Search results for query: *

Another consideration needs to be practicality of access in the future for repair if the cable ever goes faulty. Going deeper will increase the cost of excavation and the complexity of the excavation. Consider using conduits. If you are direct burying for rating then an option is to fill the...

Second try with the BVP17 Manual. Regards Marmitehttps://files.engineering.com/getfile.aspx?folder=f02fa069-bb5d-4923-90b6-62dacaff6067&file=BVP17MET.PDF

Have a look here for your contacts:- https://www.alcomet.net/oil-circuit-breaker-contacts/gec-aei-switchgear-contacts. They list BVP22 as well as BVP17. I don't have the BVP22 manual but I have a BVP17 manual. See link. Isn't it time you got these old things off your system, or at least fit...

Switchgear panel heaters are not normally considered essential loads. Protection, SCADA, Comms, Security, emergency lighting and fire systems are essential loads. If you only have battery capacity to sustain essential loads for 2 hours after loss of mains power, then I wouldn't be worrying about...

My experience is similar to Scotty's. Manufacturer supplied drawings are provided with a corporate drawing number and CAD border. The drawing number typically has a substation identifier, whether its civil, electrical etc, and whether its a layout or a schematic etc, so you typically want the...

And another. https://www.cressall.com/neutral-earthing/ Rwgards Marmite

Probably because the ASL wouldn't necessarily clear the downstream fault, which could be maintained by backfeeding from the generator, or the remaining two live phases. If the generator is connected via a delta star transformer with the delta facing the generator and the star feeding out to the...

There isn't any voltage that is sensible to calculate or measure. It is shunted by the sheath to earth bonds. The issue becomes one of circulating current rather than of voltage.If you really wanted to calculate the voltage between two arbitrary points, calculate the circulating current and the...

I've worked in Companies where there are all kinds of legacy system phasing standards. In the UK system phasing uses the colours Red, Yellow and Blue, and by convention you would expect them to correlate with ABC physical terminals, but that isn't necessarily so. It's important that the...

Has the cable rating study been based on single point bonding? If it has then solidly bonding the installation would potentially derate the cables. For your wind turbine feeder there is likely to be less of an effect because the current must be reasonably low if you are only using 1 cable per...

Standby earth fault protection is as RRaghunath described. It is not normally switched in or out of service. Just another example how the same words can mean different things to different people. Broken delta/open delta are other fine examples. SBEF protection is sometimes staged, for example if...

If it's an overhead line it would be hard drawn copper. The rating depends on the design operating temperature of the line, ambient temperature, solar intensity and wind speed. Is it ratings you are looking for, or physical parameters? Regards Marmite

Haefely became Trench. See http://trenchgroup.com/en/Company/Siemens-Ltda.-Brazil Regards Marmite

EA Technology in the UK has a range of products that would fit the bill. https://www.eatechnology.com/engineering-products/partial-discharge-solutions/cabledata-collector/ Regards Marmite

I would think that this would be a no brainer if it is indeed a "critical switchgear room on an offshore platform". There is an existing active fire fighting system in place, so someone must have decided at the time that the risk of a fire happening, or the consequences of a fire were so...

With multicore cables the forces are contained within the cable and do not have any bearing on the selection of cleats. The cable manufacturer designs the cable with sufficient strength to avoid bursting under fault current scenarios. As long as you specify a cable that is adequately rated for...

If the screen is adequately rated for the fault current then you wouldn't need the ground continuity conductor for a multicore cable installation. Generally as your cable rating requirements increase you would move to single core cables, in which case for a given cable size you can get more out...

There are basically two alternatives for the transformer. It can have either close-coupled or loosely-coupled secondaries. Both LV windings have to be disposed symmetrically with respect to the HV winding so that they have identical impedances. There is a crossover between the two LV windings...

The procedures outlined are all standard practice in transmission/distribution utilities I have worked in both in the UK and Australia. Sure, there are some variances, but the basic principles are the same. The HV equipment is isolated and earthed by a switching operator. (in some Companies this...

This old UK Power industry document gives the original factory test details. Might be of use. Regards Marmitehttp://files.engineering.com/getfile.aspx?folder=32bba928-b63a-4a74-ab0b-06255eb4893c&file=TECHSPEC_9-8_(1977).pdf