Andrew Leigh
Member
Hi,
I salvaged a 24V to 220V transformer from a failed UPS (650W) as I wish to use it on an inverter I plan on building. On the 220V side there are two seperate windings, each of the same resistance, and each half of the total resistance, from this I assume that the 220V side is OK.
On the LV side my meter, when set to "diode mode" does not scream an audible warning for a dead short. Unfortunately it is an el cheapo and does not have the resolution to measure very low resistances so I thought of applying voltage to the LV side and to measure the output.
I applied 12V d.c. to the 24V side of the transformer and the leads sure got smokin' real quick so I hastily disconnected before the stuff hit the fan. Surely the magnatising current cant be that high? Would I therefore be correct in assuming that I have a shorted turn somewhere on the LV winding as neither side of the LV winding is down to earth?
How can I varifiy the integrity of the LV winding without an accurate meter / bridge?
The truth is, I will be rewinding the 24V winding with a 12V so if the winding has failed it is not material but my understanding of what is happening is.
Regards
Andrew
I salvaged a 24V to 220V transformer from a failed UPS (650W) as I wish to use it on an inverter I plan on building. On the 220V side there are two seperate windings, each of the same resistance, and each half of the total resistance, from this I assume that the 220V side is OK.
On the LV side my meter, when set to "diode mode" does not scream an audible warning for a dead short. Unfortunately it is an el cheapo and does not have the resolution to measure very low resistances so I thought of applying voltage to the LV side and to measure the output.
I applied 12V d.c. to the 24V side of the transformer and the leads sure got smokin' real quick so I hastily disconnected before the stuff hit the fan. Surely the magnatising current cant be that high? Would I therefore be correct in assuming that I have a shorted turn somewhere on the LV winding as neither side of the LV winding is down to earth?
How can I varifiy the integrity of the LV winding without an accurate meter / bridge?
The truth is, I will be rewinding the 24V winding with a 12V so if the winding has failed it is not material but my understanding of what is happening is.
Regards
Andrew