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MattStolton
Old Croc Joined: 04 September 2010 Location: Walthamstow Status: Offline Points: 4234 |
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And don't forget, over 6KVA and you need to "plan" your distro and make someone competent as SPR!! I know BS7909 has its weaknesses, and plenty of critics, but a good starting point.
TBH, stick an earth spike in the ground, bond your E & N to it, and chuck a chain over your nearest overhead supply cable. You may need a 11KV to "230v" stepdown transformer...3 Chains for 3 phase, but make sure you maintain the L1/L2/L3 sequence, bit of masking tape works for labelling. |
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Matt Stolton - Technical Director (!!!) - Wilding Sound Ltd
"Sparkius metiretur vestra" - "Meter Your Mains" |
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Boxes-R-Blue
Registered User Joined: 11 December 2018 Status: Offline Points: 147 |
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If the transformer is too heavy just use 4 Jo-Jo reels in series, you should get about the 10.76KV voltage drop you are looking for. You may want to print your RAMS on 3" thick PTFE paper and stack the first 2 Jo-jo reels on that! |
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Kinda Been there, Kinda done that, YOU COULDN'T handle my bar bill!
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Boxes-R-Blue
Registered User Joined: 11 December 2018 Status: Offline Points: 147 |
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about 15% of 2KVA is 300VA, which a 250W twister (if it is the halogen thing I think it is) would cover (2KVA genset prob has a 0.85 PF so 250W is about 300VA)......
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Kinda Been there, Kinda done that, YOU COULDN'T handle my bar bill!
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MattStolton
Old Croc Joined: 04 September 2010 Location: Walthamstow Status: Offline Points: 4234 |
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To load bank properly, get a 3 phase hairdryer the size of a transit, and dump 25-40% of genset through it. Or at Glastonbury, run undermud heating elements, to dry things out. Getting power that nice, is that silly. Big thing in L&SI mag a few years back about how much load banking at festies, all burning diesel, may not be so good. And takes proper planning. Try clamp metering your system off of a mains supply, to see what it actually is drawing, with a PF display somewhere on your distro. May give you some idea? Most of my junk is QSC, and manuals offer guidance as to current draw vs load vs program material. Not a bad way to guesstimate.
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Matt Stolton - Technical Director (!!!) - Wilding Sound Ltd
"Sparkius metiretur vestra" - "Meter Your Mains" |
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100 Volt-line
Registered User Joined: 05 May 2011 Status: Offline Points: 122 |
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For load bank purposes, I have a 6Kw per phase industrial heater; it can be set on full or half power. This gives the generator something to do, and an extra bonus is a bit of indoor heating if its a winter job!
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Noyzmunky
Young Croc Joined: 10 June 2005 Location: United Kingdom Status: Offline Points: 1260 |
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cheers boxes-r-blue.
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my name is Inigo Montoya...you killed my father, prepare to die!.
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Boxes-R-Blue
Registered User Joined: 11 December 2018 Status: Offline Points: 147 |
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Pretty much Exactly what i use, but a 15KW variant. A Bit miffed to find it pulls 20A per phase (IE is Star wired) I would have hoped it would be delta wired to get the same result with a bit less current... Only has 2 power settings, 7.5 and 15KW but a pair ballast a 125KVA set nicely. Note I always place these right next to the set (I just double lug and run a gig distro and a Dump distro) and you would be mad to add 30KW of load to increase your voltage drop on your main feeder! |
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Kinda Been there, Kinda done that, YOU COULDN'T handle my bar bill!
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100 Volt-line
Registered User Joined: 05 May 2011 Status: Offline Points: 122 |
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Only ever put it inside if genny is close by. On long distro? Heavens no! Edited by 100 Volt-line - 30 March 2020 at 11:13am |
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