Dubuque, IA Free Moderated Classifieds Site > OLD ADS FROM PREVIOUS YEARS
> 2009
> December
> 12+12V 25VA toroid / toroidal power transformer
12+12V 25VA toroid / toroidal power transformer
Open Circuit Test (core loss test):
TEST CONDITION: Apply variable voltage to primary coil (115V terminals) from 115-140VAC at 60Hz. No load on secondary coils.
1. Primary V = 115VAC, Primary I = .01A or core loss is 1.0Watt.
2. Primary V = 140VAC, Primary I = .01A
Short Circuit Test (copper loss test):
TEST CONDITION: Apply variable voltage to primary coil (115V terminals) from 1-20VAC at 60Hz and short circuit on secondary coils. The test result is 14.25V and 0.22A or 3.2Watt which is the maximum rated copper loss
TEST CONDITION: Apply dielectric meter between primary coils and secondary coils; and increase voltage up to 3500VAC. No initiate any spark.
TEST CONDITION: Input 115VAC 60Hz to the primary coil; parallel 2 secondary coils, 5 ohm 250W resistors as dummy load and room temperature at 25 degree C. Temperature rises 5 degree C after an hour test at load test #3.
1. Primary I = 0.01A, Secondary V = 12.0VAC at 0.0A, Power = 0 Watt
2. Primary I = 0.10A, Secondary V = 11.7VAC at 0.7A, Power = 10 Watt
3. Primary I = 0.21A, Secondary V = 11.0VAC at 1.8A, Power = 22 Watt
Dimension – 3.0†Diameter x 1.5†High.
If you have more technical questions, please visit toroid-transformer.com or e-mail to ****@yahoo.com.
