Phase-Shifting Transformer

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phase-shifting transformer

[′fāz ¦shif·tiŋ tranz‚fȯr·mər]
A transformer which produces a difference in phase angle between two circuits.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Phase-Shifting Transformer


(fazoreguliator), an electromechanical device, usually in the form of an asynchronous electric machine with a blocked phase-wound rotor. Such a machine operates as an electrical transformer and makes it possible to alter the phase shift between the voltage at the supply terminals and the voltage at the load terminals.

The stator winding, which functions as the primary winding of the transformer, is connected to a three-phase power distribution system; the rotor winding, the secondary winding, is connected to the load through slip rings. The currents in the stator winding create a rotating magnetic field, which induces emf’s in the stator and rotor windings. The phase shift between these emf s is determined by the relative position of the stator and rotor, that is, by the angle of the mutual shift of the electrical axes of the phase windings. Turning the rotor in relation to the stator by means of some mechanical device, such as a worm mechanism, results in a smooth change in the phase shift between the emf’s (and, consequently, between the primary and secondary voltages) within the range from 0° to 360°.

There are cases when it is necessary to change the voltage phase in relatively low-powered, single-phase AC circuits. In the devices used for this purpose, the rotating magnetic field is produced by two windings. If an electric capacitor is connected to the device, the magnetic flux in one of the windings can be shifted in phase relative to the flux in the other winding by one quarter of a period.

In automation, telemechanics, conversion technology, and measuring technology, the changes in phase shift between voltages or currents are produced by phase-shifting transformers that are essentially four-pole networks. Such networks, consisting of resistors, induction coils, and electric capacitors, are called phase-shift circuits or phase shifters.


Elektrotekhnicheskiispravochnik, 5thed., vol. 1. Moscow, 1974.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
One takes into considerations the test system with the quadrature booster and this system without the quadrature booster.
Impedances [[bar.z].sub.ET] and [[bar.z].sub.BT] in the model of the quadrature booster are as follows [24] :
If in the test system, there is a quadrature booster then it is on the line between bus 5 and bus 4, at bus 5.
If in the test system, there is a quadrature booster, then for each load variant, the magnitude of [V.sub.BT] is defined as: [V.sub.BT] =0.01, 0.02, 0.03, ..., 0.2, and phase shift [[delta].sub.BT]- [[delta].sub.i], is equal to -90[degrees] or 90[degrees].
The considered levels of the data redundancy are as follows: (i) the State Estimation for the Power System without the quadrature booster (SE_PS): [r.sub.1] = 1.17, [r.sub.2]=1,83, [r.sub.3] = 2.34, [r.sub.4] = 3,59; (ii) the State Estimation for the Power System with the Quadrature Booster (SE_PS+QB): [r.sub.1] = 1.03, [r.sub.2] = 1,61, [r.sub.3] = 2.06, [r.sub.4] = 3,15.
To show changes of properties of the state estimation when in the test system the quadrature booster is installed, compared to the state estimation for the test system without the quadrature booster, for both cases the investigations are made for the same load variants, levels of the data redundancy, locations of measurement systems and characteristics of small errors burdening MD.
For one location of measurement systems in the test system without the quadrature booster, 100 cases of generation of small errors burdening MD is considered.
Further, SE_PS + QB, R stands for the state estimation for the test system with the quadrature booster, when the quadrature-booster losses are taken into account.
In the investigations, influence of losses of the quadrature booster on properties of the state estimation process is considered.
In the paper, investigations of properties of the state estimation for a power system with the quadrature booster are presented.