Passive and active shielding of power-frequency magnetic fields from secondary substation components

Magnetic-Field Measurements Near Two-Pole-Type Distribution Substations

“…As mentioned in [25]- [28], plates made of different materials and thicknesses can be used to cover the LV fuse boxes and the LV and MV cables.…”

“…The different methods of magnetic-field shielding that are applied in MV/LV substations are presented in [25]- [28]. These methods refer to the replacement of busbars with cables, and the replacement of a transformer with a new one that could produce a lower magnetic field, covering transformers and cables with aluminum plates and changing the arrangement of the phases in the LV conductors, as well as a combination of the aforementioned methods.…”

Method for Shielding the Magnetic Field Generated in a 132/33/11(6.6)KV Baghdad Indoor Distribution Substation

“…The problem is how an efficient technique can be developed for shielding of this undesirable influence of electromagnetic field. During the years, to the recent days several papers have been published investigating different types of shielding and determining their efficiency in magnetic field reduction [3][4][5][6].…”

Το μαγνητικό πεδίο στο περιβάλλον των υποσταθμών διανομής (20kV/40V) και μέσα περιορισμού του.

“…ηε βηβιηνγξαθία δίλνληαη δηάθνξεο κέζνδνη εμαζζέληζεο ηνπ καγλεηηθνχ πεδίνπ πνπ εθαξκφδνληαη ζε ππνζηαζκνχο εζσηεξηθνχ ρψξνπ [96,97,98,99,100,102,103,104,105,106]. Πξφθεηηαη θπξίσο γηα αληηθαηάζηαζε ησλ δπγψλ απφ θαιψδηα, αιιαγή ηνπ κεηαζρεκαηηζηή απφ άιιν λεφηεξεο ηερλνινγίαο, ζσξάθηζε κε πιάθεο αινπκηλίνπ ζε κεηαζρεκαηηζηέο θαη θαιψδηα θαη ε αιιαγή ηεο δηάηαμεο ησλ θάζεσλ ζηνπο αγσγνχο ρακειήο ηάζεο.…”

“…Tα απνηειέζκαηα ησλ κεηξήζεσλ ηνπ καγλεηηθνχ πεδίνπ ζε δπν κεηαζρεκαηηζηέο 10/0,4 kV, 800 kVA ζε έλα ππνζηαζκφ εζσηεξηθνχ ρψξνπ κε θαη ρσξίο ζσξάθηζε θάησ απφ ίδηεο ζπλζήθεο ιεηηνπξγίαο δίδνληαη ζηελ [96]. Σν κέζν γηα ηε ζσξάθηζε πνπ ρξεζηκνπνηήζεθε ήηαλ έλα αινπκηλέλην δνρείν πάρνπο 5 mm.…”