Implementation of shielding principles for magnetic field management of power cables

Parametric analysis of magnetic field mitigation shielding for underground power cables

“…One of these PFMFs sources are the high voltage transmission underground cables. Several techniques have been applied in these sources to mitigate the magnetic field that can be classified in two goups: "intrinsic methods", when they act on the laying parameters to reduce the field strength, like phase arrangement, and "external shielding techniques", when special apparatuses external to the cable are used, such as grids of insulated conductors and shields made of ferromagnetic or conductive materials [2,3,4]. These techniques have proved to be efficient, reducing the field at a great percentage in some cases.…”

A Survey on Optimization Techniques Applied to Magnetic Field Mitigation in Power Systems

“…Passive techniques [23][24][25]: In this case, the MF mitigation is obtained because the mitigation system acts in response to the MF generated by the source. For example, a typical situation is when currents are induced in these elements due to Faraday's Law, which, in turn, generate a new MF that partially cancels the one from the source.…”

“…For example, a typical situation is when currents are induced in these elements due to Faraday's Law, which, in turn, generate a new MF that partially cancels the one from the source. Typical mitigation solutions in this group are passive loops [23,24] ( Figure 5a) and conductive shields [25] (Figure 5b). Another case is when ferromagnetic materials are used in the mitigation system, since they have the property to attract and trap the MF flux lines thanks to their high permeability.…”

“…This way, the MF flux lines are moved away from the region to be protected, resulting in a MF mitigation in that area. A good example is the use of ferromagnetic shields [25] (Figure 5c). In addition to these solutions, and particularly for the case of UPC, a proper electrical connection of the metallic sheaths may also provide a significant reduction in the MF.…”

Magnetic Field Analysis in Accordance with Line Configuration Type in Underground Transmission Systems

“…그리고 King Fahd University에서는 차폐판과, 상배치를 이용하 여 지중송전선로의 자계를 저감하는 연구를 수행하였고 [5,6], 영 국 National Grid에서는 전류와 거리에 따른 자계의 크기를 해석 하는 연구를 수행한 바 있다 [7]. 그러나 국내의 경우는 우리나라 지중송전선로에 적합한 포설 상황을 고려한 상태에서 자계를 해 석하거나 이를 감소시키는 방법을 다룬 연구는 희박하다.…”