thanks all dear engineers for your replies,
are there any chances that moisture is contained by solid components inside the bay like copper contacts, insulators etc all which are packed inside the GIS bays.
I have a question from all respected memebers. The pressure in GIS is always above atmospheric pressure (6.5 bar in Circuit Breakers and Isolators and 5.5 in VT/PT and Busbars), while atmospheric is always less (say 1 atm). In case of leakage, it is confirm that always SF6 will be released into...
Dear submonkey and FPelec,
Thanks for advice, for the first time we also thought same, but due to some economical reasons and other management problems, we are provided the task to attempt it in house. So, kindly guide how to do it.
Dear Scotty UK,
Thanks for comments. Yes, we shall create a...
space between Pt bottom and floor photohttp://files.engineering.com/getfile.aspx?folder=b94f5bc3-454b-4b76-a885-7d32e7045022&file=Mobile_Grid_PT_Bottom.JPG
Dear Respected engineers,
Referring to the attached photographs, we have a mobile GIS (Gas Insulated Substation), made in 1992 by ABB Lodi, Italy. The mobile GIS primary voltages if 132kV at 50Hz.
The problem we are facing is that past few months, is that PT drops its pressure of SF6 gas...
Hi all,
We have a 184 Cell (each cell is of 275Ah, 1.2V, Gaz Make NiCd )battery bank and a battery charger which is some 20 years old. Now, I want to test battery charger for its performance that it is performing good or not?
1. What paramters should I test and check for performance of...
Dear Gra 09,
We had previously faced same problem some time ago. I would suggest that you read the name plate of cooling fan motor very carefully and ensure that whatever connections they say (Star or detla), you are connecting them in same way.
Also, I would suggest that to rule out if fault...
dear lukin 1977,
from the picture it believes to me that this occurs due to the insulation failure between turns of the coil. As most area of the coil is burnt, but some area at the top of coil is still good, So it more seems inter turn short in the coil rather than any other reason.
Can you...
Dear Safiabd,
All the advices given by expert electrical engineers are very valuable and practical. If is it possible for you to share the data sheets and curves of existing motor, resistors, and all systems also with which you are planning to buy (softstarter and squirel cage motor) then it...
dear all,
I am now conforted to maintenance and re conditioning of various type of old and new MOVs (Motor Operated valves). I have no past experience with these devices. Can i get some good technical literature, books on them how they work, types, troubleshooting etc etc.
I am sorry, if there...
dear waroos,
Thank you for your comment. I want to clarfiy one thing you mention, you say if voltage is increased from 208V to 240V, the kVA will change, I agree. But impact it will have on alternator current carrying capacity? as current carrying capacity is determined by size of winding...
