What is the formula for window area of the transformer?
Window area available (awa) = 10.891 cm² Core number = 16. Stack Height = gca / atw = 21.99 / 3.810 = 5.774cm.
What is the formula of the depth of the yoke?
Explanation: The depth of the yoke of stepped core is equal to the width of the largest stamping. The height of the yoke for the stepped core is also equal to the width of the largest stamping. 2.
What is the range of the ratio of depth to width of core in rectangular core?
8. What is the range of the ratio of depth to width of core in rectangular core? Explanation: In rectangular core, the ratio of the depth to core should be minimum 1.4. The maximum value of ratio of depth to core is 2.
How many limbs and windows are there in three phase shell type of transformer respectively *?
Core type three phase transformer has three limbs and two windows as shown in figure. Each limb carries the low voltage and high voltage winding of a phase. In case of three phase transformer, each window has two primary and two secondary windings.
What is the transformer formula?
Vp=−NpΔΦΔt V p = − N p Δ Φ Δ t . This is known as the transformer equation, and it simply states that the ratio of the secondary to primary voltages in a transformer equals the ratio of the number of loops in their coils.
What is the formula for width of the tank for single phase transformers used?
11. What is the formula for width of the tank for single phase transformers used? Explanation: Width of tank = 2*distance between adjacent limbs + external diameter of h.v windings + 2*clearance between h.v windings and tank is the formula for three phase transformer.
What is window space factor?
Window space factor is defined as the ratio of copper area in the window to the area of the window. For a given window area, as the voltage rating of the transformer increases, quantity of insulation in the window increases, area of copper reduces. Thus the window space factor reduces as the voltage increases.
What is the formula for number of tubes?
Solution: The surface area per tube will be: Sa = πDL = π (3/12) (10) ft² = 7.854 ft² – (D – tube diameter in ft). The number of tubes required would thus be: n = 178.7 ft² = 22.7 tubes (23 or 24 tubes).
What is the formula for the thickness of AC machine?
6. What is the formula for the thickness of the ac machines? Explanation: The thickness of the ac machines depend upon the inner diameter of the frame. On obtaining the inner diameter of frame and on substitution gives the thickness of ac machines.
What is the formula for MMF for air gap?
According to the formula (3), the total value of MMF of the magnetic circuit is FΣ1=430+2·36+2·51+180+3,9=788 А. The saturation coefficient of the magnetic circuit is the ratio of the total MMF of the magnetic circuit FΣ to the total value of MMF of the magnetic circuit in the air gap Fδ.
What is the formula for brush contact loss of dc machines?
Brush friction loss = (Coefficient f friction) * Brush Pressure * Area of the brush*Commutator voltage. Sanfoundry Global Education & Learning Series – Design of Electrical Machines. To practice all areas of Design of Electrical Machines, here is complete set of 1000+ Multiple Choice Questions and Answers.