CIRED 2003 - Round Table on Magnetic Field Mitigation Techniques

In this contribution several topics concerning magneticfields and overhead medium voltage power lines arereviewed: simple formulation to assess the magnetic field(MF) level; characterization of magnetic fields generated bytypical three-phase and one-phase primary distribution lines,with balanced and unbalanced current; and main mitigationtechniques, analysed in relation with typical reduction levelobtained. Additional data concerning cost and performanceof different solutions are also provided....
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CIRED 2003 - Round Table on Magnetic Field Mitigation Techniques CIRED 2003 Round Table on Magnetic Field Mitigation Techniques A. Robert (Chairman), J. Hoeffelman (Coordinator), Belgium (alain.robert@elia.be, jean.hoeffelman@elia.be) www.cired-s2.orgCONTENTS PRESENTATIONS...............................................................................................................................................................1 J. Hoeffelman (Belgium), Introduction..............................................................................................................................1 P. Cruz Romero (Spain), Reduction of Magnetic Fields from Overhead Medium Voltage Lines......................................1 M. Chiampi (Italy), Some considerations about passive shielding.....................................................................................6 J. Hoeffelman (Belgium), Shielding of underground power cables, From theory to practical implementation..................8 E. Salinas (GB/SE), Field Mitigation from Secondary Substations..................................................................................14 O. Bottauscio (Italy), Experiences in the mitigation of MV/LV substation magnetic field emissions..............................20 R. Conti (Italy), CESI-ENEL Practical Experience in Reducing 50 Hz Magnetic Fields.................................................22 B. Cestnik (Slovenia), Cases from Slovenian practice for reduction of 50 Hz electric and magnetic fields (high voltage overhead lines and underground cables)..........................................................................................................................26 M. Tartaglia (Italy), Traction Systems: generated magnetic field and its mitigation........................................................28 DISCUSSION (summary by J. Hoeffelman).......................................................................................................................31PRESENTATIONS P. Cruz Romero (Spain), Reduction of Magnetic Fields from OverheadJ. Hoeffelman (Belgium), Introduction Medium Voltage Lines(ELIA, jean.hoeffelman@elia.be) (Universidad de Sevilla, plcruz@us.es) Round Table on Abstract Magnetic Field Mitigation Techniques In this contribution several topics concerning magnetic Chairman: Alain Robert fields and overhead medium voltage power lines are Coordinator: Jean Hoeffelman reviewed: simple formulation to assess the magnetic field1. Reduction of magnetic fields from overhead MV lines (MF) level; characterization of magnetic fields generated by – P. Cruz Romero (ES) typical three-phase and one-phase primary distribution lines,2. Some consideration about passive shielding with balanced and unbalanced current; and main mitigation – M. Chiampi (IT) techniques, analysed in relation with typical reduction level3. Shielding of underground power cables obtained. Additional data concerning cost and performance – J. Hoeffelman (BE) of different solutions are also provided.4. Field mitigation from secondary substations – E. Salinas (SE) Keywords: magnetic field mitigation, primary5. Experiences in the mitigation of MV/LV substation magnetic distribution, compactness, tree wire, super-bundle, low- field emissions – O. Bottauscio (IT) reactance.6. CESI-ENEL practical experience in reducing 50 Hz Magnetic Simplified magnetic field calculation fields – R. Conti (IT) The MF generated by a set of infinitely long, straight7. Cases from Slovenian practices for reduction of 50 Hz EMF conductors can be formulated by a series decomposition of – B. Cestnik (SI) the Biot-Savart Law [1]. For points far from the line8. Traction systems: generated magnetic field and its mitigation (several times the distance between conductors) only the – M. Tartaglia (IT) first non-zero term is needed. For a single-circuit three-phase line with balanced current the resultant magnetic field is given byCI ...