Transformers (electrical) Transformers (electrical) An autotransformer is an electrical transformer with only one winding. The winding has at least three electrical connection points called taps. The voltage source is applied to two taps and the load is connected to two taps one of which is usually a common connection that is also connected to the source. Each tap corresponds to a different source or load voltage. In an autotransformer a portion of the same winding effectively acts as part of both the primary and secondary winding. ...more on Wikipedia about "Autotransformer"
A balun is a device designed to convert between balanced ...more on Wikipedia about "Balun"
A Buchholz relay, also called a gas relay or a sudden pressure relay, is a safety device mounted on some oil-filled power transformers and choke coils, equipped with an external overhead oil reservoir called a conservator. The Buchholz Relay is used on conservator type oil preservation systems as a protective device sensitive to events which occurs during dielectric failure inside the transformer. ...more on Wikipedia about "Buchholz relay"
In electronics, a center tap is a wire that is connected to a point half way along one of the windings of a transformer , inductor or a resistor. ...more on Wikipedia about "Center tap"
A compensation winding is an isolated coil wound into a transformer's primary to effectively create fractional numbers of turns. ...more on Wikipedia about "Compensation Winding"
Copper loss occurs in the form of heat which is produced by the electrical currents in the conductors of transformer windings. Called I squared R losses, they relate to the amount of current in the windings and the electrical resistance to the conductors. These losses are minimized by employing large diameter conductors to reduce the resistance per unit length of the wires. Copper losses are generally about twice as great as core losses in most tranformers. ...more on Wikipedia about "Copper loss"
A flyback transformer (FBT) or line output transformer (LOPT) is a type of transformer used to generate the high voltage needed for driving a cathode ray tube (CRT) or "picture tube". It converts the input voltage, usually mains voltage in the range 120 to 240 volts, to an output voltage in the range 10 to 20 kilovolts for a colour tube (or just a few kilovolts for a monochrome tube). Unlike mains transformers and audio transformers, a LOPT is designed to have windings with high inductance. This is achieved by winding the coils on a ferrite core with an air gap, which increases the reluctance of the magnetic circuit and therefore its capacity to store energy. ...more on Wikipedia about "Flyback transformer"
A hybrid coil (or bridge transformer, or sometimes hybrid) is a single transformer that has three windings, and which is designed to be configured as a circuit having four branches, (i.e. ports) that are conjugate in pairs. The primary use of a hybrid coil is to convert between 2-wire and 4-wire operation in sequential sections of a communications circuit. Such conversion is necessary when repeaters are introduced in a 2-wire circuit. ...more on Wikipedia about "Hybrid coil"
An induction coil or "spark coil" ( archaically known as a Ruhmkorff coil) is a type of disruptive discharge coil. They are passive electrical devices used to produce high voltage pulses from a low voltage DC supply. ...more on Wikipedia about "Induction coil"
An isolation transformer is a transformer, often with symmetrical windings, which is used to decouple two circuits. An isolation transformer allows an AC signal or power to be taken from one device and fed into another without electrically connecting the two circuits. Isolation transformers block transmission of DC signals from one circuit to the other, but allow AC signals to pass. They also block interference caused by ground loops. Isolation transformers with electrostatic shields are used for power supplies for sensitive equipment such as computers or laboratory instruments. ...more on Wikipedia about "Isolation transformer"
The linear variable differential transformer (LVDT) is a type of electrical transformer used for measuring linear displacement. The transformer has three solenoidal coils placed end-to-end around a tube. The centre coil is the primary, and the two outer coils are the secondaries. A cylindrical ferromagnetic core, attached to the object whose position is to be measured, slides along the axis of the tube. ...more on Wikipedia about "Linear variable differential transformer"
The Motionless Electrical Generator (MEG) is an unusual transformer, which is most notable for claims of over-unity operation (as stated by the inventors, after a predetermined switching event the "generator" operates without an application of external power). Contrary to standard transformers, a permanent magnet is included in the design and the associated circuitry shifts the operation point of the magnetic core. The MEG is alternatively pulsed to provide induced output current pulses. The United States patent office granted to the four inventors: Stephen L. Patrick, Thomas E. Bearden, James C. Hayes, and Kenneth D. Moore. ...more on Wikipedia about "Motionless Electrical Generator"
A Oudin coil (also called an Oudin Oscillator or Oudin resonator) is a disruptive discharge coil. This autotransforming resonator is named after its inventor, Paul Marie Oudin, who developed it in conjunction with Jacques d'Arsonval. ...more on Wikipedia about "Oudin coil"
Polyphase coils are electrical coils (phases) connected together in a polyphase system such as a generator or motor. In modern systems the number of phases is usually three, or a multiple of three. Each phase carries a sinusoidal alternating current whose phase is delayed relative to one of its neighbours and advanced relative to its other neighbour. The electrical angles between the phases are usually equal, and always add up to 360 degrees. For example, in a three-phase system, the phases are separated from each other by 120°. The result of such an arrangement is a rotating magnetic field that is used to convert electrical power to rotary mechanical work, or vice versa. ...more on Wikipedia about "Polyphase coil"
A pylon transformer is a transformer mounted on a pylon. Because of weight restrictions transformers for pylon transformers are only built for voltages under 30kV. ...more on Wikipedia about "Pylon transformer"
A quadrature phase booster, also known as a phase-shifting transformer, is a specialised form of transformer used to control the flow of real power on three-phase electricity transmission networks. By means of a voltage derived from the supply that is first phase-shifted by 90° (hence is in quadrature), and then re-applied to it, a phase angle is developed across the quadrature booster. It is this induced phase angle that affects the flow of power through specified circuits. Quadrature boosters thus provide a means of relieving overloads on heavily laden circuits and re-routing power via more favourable paths. ...more on Wikipedia about "Quadrature phase booster"
In telecommunication, a repeating coil is a voice-frequency transformer characterized by a closed core, a pair of identical balanced primary ( line) windings, a pair of identical but not necessarily balanced secondary (drop) windings, and low transmission loss at voice frequencies. It permits transfer of voice currents from one winding to another by magnetic induction, matches line and drop impedances, and prevents direct conduction between the line and the drop. ...more on Wikipedia about "Repeating coil"
A rotary variable differential transformer (RVDT) is a type of electrical transformer used for measuring angular displacement. ...more on Wikipedia about "RVDT"
A transformer tap is a connection point along a transformer winding that allows the number of turns to be selected. By this means, a transformer with a variable turns ratio is produced, enabling voltage regulation of the secondary side. Selection of the tap in use is made via a tap changer mechanism. ...more on Wikipedia about "Tap (transformer)"
A Tesla coil is a category of disruptive discharge coils, named after their inventor, Nikola Tesla. Tesla actually experimented with a large variety of coils and configurations, so it is difficult to describe a specific mode of construction that will meet the wants of those who ask about "Tesla" coils. Tesla coils are composed of coupled resonant electric circuits. ...more on Wikipedia about "Tesla coil"
A transformer is an electrical device that transfers energy from one electrical circuit to another by magnetic coupling, where relative motion between the parts is not required to transfer energy between the circuits. It is often used to convert between high and low voltages, for impedance transformation, and to provide electrical isolation between circuits. ...more on Wikipedia about "Transformer"
Transformer oil is a highly-refined mineral oil that is stable at high temperatures and has excellent electrical insulating properties. It was used in transformers, capacitors, fluorescent lamp ballasts and switches, etc, to insulate and suppress arcing and as a coolant. ...more on Wikipedia about "Transformer oil"
The vector group of a polyphase power transformer indicates its windings' configurations and the difference in phase angle between them. ...more on Wikipedia about "Vector group"
A zigzag transformer is a special purpose transformer. It has primary windings but no secondary winding. One application is to derive an earth reference point for Y-delta transform. Another is to control harmonic currents. ...more on Wikipedia about "Zigzag transformer"
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