OT: Large generator wanted

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A

Andrew Mawson

Guest
OK nothing to do with Landrovers but some of you chaps move in
suitable circles to come across these things !

I'm looking for a large (50KVA plus up to 150KVA) diesel 3 phase
generator - preferably in an accoustic cabinet but beggars cannot be
choosers.

Anyone know of any standby sets being de-commissioned and looking for
a home? Preferably in the South.

AWEM


 

"Andrew Mawson" <andrew@no_spam_please_mawson.org.uk> wrote in message
news:[email protected]...
> OK nothing to do with Landrovers but some of you chaps move in
> suitable circles to come across these things !
>
> I'm looking for a large (50KVA plus up to 150KVA) diesel 3 phase
> generator - preferably in an accoustic cabinet but beggars cannot be
> choosers.
>
> Anyone know of any standby sets being de-commissioned and looking for
> a home? Preferably in the South.
>
> AWEM
>
>
Bloody hell what are you powering, the Queen Mary?

Peter.


 

"Pete S" <[email protected]> wrote in message
news:[email protected]...
>
> "Andrew Mawson" <andrew@no_spam_please_mawson.org.uk> wrote in
message
> news:[email protected]...
> > OK nothing to do with Landrovers but some of you chaps move in
> > suitable circles to come across these things !
> >
> > I'm looking for a large (50KVA plus up to 150KVA) diesel 3 phase
> > generator - preferably in an accoustic cabinet but beggars cannot
be
> > choosers.
> >
> > Anyone know of any standby sets being de-commissioned and looking
for
> > a home? Preferably in the South.
> >
> > AWEM
> >
> >
> Bloody hell what are you powering, the Queen Mary?
>
> Peter.
>
>

Induction furnace

AWEM


 
"Andrew Mawson" <andrew@no_spam_please_mawson.org.uk> wrote in message
news:[email protected]...
>
> "Pete S" <[email protected]> wrote in message
> news:[email protected]...
> >
> > "Andrew Mawson" <andrew@no_spam_please_mawson.org.uk> wrote in
> message
> > news:[email protected]...
> > > OK nothing to do with Landrovers but some of you chaps move in
> > > suitable circles to come across these things !
> > >
> > > I'm looking for a large (50KVA plus up to 150KVA) diesel 3 phase
> > > generator - preferably in an accoustic cabinet but beggars cannot
> be
> > > choosers.
> > >
> > > Anyone know of any standby sets being de-commissioned and looking
> for
> > > a home? Preferably in the South.
> > >
> > > AWEM
> > >
> > >
> > Bloody hell what are you powering, the Queen Mary?
> >
> > Peter.
> >
> >
>
> Induction furnace
>

.....with which to smelt the Queen Mary. ;o)

Steve


 
"Steve" <[email protected]> wrote in message
news:[email protected]>> Induction furnace
>>
>
> ....with which to smelt the Queen Mary. ;o)
>
> Steve

Big Sis recently sold 3 on Ebay so try there. She ran a Livery yard in an
area which doesn't .. or should I say didn't have mains. She has lots and
lots of lighting.

Lee D


 
Andrew Mawson wrote:
> OK nothing to do with Landrovers but some of you chaps move in
> suitable circles to come across these things !
>
> I'm looking for a large (50KVA plus up to 150KVA) diesel 3 phase
> generator - preferably in an accoustic cabinet but beggars cannot be
> choosers.
>
> Anyone know of any standby sets being de-commissioned and looking for
> a home? Preferably in the South.

There's a 150kVA Detroit Diesel powered genset for sale here at a
latitude of 37 degrees S. That's possibly a wee bit far South for you
though. :)


--
EMB
 
andrew ive mailed you direct about one i have at work available, plus
there is most likely more available but youll need to ring my boss as
he deals in all thats stuff in a big way .
regards, ian

 

"m0bcg" <[email protected]> wrote in message
news:[email protected]...
> andrew ive mailed you direct about one i have at work available,
plus
> there is most likely more available but youll need to ring my boss
as
> he deals in all thats stuff in a big way .
> regards, ian
>

Ian,

Thanks - nothing received - did you de-spam the return address?

Andrew <at> mawson <dot> org


 
On Thu, 10 Nov 2005 07:39:12 +1300, EMB wrote:

> There's a 150kVA Detroit Diesel powered genset for sale here at a
> latitude of 37 degrees S. That's possibly a wee bit far South for
> you though. :)

Ebay has a 50kVA detroit trailer mounted but in Northumberland not
quite as far... Worth looking at ebay there are normally one or three
generators of 50 to 150kVA size at any one time.

--
Cheers [email protected]
Dave. pam is missing e-mail



 
On Wed, 9 Nov 2005 17:41:59 +0000 (UTC), "Andrew Mawson"
<andrew@no_spam_please_mawson.org.uk> wrote:

>
>Induction furnace

Do you do open days?

AJH
 

"AJH" <[email protected]> wrote in message
news:[email protected]...
> On Wed, 9 Nov 2005 17:41:59 +0000 (UTC), "Andrew Mawson"
> <andrew@no_spam_please_mawson.org.uk> wrote:
>
> >
> >Induction furnace
>
> Do you do open days?
>
> AJH

Would you be brave enough to attend one <G>

AWEM


 
Andrew Mawson wrote:
> "AJH" <[email protected]> wrote in message
> news:[email protected]...
>> On Wed, 9 Nov 2005 17:41:59 +0000 (UTC), "Andrew Mawson"
>> <andrew@no_spam_please_mawson.org.uk> wrote:
>>
>>> Induction furnace
>> Do you do open days?
>>
>> AJH
>
> Would you be brave enough to attend one <G>
>
> AWEM
>
>
Actually, I would be quite interested in seeing a small induction
furnace system
Steve
 

"Steve" <[email protected]> wrote in message
news:[email protected]...
> Andrew Mawson wrote:
> > "AJH" <[email protected]> wrote in message
> > news:[email protected]...
> >> On Wed, 9 Nov 2005 17:41:59 +0000 (UTC), "Andrew Mawson"
> >> <andrew@no_spam_please_mawson.org.uk> wrote:
> >>
> >>> Induction furnace
> >> Do you do open days?
> >>
> >> AJH
> >
> > Would you be brave enough to attend one <G>
> >
> > AWEM
> >
> >
> Actually, I would be quite interested in seeing a small induction
> furnace system
> Steve

Steve,

You would be very welcome to call by and see it - the big 'Beast'
isn't connected up yet due to absence of big generator - I have a
little 'demonstrator' that I knocked up (250 watts as opposed to
100KWatts) which doesn't melt anything (other than solder<G>), due to
it's low power but shows the principle.

I'm in Bromley by the way.

AWEM


 
Andrew Mawson wrote:

> Steve,
>
> You would be very welcome to call by and see it - the big 'Beast'
> isn't connected up yet due to absence of big generator - I have a
> little 'demonstrator' that I knocked up (250 watts as opposed to
> 100KWatts) which doesn't melt anything (other than solder<G>), due to
> it's low power but shows the principle.

Hi Andrew,

Bit of a trip to see you specially, but its technically something I'm
interested in - can you heat things up to 1700 degrees by induction
realistically ? I'd guess as 4-5 kW ?

Steve
 

"Steve" <[email protected]> wrote in message
news:[email protected]...
> Andrew Mawson wrote:
>
> > Steve,
> >
> > You would be very welcome to call by and see it - the big 'Beast'
> > isn't connected up yet due to absence of big generator - I have a
> > little 'demonstrator' that I knocked up (250 watts as opposed to
> > 100KWatts) which doesn't melt anything (other than solder<G>), due
to
> > it's low power but shows the principle.
>
> Hi Andrew,
>
> Bit of a trip to see you specially, but its technically something
I'm
> interested in - can you heat things up to 1700 degrees by induction
> realistically ? I'd guess as 4-5 kW ?
>
> Steve

Upper temperature limit is not specifically limited by the power you
apply. There are two effects happening in an induction furnace:

A/ Magnetic hysterisis - happens up to the 'currie point' of the metal
(850 C for most steels) - the violent twisting of the magnetic domains
heats the metal. Above the currie point the metal is no longer
magnetic and this effect ceases.

B/ I (squared) R heating - the charge acts as a shorted turn in a
transformer with vast circulating currents heating the metal by
resistive losses. This effect is less in better conductors like copper
and aluminium and more in steels.

Power input and radiant and conductive losses limit the temperature
that you achieve - maximum temperature is when input power and power
loss are in equilibrium. Given good thermally insulating refactory
materials and enough power there is no problem reaching 1700 C.

My 'Beast' can dissipate 100Kw in a tiny 12Kgs of stainless steel
which should melt it in quick order (if I can find a suitably rated
and price generator !!!!!)

AWEM


 
Andrew Mawson wrote:

> Power input and radiant and conductive losses limit the temperature
> that you achieve - maximum temperature is when input power and power
> loss are in equilibrium. Given good thermally insulating refactory
> materials and enough power there is no problem reaching 1700 C.

How about graphite ? Trouble is at that temperature, you need serious
radiation shielding or all the heat radiates off. And the best materials
for those are all bloody conductors.

>
> My 'Beast' can dissipate 100Kw in a tiny 12Kgs of stainless steel
> which should melt it in quick order (if I can find a suitably rated
> and price generator !!!!!)
>

What kind of power transistors feed that then ?

Steve
 
On Fri, 11 Nov 2005 10:15:31 +0000 (UTC), "Andrew Mawson"
<andrew@no_spam_please_mawson.org.uk> wrote:

>
>"AJH" <[email protected]> wrote in message
>news:[email protected]...
>> On Wed, 9 Nov 2005 17:41:59 +0000 (UTC), "Andrew Mawson"
>> <andrew@no_spam_please_mawson.org.uk> wrote:
>>
>> >
>> >Induction furnace
>>
>> Do you do open days?
>>
>> AJH
>
>Would you be brave enough to attend one <G>
>
>AWEM

Try me ;-)

AJH

 

"Steve" <[email protected]> wrote in message
news:[email protected]...
> Andrew Mawson wrote:
>
> > Power input and radiant and conductive losses limit the
temperature
> > that you achieve - maximum temperature is when input power and
power
> > loss are in equilibrium. Given good thermally insulating refactory
> > materials and enough power there is no problem reaching 1700 C.
>
> How about graphite ? Trouble is at that temperature, you need
serious
> radiation shielding or all the heat radiates off. And the best
materials
> for those are all bloody conductors.
>
> >
> > My 'Beast' can dissipate 100Kw in a tiny 12Kgs of stainless steel
> > which should melt it in quick order (if I can find a suitably
rated
> > and priced generator !!!!!)
> >
>
> What kind of power transistors feed that then ?
>
> Steve

Steve,

Graphite being an electrical conductor heats up significantly - my 250
watt 'demo' setup uses a clay/graphite crucible and it gets the
crucible hot with no charge in it.

Output semiconductors are eight whacking great thyristors (an 'H'
bridge of four series pairs) with a further two slighlty smaller ones
to turn 'off' (comutate) the bigger ones once fired into conduction.
These are chopping a DC supply (500v @ 250 amps) to give a 3000Hz
square wave, which becomes a sine wave when applied to the furnace
coil and its associated capacitors when at resonance.

AWEM


 
On or around Fri, 11 Nov 2005 23:09:48 +0000 (UTC), "Andrew Mawson"
<andrew@no_spam_please_mawson.org.uk> enlightened us thusly:

>
>"Steve" <[email protected]> wrote in message
>news:[email protected]...
>> Andrew Mawson wrote:
>> > "AJH" <[email protected]> wrote in message
>> > news:[email protected]...
>> >> On Wed, 9 Nov 2005 17:41:59 +0000 (UTC), "Andrew Mawson"
>> >> <andrew@no_spam_please_mawson.org.uk> wrote:
>> >>
>> >>> Induction furnace
>> >> Do you do open days?
>> >>
>> >> AJH
>> >
>> > Would you be brave enough to attend one <G>
>> >
>> > AWEM
>> >
>> >
>> Actually, I would be quite interested in seeing a small induction
>> furnace system
>> Steve
>
>Steve,
>
>You would be very welcome to call by and see it - the big 'Beast'
>isn't connected up yet due to absence of big generator - I have a
>little 'demonstrator' that I knocked up (250 watts as opposed to
>100KWatts) which doesn't melt anything (other than solder<G>), due to
>it's low power but shows the principle.
>
>I'm in Bromley by the way.

I notice the engineering place that does crank regrinding and so forth not
far from here has uninterupible powre supply sets (large ones) listed for
sale on his notice board. dunno details, though.
--
Austin Shackles. www.ddol-las.net my opinions are just that
"My centre is giving way, my right is in retreat; situation excellent.
I shall attack. - Marshal Foch (1851 - 1929)
 
Andrew Mawson wrote:

> Output semiconductors are eight whacking great thyristors (an 'H'
> bridge of four series pairs) with a further two slighlty smaller ones
> to turn 'off' (comutate) the bigger ones once fired into conduction.
> These are chopping a DC supply (500v @ 250 amps) to give a 3000Hz
> square wave, which becomes a sine wave when applied to the furnace
> coil and its associated capacitors when at resonance.

I thought you'd have used IGBTs - I always forget about thyristors,
because they are bastards to turn off. I don't remember the first thing
about thyristor commutated bridges - its 20 years since I did high power
electronics. From the depths of my memory I drag up the words "McMurray
inverter". Is this one ? I can't find a piccie online to check it.

Is the resonance stuff to force the waveform to be a nice low emission
sine wave then ?

Maybe we should take this discourse on power electronics to email !

Steve
 
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