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Hi i need to know if the steel (St 52-3) is suitable to build a duct working at (400 degree C) for the cement factory. could any one tell me which mechanical proerties affect the thermal ducts design. any ref.,links, files would be so appreciated. thanks

dear friends yes there is a single phase power supply for that system the manufacturing companies deal with. the SMPS is another power supply solution for the electrostatic precipirator the companies deal with now days. although i worked for along time in electric and electronic field, i tell...

Dear friends the power supply for this industrial system consist of single phase HV transformer with the rectifier buit inside the oil tank of the stepup transformer. i need to know more detailed information about that industrial power supply it didnot use voltage multiplying methods(it may use...

hi i need to know the types of rectifier diodes and rectification methodes suitable for obtaining a dc power of 110kv at 1 amp. suitable for supplying the electrostatic precipitator of cement factory best regards

jtkirb I do ask a precipitator cable mfg but till now i got no answer this size of cable must has relation with electrostaic preci. , it has no meaning to understand cable size & current alone. if i get the answe i will respond

If you search the web under item "precipitator cable" you will see the detailed specification of the cable. 1. i donot know the manufacturer but there are Copper and Aluminum cables used in electrostatic precipitator , and i donot know what the drawback of Al. cable. 2. working voltage 70 kv...

But corona and corrosion occur inside the precipitator not around the cable that transmit hv current from transformer to precipitator

Dear Friends thankyou for replay ,but the electrostatic precipitator working voltage is 70 KV DC, taking from hv transformer & rectifier.The normal dc current is 0.5 Amps . Cable length is about 60 meter. So for the voltage drop reason of that huge cable size of 70 sq.mm Copper is not satisfied...

hi i need to know why is the precipitator cable cross section area used in cement factory = 70 sq.mm although its average dc current < 1 amp. Also i need to know why it is generally be Copper and not Aluminum cable. any information or link will be appreciated

Dear cukt2000 could you please give me a link to read more about this topic?

hi i need to know exactly the specific heat of silicon steel used in building the transformer cores. is it same as the (iron/steel) specific heat that is ( 452 J/Kg/K ) thank you

if you need to know the ct saturation you need to do excitation current test.By this test you find the relation between the secondary voltage if ct and excitation current responsible for induced voltage. you will see that the curve of relation will have linear region and tend to saturate and...

Dear scottf in another pt name palte with two output coils of (( 6600/square root(3),100/(sqare root(3),100/3 )) ratio, i read these data: outlet terminal marking: a,n : da,dn rated output (VA) : 30 : 50 accuracy class : 0.5 : 6P...

i need to know what is the meaning of ( limit output=200VA ) written on the name plate of a potential transfomer of 6600/100 volt ratio, with a rated output of ( 30 VA ) this pt is single phase class=0.5 transformer.

hi i need to know whats the meaning of class ( 6p ) that i found in the name plate of a potential transformer of two secondary windings ( first coil class is 0.5 ) and the pt is made in China. where could i find any detailed information about this please thank you

Dear CarlPugh 1. the linearity is not a problem for me and i think there was a type of power resistor called Ballast resistor( that has a high temperature coefficient ) which change its value rapidaly with temperature is more active to my application. 2. i tested the resistor by dc method,but...

Dear CarlPugh i built the resistor and test it and it is working well but i need to know how long time it will stay working before failer i would like to ask about an equation that take the case of heat transfer into account. thank you alot for your replay

Dear skogsgurra the thickness = 0.3 mm and the resistor at room temp. it is fitted horizontally for air convection heat transfer.

i built 0.1 ohm power resistor in order to use it in induction furnace start cct. the current that must pass throught is: 1000 amper for one second. could any one help me finding an equation that connect the temperature with time for the resistor. for more details the resistor width is 60 mm ...

dear CarlPugh yes i am using a simple electronic circuit that has an input impedance of 200 ohm , it is designed and built to start cut off of a simple relay at threshold voltage of 1.00 volt. as i mentioned above i solve the problem by using larger core area, but the question of why that ct...