An induction regulator adjusts output voltage by varying inductive coupling between primary and secondary windings. It can produce a continuously adjustable output voltage and is used in electric arc welding. Phase shifted power transformers alter transmission line loads to prevent overloading.
An induction regulator is a device that provides an adjustable output voltage by varying the inductive coupling between a primary and secondary or driven winding. It is very similar to an induction motor in construction. Unlike an induction motor, however, the induction governor’s rotor is stationary while set at the desired electrical energy transfer rate.
Electrical transformers use electromagnetic induction to transfer electrical energy from the primary to the secondary winding. The primary winding is compared to the stator in the motor, while the secondary winding is compared to the rotor. Unlike normal electric transformers with a fixed geometry magnetic core, the induction regulator has primary poles where the primary energy is transformed into magnetic field intensity. The strength of the magnetic field and the resulting voltage ratio between rotor and stator are also determined by the proximity or proximity of the fixed and moving magnetic core.
The voltage transfer ratio and power transfer ratio are controllable in the induction regulator. By linking the rotor to a gear system, the required voltage or power transfer ratio between the rotor and stator can be manually or remotely adjusted. The induction regulator is available in three-phase and single-phase versions.
Phase shifted power transformers (PSPT) have an adjustable impedance, resulting in a variable phase output. The voltage shifted by PSPTs can be used to alter transmission line loads which can prevent overloading of generators and the transmission line. For example, if two parallel transmission lines from a generator loaded to 50 megawatts (MW) are each carrying 25 MW, the PSPT can be installed on one of the transmission lines to produce a phase shift which can result in 40 MW on one leg and 10 MW good with the PSPT. The result is the ability to control how much power is drawn on each leg of the transmission line.
The induction regulator is capable of producing a continuously adjustable output voltage, while a tap transformer is capable of providing some discrete voltage choices. In the laboratory, a variac is capable of outputting an almost continuously adjustable voltage output. The induction regulator can output from 0 to 110 volts of alternating current (VAC), while the tap transformer can have taps that allow access to voltages such as 0, 55, and 110 VAC.
Electric arc welding uses electrothermal and electrical energy to maintain the plasma at a temperature that melts most available building metals. Using an induction regulator, the optimum power required for best results can be maintained in the form of a plasma that continuously melts the metal being worked at a prescribed rate. With this regulator, the relatively high power electric control capability needed in arc welding is economically feasible.
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