By Simon McGinnes (auth.), Pericles Loucopoulos (eds.)
The turning out to be call for for info platforms of ever-increasing measurement, scope, and complexity has highlighted the advantages which may be amassed from methods which realize the interrelationships among assorted technological strands within the box of data platforms. general examples of those parts contain: method improvement equipment, CASE, specifications engineering, database layout, and re-use. The CAiSE sequence of meetings offers the discussion board for the alternate of effects and ideas inside those diverse technological spheres from a unmarried point of view, specifically that of knowledge structures improvement and administration. The 1992 convention, the fourth within the sequence, keeps this practice. This quantity collects the papers approved for the convention, with authors from sixteen international locations masking a variety of themes together with: object-oriented research and layout equipment, the advance method and product aid, necessities engineering, re-use, layout ways, and deductive approaches.
Read or Download Advanced Information Systems Engineering: 4th International Conference CAiSE '92 Manchester, UK, May 12–15, 1992 Proceedings PDF
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Additional info for Advanced Information Systems Engineering: 4th International Conference CAiSE '92 Manchester, UK, May 12–15, 1992 Proceedings
7) where l is length of each magnetic section. It is not practically possible to calculate the no-load current by estimating ampere-turns required in different parts of the core to establish a given flux density. The calculation is mainly complicated by the corner joints. Hence, designers prefer the second method, which uses empirical factors derived from test results. Designers generally refer the VA/kg (volt-amperes required per kg of material) versus induction (flux density) curve of the lamination material.
Now, ohmic value of the leakage impedance and resistance referred to the HV side can be calculated as Per phase value of load-loss= Now, the equivalent circuit quantities calculated on the HV side can be referred to the LV side using the transformation ratio a, where VpL and VpH are phase voltages of LV and HV windings respectively. Similarly, In per-unit quantities, Copyright © 2004 by Marcel Dekker, Inc. 50 as Similarly we can directly infer the value of (XeqL)pu, which is almost equal to (ZeqL)pu, from the short circuit test results because it equals the fraction of rated voltage applied to circulate the rated current, b) Efficiency can be worked out either by using per-phase or 3-phase quantities.
Let the actual currents drawn be Ir, Iy and Ib. 7 Three-phase three-limb core with Y connected primary Copyright © 2004 by Marcel Dekker, Inc. 21) Higher the magnetizing asymmetry, higher is the magnitude of I z. The magnetomotive force, NIz, is responsible for producing a zero-sequence leakage flux in the space outside core between points P1 and P2 . The magnitude of this zero-sequence leakage flux is quite small as compared to the mutual flux in the core. For convenience, the reluctance of the magnetic path of winding y between points P1 and P2 is taken as half that of windings r and b.