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hi 2nos. of 5MVA and 2nos. of 2.5MVA DRY TYPE TRANSFORMERS are installed in the 26 x 6 m room. i would like to natural ventilation is adequate or any additional ventilation to be required for this area. let me know what IEC which refers the ventilation arrangement of transformer and...

Thanks for your reply. The system is already designed. so it is impossible to increase the length between MDB and DB aswellas the size of the transformer. So please let me know is the any other solution is available. Regards, LSK

Dear All i am designing a Distribution system having one 2MVA 22kV/415V Transformer and one MAIN DISTRIBUTION BOARD (MDB) and 5 Distribution Board (DB). i obtain 40kA Fault in Transformer secondary and in every DB the Fault level is more than 30kA. I want to reduce the Fault current level less...

hi can u please tell me what is the height of the working plane for the industrial building? i am doing the lighting calculation for the industrial buildings.. for office area i have considered working plane height = 0.85m from the finished floor level but is it possible to increase working...

I want to perform the High voltage test for 33kV power cable. 1. what is max. applied voltage in case of AC supply as well as DC supply? 2. which standard i have to refer?

i am planning to design a aluminium flat( not tubular busbar) busbar for 33kV, 50MVA power system. kindly let me know what is formula for verifying the area of flat aluminium basbar system.

i don't have these IEC61936-Part 1. If possible can u please send the copy of that perticular page.

Hi I am preparing layout for 220kV/66kV substation. which IEC standard I have to refer for to develop the layout for substation and which IEC standard is used for electrical clearance. Thanks & Regards, LSK

Dear Sir I want to using 220kV system. I want to give the 220kV rated voltage for Isolator in ETAP Software normally max. allowable voltage in the etap settings are 34.5kV. Can u please help me how to give the 220kV for an Isolator in Etap. In this regard please find attached...

Dear Sir I want to using 220kV system. I want to give the 220kV rated voltage for Isolator in ETAP Software normally max. allowable voltage in the etap settings are 34.5kV. Can u please help me how to give the 220kV for an Isolator in Etap.

Thank you for your response. i want to know the relation between impedance and short circuit current. if possible kindly send me the formula

Dear Sir Please let us know what is the relation between %impedance ,BIL & short circuit current of the transformer

Dear all How to convert 3 phase short circuit MVA into Single phase short circuit MVA 3Phase short circuit MVA = 20000 MVA what about the single phase short circuit MVA Kindly help me Thanks & Regards LSK

Dear sir R pu = Z pu / (1+(X/R)^1/2 = 0.008660318 / (1+ .341)^1/2 where X/R = 34.1% Also I am unable to know how did you calculate that z= 2.42 ohms can u please forward the formula to calculate the value of "Z" Thanks & Regards LSK

Thank you Mr.David Castor I have some more doubt about the calculation, please find the below calculation: System Voltage = 220kV Short circuit Amps = 52.486kA Z= (220*10^3)/(52.486*10^3) = 4.19 ohms Z base = (V base)^2/ MVA = 484 ohms MVA base = 100 MVA V base = 220 kV Z pu = Z/(Z...

Dear all, I am doing the design of 220kV/66kV 100MVA substation. short circuit MVA = 20000MVA X/R Ratio = 34.1 short circuit current = 52.486kA From the above i want to know how to calculate %Resistance(R) & %Reactance(X) Kindly help me Thanks & Regards, LSK