Recent content by sramesh

Thanks for your post ScottyUK, noted your suggestion for further evaluation Regards

Thanks for the reply - Power0020, Skogsgurra and prc On PRC comment, I forget to mention GTG is having a 55MVA transformer before connecting it to the 66kV bus, which is softstarts along with Generator. 90MVA transformer is distribution transformer from the BUS. We have 3 other STGs of 42MW...

We are evaluating whether 90MVA, 66/33 kV Tranformer switching is possible with one 43.5MVA Gas turbine Generator connected to 66kV busbar.The question is whether one 43.5 MVA Generaor will be able to withstand the switching inrush current of the 90MVA transformer(inrush is 5.3 times of I fl as...

Good day to you We are in theprocess of replacing the existing damaged submarine 15kV cable (EPR insulation) with new cable. Some of the vendors are offering XLPE insulated cable instead of EPR insulation.This cable is used for off shore gas platform where the reliability is main...

Good day to you The mentioned submarine power cum Communication (Optic fiber) cable of 20 km length has a outer sheath damage due to a Boat Anchor stuck and pulled the cable by 20 mtrs. The cable is still live and there is no abnormality is recorded. The underwater inspection shows a minor...

Kiribanda, Good day to you My query is using only EX e box for installing MCB, switching device which can create spark. Your attachment of Ex d e box has a separate Ex d compartment where any normal switching devices can be installed. it ha sno issues as inside Ex d box there is no...

Kiribanda, The attached file is on Ex rated MCB of COOPER for your reference Regards Rameshhttp://files.engineering.com/getfile.aspx?folder=618fe5e6-d58e-409c-b248-b55ec720bcf2&file=REF_2_-Original_Option_no_2_MCB_data_sheet.pdf

Good day to you Please refer the attached files, which specifies that any spark producing component shall be Ex certified. Regards Rameshhttp://files.engineering.com/getfile.aspx?folder=9fff7cf5-830c-491f-8851-2888221a3fb7&file=ex_e.zip

Good day to you Thanks for the replies I forget to mention( apologies), the u/f & df/dt Load shedding is proposed trip the out going feeders (based on its criticality to the plant plant operations) connected to our main distribution 33KV Bus to protect the running Generators not to trip on its...

Good day to you We propose to introduce a MCB inside the Street Lighting Junction box ( EX e Certified) installed in Hazardous area. Contractor propose to use a normal MCB with C curve. The query is whether MCB should also be Ex cerified. Ex panel manufacturers like Stahl are providing Ex...

Good day to you Our consultant recommends U/f & df/dt relays setting with 100msec time delay for load shedding scheme (4 stages of load shed from 48.5 to 47.8 @ 1 Hz/sec)to avoid black out in case one/few generators sudden trip.( our electrical system is with own generation and no link with...

Thanks for all the replies, the cable is installed in the normal area, no acid or chemical handling area. We feel the failure is due to cable external damage happened during laying. Thanks again Ramesh

Good day to you Our installation is LNG production plant(Oil and Gas) We have a failure of a 6.6KV power cable near to the equipment located in Hazardous area IEC Zone 2. Planning to cut the faulty portion of the cable and splice it with a short piece ofnew cable. We are debating on the safety...

Thanks to all for the inputs,It is clear after site verification, The incoming scheme of both the lines are different and the new transformer is proposed Dzn0 will compensate the phase angle differnece. Thanks again Regards Ramesh

Thanks Bill and DPC, Both the sources are from the same national 132kV Grid, I will check the upstream transformer schemes of 6.6 and 11kV sources. Thanks again for the quick responses Regards Ramesh