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Hi Guys, Please assist me in confirming whether one can share 12 RIO panels with 15 Remote outlets for cameras sharing a 24core Multimode fibre cable.

I thought I would share the video. OHL covered in Coal dust + light rain.https://files.engineering.com/getfile.aspx?folder=78674e25-d3b4-48bd-b21d-0522b169e55b&file=e2138432-93fc-4f79-9c47-91fc394ce029.MP4

Hi Guys Our site guys tested a phase to phase fault on the MV side of a 800kVA Dyn11 transformer after it blew fuses out 2 phases on the incoming 22kV Line. The 22kV line is shared with 14 other customers. The testing of the LV side 400V was clear. There was no lightning strike. Feeder cable...

Hi Guys, What's your opinion on what's the best method on terminating a 22kV XLPESWA cable on C class bushings on a 22/420V 800kVA Transformer Putty and Tape or 24kV Boots will either be adequate.

Hi Guys, I am busy with a small Bord and Pillar coal mine in RSA.I have inspected secondhand Gate end boxes which will have to be refurbished however, there were no schematic diagrams available for internal control components. I thought maybe someone can share a standard diagram which meets the...

Hi Guys, Sizing a LV transformer for motor starting is fairly straight forward (VD) however, I have attached an excel spread sheet that I have used for starting a 110kW DOL drive I wondered whether there is a norm for sizing Standby...

Hi Guys, Does the earth fault calculation follow the same sequence as a short circuit calc. for example I have a 22kV/11kV 4000kVA 6.4% Z Dyn11 Transf. 300amp NER and a 300metre length of cable 3c/70mm2 XLPESWA Z = 0.356 Main Intake Earth Mat = 5 Ohms should one take the primary impedance of...

Hi guys, I am busy with a ship loader in Peru we have a 630kVA 440V TX on board, all the drives ,including conveyors, winches aux drives must turn clockwise except for one side of travel which should turn ant clockwise, instead of checking each motor can we not check the LV side of Transformer...

Hi Guys, what is the norm for Starts per/hour for large LV motors 600kW 690Volt 50Hz either DOL or VSD's is there any literature available on this subject.

Hi Guys, when using a standby generator at the house 5.5kW 50hz 230volt supply everything is ok until the Microwave oven is switch on, then the Fluorescent lights start intermitent starting.the genset is lightly loaded at the time,The microwave oven is ten years old.any thoughts on what is...

Hi all, a colleague of mine is proposing paralleing two 750kW 6.6kV DOL motors on a conveyor (two gearboxes with a fluid couplings)me I am from the old school I would have seperate breakers and contactors with interlocking between drives. Is there a regulation prohibiting the paralleling of...

Hi Guys i am battling to find a 11000/ 550volt 50Hz 1600kVA Dry Type Dist Transformer ( comply with IEC60076-11)which must operate on Surface in an ambient temperature of 50 Deg C in South Africa in a coal dust environment. Any international contact persons such as ABB, Siemens , Italy etc would...

Hi Guys, I am trying to source a Transformer company that has Type Test Certification IEC 60076-11 for a Vacuum Pressure Impregnated Insulation in a IP65 enclosure. My clients requirement is a fully rated 1600kVA 11000/550volt no load AN operating in a ambient temparature of 50deg C although my...

Dry type transformer winding tests - one of the test is a BIL is this the same as a Impulse test is this type testing?

Hi guys, we have a moving spreader on rails 11kV/550v Dyn11 TX + 10 amp NER on board fed via a 11kV trailing cable 1,2km with bundle cores + 35mm2 earth core 0.554 Ohms/km how can we achieve touch potential to <50volts rails would also be earthed. Thx Padlock01