C03D Group. Magnetic Fields of Underground Cables. 10/24/2011 ICC Fall 2011 Meeting, Denver 24 October - 1 -

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1 C03D Group Magnetic Fields of Underground Cables Jicable'11 Digest of Papers about EMF Frédéric LESUR 10/24/2011 ICC Fall 2011 Meeting, Denver 24 October - 1 -

2 Impact of electromagnetic fields on current ratings and cable systems Paper B1.1 (EMF: Electric and magnetic fields) Harry ORTON, Paolo MAIOLI, Heiner BRAKELMANN, Jarle BREMNES, Frédéric LESUR, Josu ORELLA SAENZ, Jacco SMIT Results of the Cigré WG B1.23 EMF impact on current rating and cable systems EMF mitigation techniques Conductor management Passive loops Metallic plates Ferromagnetic raceways and steel pipes Current derating principles EMF mitigation additional losses! 10/24/2011 ICC Fall 2011 Meeting, Denver 24 October - 2 -

3 Ampacity derating effects of magnetic field management techniques used with underground transmission cables Paper B1.5 (EMF: Electric and magnetic fields) John COOPER, David FUGATE, Tiebin ZHAO EMF Management methods Geometry Compensation loops Shielding with high conductivity / ferromagnetic permeability materials Practical applications of current derating 10/24/2011 ICC Fall 2011 Meeting, Denver 24 October - 3 -

4 HVAC-cable with ferromagnetic sheathings Paper A4.2 (HV System Design EMF) Heinrich BRAKELMANN, Jan BRÜGGMANN, Jörg STAMMEN, Jacco SMIT, Volker WASCHK Evaluation of two shielding techniques Steel pipes µ r highly dependant of the magnetic field applied Conductor and metallic screens losses are influenced + hysteresis Ferromagnetic permeable tapes Detailed in the B1.3 Paper Shielding factor Evaluated as a function of current, spacing between conductors, steel wall thickness Measurement and numerical analysis Case configuration in Amsterdam Losses must be analyzed carefully! 10/24/2011 ICC Fall 2011 Meeting, Denver 24 October - 4 -

5 SC-IES cables Single core cables with integrated electromagnetic shielding Paper B1.3 (EMF: Electric and magnetic fields) Heinrich BRAKELMANN, Jan BRÜGGMANN, Volker WASCHK Special design coaxial Copper screens Ferromagnetic high permeable tapes Solidly bonded (both ends) Return currents generating a compensating magnetic field Excellent shielding factor Ampacity in the range of that of conventional cables Additional losses of return currents But comparable with losses of ferromagnetic for single core cables 10/24/2011 ICC Fall 2011 Meeting, Denver 24 October - 5 -

6 EMF conductor management of underground cable systems Paper B1.2 (EMF: Electric and magnetic fields) Frédéric LESUR Play on the geometry or phase arrangement of conductors Influent parameters Comparative studies Practical configurations Magnetic field above a joint bay Multiple circuits Phase splitting Multiple duct banks HVDC systems 10/24/2011 ICC Fall 2011 Meeting, Denver 24 October - 6 -

7 Shielding of the electromagnetic field generated by HV underground cable lines Paper B1.4 (EMF: Electric and magnetic fields) Paolo MAIOLI Passive loops for joint bays Optimization of geometry Thermal influence Ferromagnetic raceways or boxes Resistance of steel to corrosion Transition points Measurements and calculations 10/24/2011 ICC Fall 2011 Meeting, Denver 24 October - 7 -

8 Magnetic mitigation of HV junction zone Paper B1.6 (EMF: Electric and magnetic fields) Aldo CANOVA, Luca GIACCONE Innovative passive coupling loop Introduction of magnetic cores to improve the induction between power cables and the shielding passive loop Careful design to avoid saturation 10/24/2011 ICC Fall 2011 Meeting, Denver 24 October - 8 -

9 Investigations into the design of EMF mitigations techniques Paper B10.2 (Design) Matthieu CABAU, Nadja MARAZANOF, Frédéric LESUR, Nathalie BOUDINET Experience within the French TSO of investigating mitigation techniques Conductor management Passive loops Steel pipes (bridge corbelling) Influent parameters (pipe thickness and diameter, magnetic permeability, conductivity) 10/24/2011 ICC Fall 2011 Meeting, Denver 24 October - 9 -

10 EMF mitigation using steel pipes effect on cable thermal rating Paper E (HV and EHV Cable systems and design) Thierry BOUCHER, Eric DORISON Analytical developments to access magnetic fields and losses in steel structures Very complex solutions! Pipes U-shape shieldings Rectangular casings Comparison with FEM calculations Very good accordance 10/24/2011 ICC Fall 2011 Meeting, Denver 24 October

11 Evaluation of the magnetic induction on metal pipelines by AC power cable circuits Paper B2.4 (Environmental subjects EMF and others) LIU Ying, LIU Ming, CAO Xiaolong, XU Yang, HAN Xiaopeng, ZHAO Rui 10/24/2011 ICC Fall 2011 Meeting, Denver 24 October

12 Power frequency magnetic field test and analyse of HV cables in tunnel Paper E (Cable systems and testing) LI Huachun 10/24/2011 ICC Fall 2011 Meeting, Denver 24 October

13 For further information Jicable website 10/24/2011 ICC Fall 2011 Meeting, Denver 24 October