By Ivanov , Smolensky
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2-3 which also gives the A~t = t (i o) curve . As is seen, A~ is a maximum near the knee on the magnetization curve . As i o and (I) keep increasing, the permeance decreases . 2-5 The No-Load Current Waveform o As already noted, if we neglect the effect of eddy curren ts and the core Fig . cur ve, QJ = f (io), instantaneous flux and no-load curof a transform er rent is the same as with direct current. Therefore, since the magnetic flux has been found to vary with time sinusoidally, as defined in Eq .
Li nes, and the like. and the other clamping and packing-on t parts may also be classed as structural parts. Ch. he structural parts, choosing all oil-immersed three-phase power tr ansformer as an example . Its general arrangement is shown in Fig. 1-13. Fig . 1-13 Three-ph ase, t wo-winding, 40-MVA, 110-kV transformer with split LV windings and on-lo ad t ap-cha ngin g on the BV side: I-HO-kV bu shing; 2- 1O-kV LV bushing; 3-lifting lu g; 4- tank; 5-tubular cooler ; 6-therm al siphon filter; 7- jacking lu g; 8- oil dr ain cock; 9-blow er; IO- cas tors; ll-yokeb ands ; 12-frame tie-rod; 13-yok e cla mp ; 14 -HV ta p-ch anger ; 15-limb band s; 16- core-andcoil li ftin g lu g; 17 -conserva tor; 18-oil gauge ; 19 - expl osion stack Wind ing insulation.
With epoxy-resin-bonded bands , one nee d not use clamping studs or punch holes in the core laminations (such holes reduce the reluctance of the core and add to no-load losses) . The core and the yoke clamps along with the other parts serving to h ol d the core and coils in place make up the frame of a transformer (Fig . 1-10) . Microtransformers rated for units to tens of volt-amperes use far simpler core designs. As often as not, their cores are assemb led with one-p iece punch ings as shown in Fig .