Bulletin . r L — CURRENT IN PRIMARY COIL (t,) — -CURRENT IN SECONDARY COIL (i2) I II ! \j \J n n !\ _L MAGNETIZING CURRENT (!m) Fig. 17. Current Diagram for Example 3-Secondary Reactance Fig. 18. Oscillograph Record of Primary and SecondaryCurrents in Series Transformer 40 Illinois Engineering Experiment Station reasonable values. Increasing the secondary resistance decreases butslightly the transformation ratio. Hence it may be said that in generalthe introduction of secondary resistance is very objectionable when thetransformer supplies current for a wattmeter, but is not se
Bulletin . r L — CURRENT IN PRIMARY COIL (t,) — -CURRENT IN SECONDARY COIL (i2) I II ! \j \J n n !\ _L MAGNETIZING CURRENT (!m) Fig. 17. Current Diagram for Example 3-Secondary Reactance Fig. 18. Oscillograph Record of Primary and SecondaryCurrents in Series Transformer 40 Illinois Engineering Experiment Station reasonable values. Increasing the secondary resistance decreases butslightly the transformation ratio. Hence it may be said that in generalthe introduction of secondary resistance is very objectionable when thetransformer supplies current for a wattmeter, but is not seriously ob-jectionable when the transformer supplies current for an ammeter. 3. The effect of secondary reactance, and the equivalent effect ofmagnetic leakage is to reduce the phase angle slightly, and the trans-formation ratio very considerably. 4. The phase angle increases with decreased permeability, and conse-quently in a transformer with an iron core the phase angle increases asthe line current decreases. 5. The effect of changes in frequency within a range of 10 cycles isnot generally serious. It should be pointed out, however, that in addi-tion to the effects of frequency shown in the cur
Size: 2700px × 926px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectenginee, bookyear1904
