armor. It is shown that the representation of the wire screen/armor armor with respect to current circulations can substantially influence the calculated result, both for the 50/60 Hz impedance and the cable transient behavior. The use of tubular screen representations is also investigated.Keywords
Funding Information
- Aker Solutions
- Nexans Norway
- Norddeutsche Seekabelwerke
- Oceaneering Int.
- Subsea One
- Technip
This publication has 11 references indexed in Scilit:
- Proximity-Aware Calculation of Cable Series Impedance for Systems of Solid and Hollow ConductorsIEEE Transactions on Power Delivery, 2014
- A Finite-Element Approach for Calculating Electrical Parameters of Umbilical CablesIEEE Transactions on Power Delivery, 2009
- A universal model for accurate calculation of electromagnetic transients on overhead lines and underground cablesIEEE Transactions on Power Delivery, 1999
- Transient sheath overvoltages in armoured power cablesIEEE Transactions on Power Delivery, 1996
- Simulation of transient sheath overvoltages in the presence of proximity effectsIEEE Transactions on Power Delivery, 1995
- Simulation of transients in underground cables with frequency-dependent modal transformation matricesIEEE Transactions on Power Delivery, 1988
- Computation of Cable Impedances Based on Subdivision of ConductorsIEEE Transactions on Power Delivery, 1987
- Induced currents and losses in single-core submarine cablesIEEE Transactions on Power Apparatus and Systems, 1976
- Impedance and circulating Current Calculations for UD Multi-Wire Concentric Neutral CircuitsIEEE Transactions on Power Apparatus and Systems, 1972
- The Electromagnetic Theory of Coaxial Transmission Lines and Cylindrical ShieldsBell System Technical Journal, 1934