electrialstandards

Induction motors are part of every industry and Household. There are motors available from fraction of KW to 375 KW motors. Induction motors are also available with higher ratings but those are HT motors. AC Motors current rating chart for induction motors is as given below:- KW Rating Horse power rating Three Phase (415V Supply) Single Phase 220V Supply 0.1 1/8 0.4 1.6 0.12 1/6 0.5 1.9 0.18 1/4 0.7 2.3 0.25 1/3 0.9 2.9 0.37 1/2 1.3 3.9 0.56 3/4 1.6 5.5 0.75 1 1.8 7.3 1.1 1.5 2.6 10 1.5 2 3.4 13 2.2 3 5 19 3 4 6.5 24 3.7 5 8 27 4 5.5 8 30 5.5 7.5 11 41 7.5 10 15 55 9.3 12.5 18 10 13.5 20 11 15 22 15 20 28 18 25 36 22 30 39 30 40 52 37 50 69 45 60 79 55 75 96 75 100 125 90 125 156 110 150 189 130 175 224 15

Cable selection chart for motors (Induction motors) for 3-Phase power supply is as below:- Motor rating on KW Full load current of motor Main Cable Size requirement 0.06 0.21 1x3 CoreX1.5mmSq copper cable 0.09 0.32 1x3 CoreX1.5mmSq copper cable 0.12 0.38 1x3 CoreX1.5mmSq copper cable 0.18 0.58 1x3 CoreX1.5mmSq copper cable 0.25 0.7 1x3 CoreX1.5mmSq copper cable 0.37 1.1 1x3 CoreX1.5mmSq copper cable 0.55 1.3 1x3 CoreX1.5mmSq copper cable 0.75 1.8 1x3 CoreX1.5mmSq copper cable 1.1 2.4 1x3 CoreX2.5mmSq copper cable 1.5 3.2 1x3 CoreX2.5mmSq copper cable 2.2 4.5 1x3 CoreX2.5mmSq copper cable 3 5.9 1x3 CoreX2.5mmSq copper cable 3.7 7.3 1x3 CoreX2.5mmSq copper cable 4 7.7 1x3 CoreX4mmSq copper cable 5.5 10.5 1x3 CoreX4mmSq copper cable 7.5 14 1x3 CoreX4mmSq copper cable 11 20.5 1x3 CoreX6mmSq copper cable 15 27 1x3

Induction motors are backbone of any industry. There are various International and Indian Standards while designing and selection of motors. While selection of induction motors following standards are used:- Codes and Standards used in Designing and Selection for Induction motors Codes and Standards Description IEC 60034-1, IEC 60085, DIN EN 60034-1 General specifications for rotating electrical machines IEC 60034-2, DIN EN 60034-2 Specification of the losses and efficiency of rotating electrical machines IEC/EN 61241, DIN EN 61241 Areas containing flammable dust IEC/EN 60079-15, DIN EN 60079-15 Type of protection “n” (non-sparking) IEC/EN 60079-7, DIN EN 60079-7 Increased safety “e” IEC/EN 60079-1, DIN EN 60079-1 Explosion-proof enclosure “d” IEC/EN 60079-0, DIN EN 60079-0 General regulations IEC 60034-5, DIN EN 60034-5 Degrees of protection of rotating electrical machines

Transformers are backbone of electrical systems. Transformers are used for both stepping up and stepping down the voltage. While procurement of  Distribution Transformers there are following technical aspects which should be considered :- For Tan-delta, Loss angle test visit link:- http://electrialstandards.blogspot.com/2015/10/tan-delta-test-loss-angle-test.html Below are the technical specifications of Oil type 400 KVA transformer :- 1.         Transformer voltage ratio should be 11 KV/ 433 V 2.         Vector group should be Dyn11 3.         Transformer Impedance at 75 degree Celsius should be 5% 4.         Transformer-400 KVA maximum no load losses should 0.7 KW 5.         Transformer-400 KVA Maximum full load losses should be 5.1 KW 6.         Transformer Oil Temperature rise without enclosure  should be 35 Deg C max over ambient 40 Deg C 7.         Transformer Winding Temperature rise without enclosure should be 40 Deg C max over ambient 40 Deg C 8.         Current density of LT