Thank you fx007,
I have found that blue indicating silica gel consists of cobalt chloride which is toxic and carcinogenic.
It was thus prohibited in European and American markets since 2000.
The new alternative is the ORANGE silica gel which is indicative and depends on organic substance...
It there any standards or specs. for the silica gel used in the transformer breather ( ranges 2.5-5 MVA)
such as size (in mm or mesh), shape ( spherical , ... ), water absorption capacity , loss on drying , ...
There are many products/manufacturers of blue indication silica gel. Which one...
We have a 25 MVA - 66/11KV ONAF transformer which has been working for more than 20 years
Now we have to operate the transformer at around 14 MVA ( 56% )only to avoid over temp. trips
My question here is :
1) How to make an assessment for the current status of the transformer and estimate the...
Dear All ,
1) What is the maximum acceptable earth (ground) resistance for intrinsically safe IS instruments
and for non intrinsically safe instruments NIS??
2) what is the maximum earth resistance for grounding a PLC and DCS sytems according to standards ?
as i know that for other electrical...
Dear All ,
1) What is the maximum acceptable earth (ground) resistance for intrinsically safe IS instruments
and for non intrinsically safe instruments NIS??
2) what is the maximum earth resistance for grounding a PLC and DCS sytems according to standards ?
as i know that for other electrical...
Dear all,
Please provide help in these questions ?
What is the reason of earthing the armour?
What is the use of metallic screen in HV & MV cables,and why it is earthed & why not used in lv cables?
What is the use of conductor screen (placed directly over the conductor) & (insulation screen...
Hello Every Body ,
I'm facing a situation of too much motor starts per day for For Siemens LV Motor, 75 KW , 3000 rpm , 400V on an Air Compressor Application ..
What is the minimum allowed time between DOL motor starts ( or the mumber of starts per day) to protect the motor and the contactor...
For me , I know that the function of the oil Transformer Breather is to prevent water vapour from entering inside the Transformer by using silica gel & prevent dust or soild particles from entering by using some transformer oil in the Breather cup ..
In my case I noticed that the oil level...
On a special EX canned pump Motor ,
I Found some data on the motor's name plate which is
not clear for me such as :
PN = 50 & tE = 12 s
Any body knows the meaning of these ratings ?
Thank you for you help ,
