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Fault current limiters (FCL) with the cores saturated by non-superconducting coils
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A non-superconducting, coil technology, used in superconducting magnets/coils, emergency protection circuit devices for limiting overcurrent/overvoltage, inductors, etc. loss, etc.
Inactive Publication Date: 2012-09-19
BAR ILAN RES & DEV +1
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Actually, based on what was explained above, it would not have occurred to me to do so, since the motivation for using an open AC magnetic circuit was to precisely reduce the mass of the AC magnetic circuit, while requiring very large ampere-turns in the DC bias coil number, which prevents the use of non-superconducting coils (e.g. copper) and will result in very high ohmic losses and very large coils
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[0056] In the following description, various embodiments are described. To the extent that features are common to various embodiments, the same reference numerals will be used to refer to components common to more than one figure.
[0057] In order to more fully appreciate the advantages of the present invention, it is advantageous to first consider a typical prior art single-phase FCL. to this end, figure 1 A prior art saturable core single phase FCL 10 is diagrammatically shown having a magnetic circuit comprising a pair of closed magnetic cores 11a and 11b each supporting a respective AC coil 12a and 12b. The core also supports a pair of DC superconducting bias coils 13a and 13b.
[0058] figure 2 A circuit diagram of a system 20 is shown schematically, showing a single-phase FCL 10 in use. An AC power source 21 , typically from the grid, is connected to a load 22 via a circuit breaker 23 . A load 22 is connected in series to the two AC coils 12a and 12b of the FCL 10...
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Abstract
A current limiting device (30, 40, 50, 60) comprising for each phase of an AC supply a closed magnetic core (31) of reduced volume and mass having first and second pairs of opposing limbs (32a, 32b; 33a, 33b), and at least one AC coil (35a, 35b) enclosing opposing limbs (33a, 33b) of the magnetic core (31) and adapted for series connection with a load. A non-superconducting DC bias coil (34) typically formed of copper encloses a limb (32a, 32b) of the magnetic core (31) for saturating each of the opposing limbs (33a, 33b) in opposite directions by the bias coil (34). Under fault conditions, the AC flux in at least one limb counteracts the DC bias flux, bringing the limb out of saturation. Preferably, current is reduced in the DC bias coils thus bringing both opposing limbs of the core out of saturation.
Description
[0001] related application [0002] This application is the c-i-p application of USSN 12 / 066,228 filed on September 7, 2005, entitled "Fault current limiters (FCL) with the cores saturated by superconducting coils", corresponding to WO 2007 / 029224. technical field [0003] The present invention relates to current limiting devices for AC power grids. [0004] references [0005] In the description below, reference is made to the following publications: [0006] [1] B.P.Raju, K.C.Parton, T.C.Bartram, "A current limiting device using super-conducting d.c.bias: applications and prospects" IEEE Transactions on Power Apparatus & Systems, Vol.101, pp.3173-3177, 1982. [0007] [2] J.X.Jin, S.X.Dou, C.Grantham and D.Sutanto, "Operating principle of a high T-c superconducting saturable magnetic core fault current limiter", Physica C, 282, Part 4, P.2643-2644, 1997. [0008] [3] J.X.Jin, S.X.Dou., C.Cook, C.Grantham, M.Apperley and T.Beals, "Magnetic saturated reactor type HTS fault c...
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