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Post by Deleted on Sept 23, 2017 17:36:49 GMT
The jmsonline one is centre tapped 110v op .......not so good if you need 230v
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Post by JohnV on Sept 23, 2017 21:08:18 GMT
I would say that it is possibly both ..... the Airlink is quoted at 3.6 Kva but they do not say if this is continuous or intermittent rating ...... as they do not say, I would guess that it is the intermittent rating (at some undisclosed duty cycle). It is quite possible that it is only rated at some 2.5 Kva continuous. The JMSonline transformer has an intermittent rating of 4.5Kva and a continuous rating of 3Kva it also is in a steel as opposed to plastic case, so it could well be the same construction (toroidal) (although I notice that most of the transformers illustrated are laminated core)
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Post by Deleted on Sept 24, 2017 6:45:02 GMT
Airlink is a continuous rating.
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Post by phoenix on Sept 24, 2017 7:45:03 GMT
Airlink is a continuous rating. any idea why it is lighter?
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Post by Deleted on Sept 24, 2017 17:37:27 GMT
Airlink is a continuous rating. any idea why it is lighter? No having never seen the other one, the jms one maybe a frame transformer rather than a toroidal that would make it heavier. You did catch the fact that the jms one is 110v not 230v didn't you.
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Post by phoenix on Sept 25, 2017 5:56:01 GMT
any idea why it is lighter? No having never seen the other one, the jms one maybe a frame transformer rather than a toroidal that would make it heavier. You did catch the fact that the jms one is 110v not 230v didn't you. Well I had assumed that it was 230 volt with a centre tapping at 110 volts so I would just use the 2 ends and get 230 volts across them. More research wwith Mr Google throws up the suggestion that toroidal will be lighter than frame , answering my question, also more efficient, but also a suggestion that if the supply is wired across the phases as seems to be custom here, there will be induced dc currents in a toroidal, could this cause damage, be the cause of the failure? Graham's comment seems to rule out the GI route?
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Post by JohnV on Sept 25, 2017 6:20:28 GMT
No having never seen the other one, the jms one maybe a frame transformer rather than a toroidal that would make it heavier. You did catch the fact that the jms one is 110v not 230v didn't you. Well I had assumed that it was 230 volt with a centre tapping at 110 volts so I would just use the 2 ends and get 230 volts across them. More research wwith Mr Google throws up the suggestion that toroidal will be lighter than frame , answering my question, also more efficient, but also a suggestion that if the supply is wired across the phases as seems to be custom here, there will be induced dc currents in a toroidal, could this cause damage, be the cause of the failure? Graham's comment seems to rule out the GI route? if you look on their products list you will find ....... www.jmsonline.co.uk/product/3kva-safety-transformer/
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Post by Deleted on Sept 25, 2017 6:24:11 GMT
We dont use toroidal transformers for our delta/star applications as normally we are using 3 rather than 2 phases and the only way to do it would be to stack 3 toroids not pretty. Guess you will have to find a frame/laminated core one. Louth transformers are good but not cheap and yoy will have to specify exactly what you need.
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Post by Deleted on Sept 25, 2017 6:26:39 GMT
Well I had assumed that it was 230 volt with a centre tapping at 110 volts so I would just use the 2 ends and get 230 volts across them. More research wwith Mr Google throws up the suggestion that toroidal will be lighter than frame , answering my question, also more efficient, but also a suggestion that if the supply is wired across the phases as seems to be custom here, there will be induced dc currents in a toroidal, could this cause damage, be the cause of the failure? Graham's comment seems to rule out the GI route? if you look on their products list you will find ....... www.jmsonline.co.uk/product/3kva-safety-transformer/Except that's 3kva tool rated and not continuous ......
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Post by JohnV on Sept 25, 2017 6:30:00 GMT
Except that's 3kva tool rated and not continuous ...... Yeah but no but ....... I suspect that if you had a word with them they would probably produce whatever you actually wanted
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