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Hi, To comply with the requirements of AS3007 for surface mines, our earthing (grounding) expert has decreed that we need separate earthing for our 3.3kV distribution, away from our 33/3.3kV switchyard. The issue is, about the only available real estate in the vincinity is about 6m away from...

Hi, Our standard transformer specification requires "An earthed, interleaving shield shall be installed between the primary and secondary windings" for electrostatic reasons. A vendor has responded that they normally do not apply this to two winding transformers and to comply would require...

I need to replace a 500kVA 3.3kV/415V transformer out on a wharf. The existing transformer is an oil-filled sitting outside on the wharf, without any oil bunding. Being in pristine tropical waters, a bund is required for the replacement. To me it makes sense to use a fully-enclosed, self...

Thanks to everyone for your responses. Yes, it certainly appears for an outdoor installation the 'Blast Walls' are are typically designed as more of a 'Fire and Shrapnel Wall'. For everyones reference, an excellant comprehensive guide for fire protection design for substation is the Australian...

Hi, Does anyone have experience with designing transformer blast walls? All standards I've read say something on the lines of "Install a suitable blast wall", without providing any information on the strength the wall needs to be. I am asking this question in a general sense as I know I will...

Sorry, to clarify my query above, the bonding is relating to the screen. As these cables are within the switchyard compound, no metallic armouring is used, purely the heavy duty screen, rated for 10kA/1sec. As another note, if the screen is only bonded at one end, that infers to me that there...

G'day, I need to run a 3.3kV cable from a 10MVA 33/3.3kV transformer to a prefabricated substation within the same switchyard. At 1750A, with derating factors due to the heating effects of parallel cables, it looks like I need 4 parallel runs of 630mm^2 1C cables (12 cables); presenting some...