Transductor
A transductor is type of
with two windings - a main winding through which an alternating current flows from the power system, and a secondary control winding which carries a small direct current. By varying the direct current, the iron core of the transductor can be arranged to saturate at different levels and thus vary the amount of reactive power absorbed.Transductors were widely used before the advent of solid-state electronics but today have been largely replaced by power electronic devices such as the
A formerly common use for Transductors was in CRT displays, to correct a distortion called
An additional use for the transductor, prior to Hall effect devices, was as a feedback transducer for large dc current measurement. The dc bus to be measured passed through the center of the toroidal iron core saturable reactor and 120vac excitation was applied to the winding around the iron core. As the current in the dc bus increased, the iron saturated more and more, which in turn allowed a higher level of ac current to flow. This ac current was then rectified as an output signal proportional to the bus current. In this manner, dc currents of 30,000 amps or more could be accurately measured without electrically bonding to the bus.
See also
References
- Say, M.G. (1954). Magnetic Amplifiers and Saturable Reactors. Electrical Engineering Progress. Newnes.