Several details, including transformer type, size, ventilation, atmospheric pressure, altitude, voltage level and clearance will have a determining factor in selecting the ideal location for the transformer required for a given installation.Īn engineer must be aware of the limitations due to the selected location of a transformer. Transformer site locationĬareful consideration must be taken when selecting the proper location for a transformer. Tag: How To Calculate Rating Of Distribution Transformer.The overall approach for sizing transformers and related system impact are similar for all types of transformer with different cooling classes. Hence, a transformer of 15 KVA, 11 KV/440 V, 3-phase delta-star, 50 Hz is selected. = 766 / 5966 (efficiency = 08 & Pf = 0.6)Īllowance for future expansion at 25 % of the required capacity How Good is Hisense Air Conditioner - Expert Review & Comparisonġ/2 HP Grinder – (05 × 735.5) ÷ (0.8 × 0.6) Therefore, VA = (HP × 735.5) ÷ (efficiency × Pf) (a) All three-phase motor loads 12 Hp assuming Pf 0.8 and efficiency 85 % If the demand factor is 0.6 and the diversity factor is 1 %. j. Two numbers, high-pressure mercury vapor lamps of 500 W, 1-phase, 230 V, 50 Hz, supply.Ĭalculate the total connected load.f. A power Backsaw, 3 HP, 400 V, 3-phase.e. A milling machine 5 HP, 400 V, 3-phase.d. A 5 KVA, 230 V, welding transformer.c. A 3 HP, 400 V, 3-phase motor for lathe machine.b. A 1/2 HP, 230 V, single phase for Grinding machine.a. A 1 HP, 400 V, 3-phase for drilling machine.Q. A small workshop has the following load to find the transformer capacity required. Therefore, a transformer of 50 KVA, 11 KV/440 V, 3-phase delta-star, 50 Hz is selected. (41 KVA, 11 KV/440 V 3 -phase is not available) Hence capacity of the transformer = 34 + 7 = 41 The load conditions are as follows :Īllowance for future expansion at 20 % of the required capacity Q. Select a suitable transformer for an Industrial area. How To Calculate Rating Of Distribution Transformer and now I will discuss how to calculate rating of distribution transformer. You can also catch me Instagram – Chetan Shidling.Īlso read – Electrical Machines Questions And Answers. If you want an article on some other topics then comment us below in the comment box. Hello everyone, in this article I will discuss how to calculate the rating of the distribution transformer or how to select a suitable transformer.
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