3-Phase Stepped Transformer Core Frame

General Specifications: Ratings ($315\text{ kVA}$, $11000/433\text{ V}$, $50\text{ Hz}$, 3-phase star/delta), $CRGO\text{ Grade 56}$ material, $B_m = 1.5\text{ T}$, current density $\delta = 2.5\text{ A/mm}^2$, $\pm 5\%$ tappings, and ONAN cooling ($< 55^\circ\text{C}$ rise).Core & Frame Design: $E_t = 7.986\text{ V} \approx 8.0\text{ V}$, core flux $\Phi_m = 0.0359\text{ Wb}$, net iron area $A_i = 23,900\text{ mm}^2$, 3-stepped core diameter $d = 199.58\text{ mm} \approx 200\text{ mm}$, lamination widths ($a = 179.6\text{ mm}$, $b = 139.7\text{ mm}$, $c = 83.8\text{ mm}$), window area $A_w = 84,450\text{ mm}^2$ ($H_w = 503.4\text{ mm}$, $W_w = 167.8\text{ mm}$), center distance $D = 367.4\text{ mm}$, and overall frame dimensions ($H = 858.3\text{ mm}$, $W = 914.3\text{ mm}$, $D_y = 179.6\text{ mm}$).LV & HV Winding Design:LV Winding: $250\text{ V}$ phase voltage, $T_s = 32\text{ turns}$, $I_s = 420\text{ A}$, $a_s = 168\text{ mm}^2$ (4 parallel paper-covered strips $1.6 \times 9\text{ mm}$), 2-layer helical, $ID = 202.6\text{ mm}$, $OD = 212.10\text{ mm}$.HV Winding: $11,000\text{ V}$ phase voltage, $T_p = 1408\text{ turns}$ ($1479\text{ turns}$ at $+5\%$ tap), $I_p = 9.54\text{ A}$, $a_p = 3.816\text{ mm}^2$ ($2.24\text{ mm}$ round wire), 8 crossover coils, $ID = 243.1\text{ mm}$, $OD = 331.8\text{ mm}$.

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