1949:
their magnetic fields pointed in the same direction, the two magnetic fields add, and the inductance is maximum. If the inner coil is rotated so its axis is at an angle to the outer coil, the magnetic fields do not add and the inductance is less. If the inner coil is rotated so it is collinear with the outer coil but their magnetic fields point in opposite directions, the fields cancel each other out and the inductance is very small or zero. The advantage of the variometer is that inductance can be adjusted continuously, over a wide range. Variometers were widely used in 1920s radio receivers. One of their main uses today is as antenna matching coils to match
306:
1037:
271:
1048:
2930:
1133:, and a high open-circuit inductance. In power-type pulse transformers, a low coupling capacitance (between the primary and secondary) is important to protect the circuitry on the primary side from high-powered transients created by the load. For the same reason, high insulation resistance and high breakdown voltage are required. A good transient response is necessary to maintain the rectangular pulse shape at the secondary, because a pulse with slow edges would create
797:, replacing the turns of wire used to make other types. Some planar transformers are commercially sold as discrete components, other planar transformers are etched directly into the main printed circuit board and only need a ferrite core to be attached over the PCB. A planar transformer can be thinner than other transformers, which is useful for low-profile applications or when several printed circuit boards are stacked. Almost all planar transformers use a ferrite
775:
1620:
211:
813:, which cools and insulates. Oil circulates through ducts in the coil and around the coil and core assembly, moved by convection. The oil is cooled by the outside of the tank in small ratings, and by an air-cooled radiator in larger ratings. Where a higher rating is required, or where the transformer is in a building or underground, oil pumps circulate the oil, fans may force air over the radiators, or an oil-to-water heat exchanger may also be used.
82:
158:
263:
119:
2104:(CRTs). It provides the high (often several kV) anode DC voltage required for operation of CRTs. Variations in anode voltage supplied by the flyback can result in distortions in the image displayed by the CRT. CRT flybacks may contain multiple secondary windings to provide several other, lower voltages. Its output is often pulsed because it is often used with a voltage multiplier, which may be integrated with the flyback.
1612:
41:
767:
65:
53:
911:
1773:
198:
power rating. It is calculated by: load VA × (|Vin – Vout|)/Vin. For example, an auto transformer that adapts a 1000 VA load rated at 120 volts to a 240 volt supply has an equivalent rating of at least: 1,000 VA (240 V – 120 V) / 240 V = 500 VA. However, the actual rating (shown on the tally plate) must be at least 1000 VA.
1855:
1937:
896:, etc. or a colored spot or dot impressed in the case) indicate one end of each winding, indicating the same instantaneous polarity and phase between windings. This applies to both types of instrument transformers. Correct identification of terminals and wiring is essential for proper operation of metering and protective relay instrumentation.
282:, multiple single-phase transformers can be used, or all phases can be connected to a single polyphase transformer. For a three phase transformer, the three primary windings are connected together and the three secondary windings are connected together. Examples of connections are wye-delta, delta-wye, delta-delta, and wye-wye. A
1418:" is used because the equal and opposite (anti-parallel, balanced) currents in the coax or paired wires cancel each others' magnetic fields, allowing them to pass through unhindered, but magnetic field of the unbalanced flow inhibits the unbalanced current, "choking" it off. Similar reasoning applies to the name "line isolator".
1003:
an accurate voltage ratio to enable accurate metering. A potential transformer may have several secondary windings on the same core as a primary winding, for use in different metering or protection circuits. The primary may be connected phase to ground or phase to phase. The secondary is usually grounded on one terminal.
385:
1523:. One may exploit this behavior to transform currents and voltages by connecting sections of transmission line with mismatched impedances to deliberately create a standing wave on a line, and the cut and reconnect to the line at the position where a desired impedance is reached – never requiring more than a
1576:(grounded) circuits. They can be made using any transformer type, but the actual balance achieved depends on the type; for example, "choke" baluns produce balanced current and autotransformer-type baluns produce balanced voltages. Baluns can also be made from configurations of transmission line, using
1002:
Voltage transformers (VT), also called potential transformers (PT), are a parallel connected type of instrument transformer, used for metering and protection in high-voltage circuits or phasor phase shift isolation. They are designed to present negligible load to the supply being measured and to have
1970:
The pancake coil variometer was another common construction used in both 1920s receivers and transmitters. It consists of two flat spiral coils suspended vertically facing each other, hinged at one side so one could swing away from the other to an angle of 90° to reduce the coupling. The flat spiral
1927:
Enameled copper wire is wound round the central half of the length of a bundle of insulated iron wire (e.g., florists' wire), to make the windings. The ends of the iron wires are then bent around the electrical winding to complete the magnetic circuit, and the whole is wrapped with tape or string to
141:
Small appliance and electronic transformers may use a split bobbin, giving a high level of insulation between the windings. The rectangular cores are made up of stampings, often in E-I shape pairs, but other shapes are sometimes used. Shields between primary and secondary may be fitted to reduce EMI
1006:
There are three primary types of voltage transformers (VT): electromagnetic, capacitor, and optical. The electromagnetic voltage transformer is a wire-wound transformer. The capacitor voltage transformer uses a capacitance potential divider and is used at higher voltages due to a lower cost than an
950:
core wrapped with many turns of wire. The CT is typically described by its current ratio from primary to secondary. For example, a 1000:1 CT provides an output current of 1 amperes when 1000 amperes flow through the primary winding. Standard secondary current ratings are 5 amperes or 1 ampere,
876:
Instrument transformers are typically used to operate instruments from high voltage lines or high current circuits, safely isolating measurement and control circuitry from the high voltages or currents. The primary winding of the transformer is connected to the high voltage or high current circuit,
513:
value is an important parameter that determines the resonance frequency of the resonant transformer. Often only secondary winding has a resonant capacitor (or stray capacitance) and acts as a serial resonant tank circuit. When the short-circuit inductance of the secondary side of the transformer is
197:
consists of only one winding that is tapped at some point along the winding. Voltage is applied across a terminal of the winding, and a higher (or lower) voltage is produced across another portion of the same winding. The equivalent power rating of the autotransformer is lower than the actual load
1804:
speaker systems (the voltage corresponding to the power rating of a speaker or amplifier). A transformer steps up the output of the system's amplifier to the distribution voltage. At the distant loudspeaker locations, a step-down transformer matches the speaker to the rated voltage of the line, so
833:
Cast-resin power transformers encase the windings in epoxy resin. These transformers simplify installation since they are dry, without cooling oil, and so require no fire-proof vault for indoor installations. The epoxy protects the windings from dust and corrosive atmospheres. However, because the
1948:
with two windings. One common form consisted of a coil wound on a short hollow cylindrical form, with a second smaller coil inside, mounted on a shaft so its magnetic axis can be rotated with respect to the outer coil. The two coils are connected in series. When the two coils are collinear, with
955:
points to provide a range of ratios. Care must be taken to make sure the secondary winding is not disconnected from its low-impedance load while current flows in the primary, as this may produce a dangerously high voltage across the open secondary and may permanently affect the accuracy of the
396:
than other transformers, sometimes increased by a magnetic bypass or shunt in its core between primary and secondary, which is sometimes adjustable with a set screw. This provides a transformer with an inherent current limitation due to the loose coupling between its primary and the secondary
846:
links two circuits magnetically, but provides no metallic conductive path between the circuits. An example application would be in the power supply for medical equipment, when it is necessary to prevent any leakage from the AC power system into devices connected to a patient. Special purpose
739:
tank circuit (a capacitor and an additional winding), a transformer can be arranged to automatically keep the secondary winding voltage relatively constant for varying primary supply without additional circuitry or manual adjustment. Ferro-resonant transformers run hotter than standard power
335:
supplies accommodate phase to neutral loads by providing a return path for current to a neutral. Grounding transformers most commonly incorporate a single winding transformer with a zigzag winding configuration but may also be created with a wye-delta isolated winding transformer connection.
201:
For voltage ratios that don't exceed about 3:1, an autotransformer is cheaper, lighter, smaller, and more efficient than an isolating (two-winding) transformer of the same rating. Large three-phase autotransformers are used in electric power distribution systems, for example, to interconnect
2061:
The two-phase resolver and related three-phase synchro are rotary position sensors which work over a full 360°. The primary is rotated within two or three secondaries at different angles, and the amplitudes of the secondary signals can be decoded into an angle. Unlike variable differential
861:
A solid-state transformer is actually a power converter that performs the same function as a conventional transformer, sometimes with added functionality. Most contain a smaller high-frequency transformer. It can consist of an AC-to-AC converter, or a rectifier powering an inverter.
1495:
Single frequency transformers are made using sections of transmission line, often called a "matching section" or a "matching stub". Like the choke transformer above, it is also called a "transmission line transformer" even though the two are very different in form and operation.
740:
transformers, because regulating action depends on core saturation, which reduces efficiency. The output waveform is heavily distorted unless careful measures are taken to prevent this. Saturating transformers provide a simple rugged method to stabilize an AC power supply.
1007:
electromagnetic VT. An optical voltage transformer exploits the electrical properties of optical materials. Measurement of high voltages is possible by the potential transformers. An optical voltage transformer is not strictly a transformer, but a sensor similar to a
1147:
The product of the peak pulse voltage and the duration of the pulse (or more accurately, the voltage-time integral) is often used to characterise pulse transformers. Generally speaking, the larger this product, the larger and more expensive the transformer.
993:
uses a current transformer with a split core that can be easily wrapped around a conductor in a circuit. This is a common method used in portable current measuring instruments but permanent installations use more economical types of current transformer.
643:
2042:
A variable differential transformer is a rugged non-contact position sensor. It has two oppositely-phased primaries which nominally produce zero output in the secondary, but any movement of the core changes the coupling to produce a signal.
1821:
Moving coil phonograph cartridges produce a very small voltage. For this to be amplified with a reasonable signal-noise ratio usually requires a transformer to convert the voltage to the range of the more common moving-magnet cartridges.
847:
isolation transformers may include shielding to prevent coupling of electromagnetic noise between circuits, or may have reinforced insulation to withstand thousands of volts of potential difference between primary and secondary circuits.
169:
transformers save space compared to E-I cores, and may reduce external magnetic field. These use a ring shaped core, copper windings wrapped around this ring (and thus threaded through the ring during winding), and tape for insulation.
173:
Toroidal transformers have a lower external magnetic field compared to rectangular transformers, and can be smaller for a given power rating. However, they cost more to make, as winding requires more complex and slower equipment.
1740:). When the incoming signal amplitude is very high the transformer saturates and adds harmonics from soft clipping. Another non-linearity comes from limited frequency response. For good low-frequency response a relatively large
821:, but because these compounds persist in the environment and have adverse effects on organisms, their use has been discontinued in most areas; for example, after 1979 in South Africa. Substitute fire-resistant liquids such as
1841:, an inverted signal is required and can be obtained from a transformer with a center-tapped winding, used to drive two active devices in opposite phase. These phase splitting transformers are not much used today.
1763:
audio power amplifiers often had output transformers, but they were eliminated as advances in semiconductors allowed the design of amplifiers with sufficiently low output impedance to drive a loudspeaker directly.
1182:
Laminated steel used for power transformer cores is very inefficient at RF, wasting a lot of RF power as heat, so transformers for use at radio frequencies tends to use magnetic ceramics for winding cores, such as
926:
A current transformer (CT) is a series connected measurement device designed to provide a current in its secondary coil proportional to the current flowing in its primary. Current transformers are commonly used in
816:
Transformer oil is flammable, so oil-filled transformers inside a building are installed in vaults to prevent spread of fire and smoke from a burning transformer. Some transformers were built to use fire-resistant
834:
molds for casting the coils are only available in fixed sizes, the design of the transformers is less flexible, which may make them more costly if customized features (voltage, turns ratio, taps) are required.
1603:. They are mostly tuned transformers, containing a threaded ferrite slug that is screwed in or out to adjust IF tuning. The transformers are usually canned (shielded) for stability and to reduce interference.
1019:
A combined instrument transformer encloses a current transformer and a voltage transformer in the same transformer. There are two main combined current and voltage transformer designs: oil-paper insulated and
1731:
to the original signal, especially odd-order harmonics, with an emphasis on third-order harmonics. When the incoming signal amplitude is very low there is not enough level to energize the magnetic core (see
1587:
In addition to interfacing between balanced and unbalanced loads by producing balanced current or balanced voltage (or both), baluns can in addition separately transform (match) impedance between the loads.
1399:
The name "transmission-line" is used because actual coaxial line is sometimes used, and when paired wires are used, the builder is expected to take special care with the wire spacing, to ensure that the
372:
is a specialized three-phase power transformer which allows the phase relationship between the input and output windings to be continuously adjusted by rotating one half. They are used to interconnect
1689:
Audio transformers were originally designed to connect different telephone systems to one another while keeping their respective power supplies isolated, and are still commonly used to interconnect
1242:
So-called “air-core” transformers actually have no core at all – they are wound onto non-magnetic forms or frames, or merely held in shape by the stiffness of the coiled wire. These are used for
254:. The major advantage of the induction regulator is that unlike variacs, they are practical for transformers over 5 kVA. Hence, such regulators find widespread use in high-voltage laboratories.
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2434:
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per turn, requiring many turns of wire on the transformer coil. All forward current excites reverse current and induces secondary voltage which is proportional to the mutual inductance. At
1805:
the speaker produces rated nominal output when the line is at nominal voltage. Loudspeaker transformers commonly have multiple primary taps to adjust the volume at each speaker in steps.
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systems or system components, to eliminate buzz and hum. Such transformers typically have a 1:1 ratio between the primary and the secondary. These can also be used for splitting signals,
246:
but it is essentially a transformer whose output voltage is varied by rotating its secondary relative to the primary—i.e., rotating the angular position of the rotor. It can be seen as a
177:
They can be mounted by a bolt through the center, using washers and rubber pads or by potting in resin. Care must be taken that the bolt does not form part of a short-circuit turn.
1724:. (The valves can deliver a low current at a high voltage; the speakers require high current at low voltage.) Most solid-state power amplifiers need no output transformer at all.
1421:
It is called a "current balun" or "current transformer" because the transformed flow produces balanced currents, rather than balanced voltages typical of other transformer types.
93:" for the external delta closure in a Knapsack connection. The transformers are immersed in oil for cooling and insulation, and are designed to withstand frequent short circuits.
89:, the transformer has a heavy copper bus for the low voltage winding, which can be rated for tens of thousands of amperes. Winding beginnings and ends are led out separately and
294:), the earth connection point is usually the center point of a wye winding. If the secondary is a delta winding, the ground may be connected to a center tap on one winding (
1203:). The core material a coil is wrapped around can increase its inductance dramatically – hundreds to thousands of times more than “air” – thereby raising the transformer's
532:
2016:
A rotary (rotatory) transformer is a specialized transformer that couples electrical signals between two parts that rotate in relation to each other—as an alternative to
1028:
footprint, due to reduced number of transformers in a bay, supporting structures and connections as well as lower costs for civil works, transportation and installation.
1813:
Valve (tube) amplifiers almost always use an output transformer to match the high load impedance requirement of the valves (several kilohms) to a low impedance speaker
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652:
circuit. Each pulse serves to drive resonant sinusoidal oscillations in the tuned winding, and due to resonance a high voltage can be developed across the secondary.
2548:
1663:. Audio transformers that operate with loudspeaker voltages and current are larger than those that operate at microphone or line level, which carry much less power.
2748:
2069:
which are useful for computation. Synchros produce three-phase signals which can be connected to other synchros to rotate them in a generator/motor configuration.
1784:
transformers can power many individual loudspeakers from a single audio circuit operated at higher than normal loudspeaker voltages. This application is common in
1059:
is a transformer that is optimised for transmitting rectangular electrical pulses (that is, pulses with fast rise and fall times and a relatively constant
350:
This is a specialized type of transformer which can be configured to adjust the phase relationship between input and output. This allows power flow in an
2465:
2420:
1716:. Valve circuits for quality reproduction have long been produced with no other (inter-stage) audio transformers, but an output transformer is needed to
1322:. Different mixtures respond best at different frequencies. Because they are ceramics, ferrites are (almost) non-conductive, so they respond only to the
1967:
with variable coupling. The inner coil could be rotated from 0° to 90° angle with the outer, reducing the mutual inductance from maximum to near zero.
720:
and insulation testing of high voltage equipment and cables. In the latter case, the transformer's secondary is resonated with the cable's capacitance.
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3024:
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was a device with similar construction, but the two coils were not connected but attached to separate circuits. So it functioned as an air-core RF
1674:
Being magnetic devices, audio transformers are susceptible to external magnetic fields such as those generated by AC current-carrying conductors. "
228:, an autotransformer with a near-continuously variable turns ratio can be obtained, allowing for wide voltage adjustment in very small increments.
1643:. They can be used to block radio frequency interference or the DC component of an audio signal, to split or combine audio signals, or to provide
758:
Ferrite transformers are not used as power transformers at mains frequency since laminated iron cores cost less than an equivalent ferrite core.
1452:
can provide impedance matching between circuits over a limited range of frequencies, using only a section of transmission line no more than a
101:
are made for different purposes. Despite their design differences, the various types employ the same basic principle as discovered in 1831 by
2645:
2177:
404:
The output and input currents are kept low enough to preclude thermal overload under any load conditions — even if the secondary is shorted.
1744:
is required; high power handling increases the required core size. Good high-frequency response requires carefully designed and implemented
2797:
1682:" power supply (typically 50 or 60 Hz). Audio transformers used for low-level signals, such as those from microphones, often include
134:
to low voltage to power electronic devices. They are available in power ratings ranging from mW to MW. The insulated laminations minimize
1623:
Five audio transformers for various line level purposes. The two black boxes on the left contain 1:1 transformers for splitting signals,
1546:
This type of transformer is very efficient (very little loss) but severely limited in the frequency span it will operate on: Whereas the
2892:
2741:
2516:
2479:
755:(SMPSs). The powder core enables high-frequency operation, and hence much smaller size-to-power ratio than laminated-iron transformers.
305:
166:
1924:
Hedgehog transformers are occasionally encountered in homemade 1920s radios. They are homemade audio interstage coupling transformers.
1720:
the relatively high impedance (up to a few hundred ohms depending upon configuration) of the output valve(s) to the low impedance of a
2066:
1872:
1631:; each one contains a 1:1 line transformer, the first is rated at 600 ohms, the second is rated at 15,000 ohms. On the far right is a
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transformers, the coils, and not just the core, move relative to each other, so slip rings are required to connect the primary.
1615:
Two speaker-level audio transformers in a tube amplifier are seen on the left. The power supply toroidal transformer is on right
1789:
1179:(RF) work, distinguished by how their windings are connected, and by the type of cores (if any) the coil turns are wound onto.
694:
3182:
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2914:
2734:
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shielded to minimise noise pickup. These transformers are less widely used today, as transistorized buffers are now cheaper.
1635:; its 12:1 transformer (with yellow insulation) changes a high impedance unbalanced input to a low impedance balanced output.
363:
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to be controlled, e.g. to steer power flows away from a shorter (but overloaded) link to a longer path with excess capacity.
1036:
2334:
ANSI IEEE Standard C57.12.00 General
Requirements for Liquid-Immersed Distribution, Power and Regulating Transformers, 2000
2172:
G. Volkert, K.-D. Frank (1972) "Metallurgie der
Ferrolegierungen", page 131, Springer Verlag, Berlin, Heidelberg, New York
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421:
224:
By exposing part of the winding coils of an autotransformer, and making the secondary connection through a sliding carbon
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2842:
302:. There are many possible configurations that may involve more or fewer than six windings and various tap connections.
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In the same way that transformers create high voltage power transmission circuits that minimize transmission losses,
3187:
2143:
1627:, or isolating two different AC ground systems to eliminate buzz and hum. The two cylindrical metal cases fit into
1431:
1352:" transformers are sometimes made from windings of transmission line wired in parallel. Sometimes the windings are
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but only a limited number of impedance ratios (such as 1:1, 1:4, or 1:9) can be achieved with this technique.
1047:
809:
Large transformers used in power distribution or electrical substations have their core and coils immersed in
2611:
877:
and the meter or relay is connected to the secondary circuit. Instrument transformers may also be used as an
3054:
2961:
2907:
1165:; whatever energy stored in the coil during the pulse must be "dumped" out before the pulse is fired again.
978:
systems. One type provides a voltage output that is proportional to the measured current. Another, called a
856:
251:
1492:
interferes with proper operation, it is usually the only feasible method for transforming line impedances.
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1717:
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compatible with standard measuring instruments. The secondary winding can be single ratio or have several
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for TV and radio antennas. Because of the enormous improvement in inductance that ferrite produces, many
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1972:
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transformer is a transformer in which one or both windings has a capacitor across it and functions as a
1994:(output) circuit. It fed back some of the signal from the plate circuit into the input again, and this
298:) or one phase may be grounded (corner grounded delta). A special purpose polyphase transformer is the
2782:
2662:
1979:
1508:
1228:
1115:
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638:{\displaystyle \omega _{s}={\frac {1}{\sqrt {L_{sc}C_{r}}}}={\frac {1}{\sqrt {(1-k^{2})L_{s}C_{r}}}}}
319:
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424:, which are series connected up to 7.5 kV AC). It acts both as a voltage transformer and as a
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Old RF transformers sometimes included an extra, third coil (called a tickler winding) to inject
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393:
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The unregulated d.c. voltage is applied in the form of pulses to a resonant transformer T1602...
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built into the winding, to shut-off power at high temperatures to prevent further overheating.
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T. J. Gallagher and A. J. Pearmain (1983): "High
Voltage - Measurement, Testing and Design",
1916:. A transactor has an iron core with an air-gap, which limits the coupling between windings.
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1209:. The cores of such transformers tend to help performance the most at the lower end of the
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To minimize distortion of the pulse shape, a pulse transformer needs to have low values of
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Transformer with three windings. The dots show the relative configuration of the windings.
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1568:"Balun" is a generic name for any transformer configured specifically to connect between
392:
A leakage transformer, also called a stray-field transformer, has a significantly higher
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Current transformers are often constructed by passing a single primary turn (either an
736:
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146:
1792:. Such systems are also known by the nominal voltage of the loudspeaker line, such as
1697:, or feeding a balanced signal to unbalanced equipment. Transformers are also used in
1639:
Audio transformers are those specifically designed for use in audio circuits to carry
3176:
3115:
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2078:
1741:
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Ferrite-core transformers are widely used in (intermediate frequency) (IF) stages in
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By arranging particular magnetic properties of a transformer core, and installing a
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The transformer is driven by a pulse or square wave for efficiency, generated by an
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220 kV and 33 kV sub-transmission networks or other high voltage levels.
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Audio transformers affect the sound quality because they are non-linear. They add
1705:) to low impedance signals to enable them to connect to a microphone input on the
1364:, powdered iron, or "air" core. This style of transformer gives an extremely wide
881:
so that secondary quantities may be used without affecting the primary circuitry.
1825:
Microphones may also be matched to their load with a small transformer, which is
1659:, or between a high impedance instrument output and the low impedance input of a
1261:, such transformers may be nothing more than a few turns of wire soldered onto a
1102:
industry to interface low-voltage control circuitry to the high-voltage gates of
3085:
2887:
2827:
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Pancake or "honeycomb" coil vario-couplers were used in the 1920s in the common
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2084:
can be mechanically coupled or integrated in one piece of material, creating a
1584:
cable similar to transmission line transformers in construction and operation.
3110:
3095:
2787:
2118:
2081:
2017:
1760:
1733:
1540:
1512:
1477:
1469:
1303:
1254:
1188:
1152:
983:
688:
684:
674:
454:
417:
1678:" is a term commonly used to describe unwanted signals originating from the "
1391:. Although called a "transmission line" transformer, it is distinct from the
2100:
is a high-voltage, high-frequency transformer used in plasma balls and with
1675:
1473:
1311:
1247:
1200:
1192:
1060:
518:
and the resonant capacitor (or stray capacitance) of the secondary side is C
460:
376:
with the same nominal frequency but without synchronous phase coordination.
1745:
142:(electromagnetic interference), or a screen winding is occasionally used.
3146:
2832:
2517:"The combined transformer - an optimal solution för HV substations, p. 1"
1950:
1945:
1913:
1826:
1569:
1217:
1204:
1184:
1076:
971:
960:
822:
789:
Manufacturers either use flat copper sheets or etch spiral patterns on a
472:
436:
1990:
circuit. The other coil, the "tickler" coil was connected to the tube's
3156:
2882:
2358:
Guidelines for the
Identification of PCBs and Materials Containing PCBs
2056:
2020:, which are prone to wear and contact noise. They are commonly used in
1936:
1879: in this section. Unsourced material may be challenged and removed.
1632:
1581:
1577:
1357:
1353:
1299:
505:, and high voltage power supplies. They are also used in some types of
30:
2726:
1698:
1668:
1319:
287:
478:. The transformer windings have either air or ferrite cores and the
1110:
pulse transformers are also used to generate high power pulses for
2772:
1935:
1771:
1618:
1610:
1563:
1489:
1307:
1111:
1046:
1035:
947:
909:
383:
304:
261:
209:
156:
117:
80:
2480:"Measurement Canada Standard Dwg. No.3400 D3 Delta Connected CTs"
2364:. United Nations Environment Programme. p. 2. Archived from
1712:
A particularly critical component is the output transformer of a
3161:
2317:
1315:
1276:
transformers are widely used in RF transformers, especially for
785:(the spiral secondary "winding" is on the other side of the PCB)
432:
384:
2730:
2663:"Analogue Warmth – The Sound Of Tubes, Tape & Transformers"
3131:
1848:
1485:
1481:
1024:
insulated. One advantage of applying this solution is reduced
242:
The induction regulator is similar in design to a wound-rotor
1651:
and low impedance circuits, such as between a high impedance
290:
difference between them. If a winding is connected to earth (
2318:"700+ Multiphysics Examples with Solutions and Instructions"
2252:
Philips PM3311 Oscilloscope service manual
Section 6.2.16 ,"
1944:
A variometer is a type of continuously variable air-core RF
1686:
to protect against extraneous magnetically coupled signals.
126:
This is the most common type of transformer, widely used in
1306:(rust) mixed with small fractions of other metals or their
946:
cable or an uninsulated bus bar) through a well-insulated
2576:(2nd ed.). New Delhi: Tata McGraw-Hill. p. 76.
2204:
Standard
Handbook for Electrical Engineers, 11th Edition
1788:
applications. Such circuits are commonly referred to as
1432:
Distributed-element filter § Stub band-pass filters
1253:
The lack of a magnetically reactive core means very low
145:
Small appliance and electronics transformers may have a
884:
Terminal identifications (either alphanumeric such as H
309:
Three-phase transformers 380 kV/110 kV and 110 kV/20 kV
2680:
2640:(6th ed.). Oxford, UK: Focal Press. p. 356.
1083:. These are also called Ethernet transformer modules.
2267:"11kW, 70kHz LLC Converter Design for 98% Efficiency"
1912:
A transactor is a combination of a transformer and a
731:
Voltage regulator § Constant-voltage transformer
535:
1701:
to convert high-impedance instrument signals (e.g.,
1393:
transformers made from segments of transmission line
1392:
1376:
1090:
versions are used in power-control circuits such as
286:
indicates the configuration of the windings and the
3124:
3078:
2937:
2765:
1554:, a line section transformer is very narrowbanded.
1292:transformers work well with only one or two turns.
781:: the spiral primary "winding" on one side of the
637:
1360:(paired parallel wire); either is wound around a
70:Transformer with electrostatic screen preventing
2549:"Combined instrument transformer, PVA 123, p. 2"
1986:. One coil was connected to the detector tube's
1472:long. The line may be coaxial cable, waveguide,
220:Autotransformer § Variable autotransformers
2684:. London: Institution of Electrical Engineers.
1511:along its length, repeating exactly every full
1175:There are several types of transformer used in
2202:Donald G. Fink & H. Wayne Beatty. (1978).
687:(or Oudin resonator; named after its inventor
2742:
1756:. All this makes for an expensive component.
1547:
1377:different transformer type with the same name
471:, resonant transformers can function as high
46:Transformer with two windings and iron core.
8:
2709:. Chandler, Ariz.: Sonoran Pub. p. 76.
2596:: CS1 maint: multiple names: authors list (
998:Voltage transformer or potential transformer
494:. They are also used in radio transmitters.
2243:", Agile Magnetics, retrieved June 8, 2016.
1436:Antenna tuner § stub & section matching
1326:created by nearby currents, and not to the
986:in order to provide a proportional output.
431:Other applications are short-circuit-proof
266:A high-voltage transformer being dismantled
2749:
2735:
2727:
1407:of the coax or paired wires lies near the
105:, and share several key functional parts.
1895:Learn how and when to remove this message
626:
616:
603:
584:
572:
559:
549:
540:
534:
482:can be adjusted by varying the coupling (
3045:Rotary variable differential transformer
3025:Linear variable differential transformer
2636:Rumsey, Francis; McCormick, Tim (2009).
2038:Rotary variable differential transformer
2034:Linear variable differential transformer
1371:Choke transformers are sometimes called
1151:Pulse transformers by definition have a
773:
765:
269:
27:Overview of electrical transformer types
2572:Khanchandani, M.D. Singh, K.B. (2008).
2165:
1940:Variometer used in 1920s radio receiver
497:Resonant transformers are also used in
274:Cutaway view of a polyphase transformer
2589:
2464:: CS1 maint: archived copy as title (
2457:
2419:: CS1 maint: archived copy as title (
2412:
2299:
2288:
1330:created by the accompanying voltages.
1298:is an intensely magnetically reactive
1079:, often for matching logic drivers to
751:power transformers are widely used in
455:Tesla coil § Resonant transformer
401:acts as a current limiting parameter.
2344:Distributed Transformer Manufacturers
7:
2798:Condition monitoring of transformers
2616:Virtual Institute of Applied Science
1877:adding citations to reliable sources
1776:Loudspeaker transformer in old radio
2893:Toroidal inductors and transformers
2504:Network Protection & Automation
1833:Interstage and coupling transformer
1411:of the input and output impedances.
963:CTs are also used, usually with an
2067:in-phase and quadrature components
1450:quarter-wave impedance transformer
416:and high voltage discharge lamps (
412:Leakage transformers are used for
380:Leakage or stray field transformer
25:
2028:Variable differential transformer
1975:and losses at radio frequencies.
1515:, and covering its full range of
1281:
2928:
2707:Radio manufacturers of the 1920s
2661:Robjohns, Hugh (February 2010).
2275:10.1109/COMPEL49091.2020.9265771
2190:"The basics of autotransformers"
1853:
1790:constant-voltage speaker systems
63:
51:
39:
1864:needs additional citations for
1507:will produce standing waves of
1499:Unless it is terminated in its
1015:Combined instrument transformer
492:superheterodyne radio receivers
3065:Variable-frequency transformer
2915:Transformer utilization factor
1373:transmission-line transformers
1213:transformer was designed for.
1051:Inside an Ethernet transformer
664:superheterodyne radio receiver
609:
590:
486:). One common form is the IF (
422:cold cathode fluorescent lamps
370:variable-frequency transformer
364:Variable-frequency transformer
358:Variable-frequency transformer
1:
1144:in the power semiconductors.
1100:electrical power distribution
922:400 ampere electricity supply
914:Current transformers used in
2974:Energy efficient transformer
2024:magnetic tape applications.
1984:regenerative radio receivers
1695:balancing unbalanced signals
1625:balancing unbalanced signals
793:to form the "windings" of a
753:switched-mode power supplies
725:Constant voltage transformer
97:Various types of electrical
2979:Amorphous metal transformer
2863:Resonant inductive coupling
2803:Electrical insulation paper
2241:3-Phase Step-Up Transformer
1932:Variometer and variocoupler
1655:output and a low impedance
825:oils are now used instead.
522:, The resonance frequency ω
449:Resonant inductive coupling
128:electric power transmission
3204:
2144:Three-phase electric power
2050:
2031:
2009:
1561:
1429:
1375:(although see below for a
1337:
974:or pulsed currents within
903:
869:
854:
728:
452:
446:
361:
343:
340:Phase-shifting transformer
317:
235:
217:
184:
130:and appliances to convert
122:Laminated core transformer
2926:
2214:pp. 10–44 and 10–45.
2086:piezoelectric transformer
2073:Piezoelectric transformer
1426:Line section transformer
1098:versions are used in the
1063:). Small versions called
1043:TS6121A pulse transformer
937:electrical power industry
805:Liquid-cooled transformer
435:transformers for toys or
397:windings. The adjustable
138:losses in the iron core.
2957:Distribution transformer
1971:design served to reduce
1817:Small-signal transformer
1671:communication circuits.
1501:characteristic impedance
1488:frequencies, where coil
1269:Ferrite-core transformer
511:short-circuit inductance
507:switching power supplies
399:short-circuit inductance
252:rotating magnetic fields
214:Variable autotransformer
206:Variable autotransformer
3055:Solid-state transformer
2962:Pad-mounted transformer
2908:Transformer oil testing
2682:Power system protection
2612:"Air core transformers"
2355:UNEP Chemicals (1999).
1768:Loudspeaker transformer
1118:, or other high energy
982:, requires an external
857:Solid-state transformer
851:Solid-state transformer
490:) transformer, used in
331:let three wire (delta)
3030:Parametric transformer
2996:Instrument transformer
2952:Buck–boost transformer
2903:Dissolved gas analysis
2705:Douglas, Alan (1995).
2298:Cite journal requires
2269:. November 2020: 1–8.
2114:Buck–boost transformer
1941:
1777:
1653:tube (valve) amplifier
1636:
1616:
1052:
1044:
959:Specially constructed
923:
872:Instrument transformer
866:Instrument transformer
829:Cast resin transformer
786:
771:
660:Intermediate frequency
639:
488:intermediate frequency
389:
310:
275:
267:
215:
162:
123:
94:
74:between the windings.
3183:Electric transformers
3013:Isolation transformer
2991:Grounding transformer
2969:Delta-wye transformer
2848:Pressure relief valve
2053:Resolver (electrical)
1998:increased the tube's
1973:parasitic capacitance
1939:
1775:
1622:
1614:
1446:microwave frequencies
1381:Guanella transformers
1263:printed circuit board
1116:particle accelerators
1050:
1039:
913:
879:isolation transformer
844:isolation transformer
838:Isolating transformer
791:printed circuit board
777:
769:
668:Tank transformers in
650:electronic oscillator
640:
453:Further information:
447:Further information:
387:
329:earthing transformers
314:Grounding transformer
308:
273:
265:
258:Polyphase transformer
213:
160:
121:
84:
2485:. MEASUREMENT CANADA
2047:Resolver and synchro
1873:improve this article
1543:of mismatched line.
1238:Air-core transformer
1104:power semiconductors
1094:controllers. Larger
1075:circuits such as in
770:A planar transformer
718:Electrical breakdown
662:(IF) transformer in
533:
526:of 1' is as follows
443:Resonant transformer
320:Earthing transformer
161:Toroidal transformer
87:electric arc furnace
18:Resonant transformer
3142:Mitsubishi Electric
3060:Trigger transformer
3050:Scott-T transformer
3006:Voltage transformer
3001:Current transformer
2986:Flyback transformer
2818:Induction regulator
2638:Sound and recording
2098:Flyback transformer
1956:to their antennas.
1839:push–pull amplifier
1738:magnetic hysteresis
1729:harmonic distortion
1667:connect 2-wire and
1665:Bridge transformers
1572:(non-grounded) and
1521:only a quarter wave
1302:material made from
1244:very high frequency
906:Current transformer
900:Current transformer
503:gas discharge lamps
499:electronic ballasts
388:Leakage transformer
238:Induction regulator
232:Induction regulator
72:capacitive coupling
35:
3152:Schneider Electric
3070:Zigzag transformer
3040:Rotary transformer
3035:Planar transformer
3018:Austin transformer
2873:Short-circuit test
2853:Quadrature booster
2823:Leakage inductance
2124:Magnetic amplifier
2065:Resolvers produce
2012:Rotary transformer
2006:Rotary transformer
1954:radio transmitters
1942:
1928:hold it together.
1809:Output transformer
1778:
1750:leakage inductance
1748:without excessive
1691:professional audio
1684:magnetic shielding
1645:impedance matching
1637:
1617:
1334:Choke transformer
1286:impedance matching
1127:leakage inductance
1081:transmission lines
1073:telecommunications
1067:types are used in
1053:
1045:
1009:Hall effect sensor
924:
916:metering equipment
795:planar transformer
787:
772:
762:Planar transformer
670:radio transmitters
635:
394:leakage inductance
390:
346:Quadrature booster
311:
300:zigzag transformer
276:
268:
216:
163:
124:
95:
31:
3188:Electronics lists
3170:
3169:
2838:Open-circuit test
2647:978-0-240-52163-3
2574:Power electronics
2178:978-3-642-80580-6
2134:Saturable reactor
2102:cathode-ray tubes
2002:and selectivity.
1996:positive feedback
1905:
1904:
1897:
1754:stray capacitance
1607:Audio transformer
1550:, above, is very
1548:choke transformer
1505:transmission line
1442:radio frequencies
1402:transmission line
1356:cable, sometimes
1340:common mode choke
1278:current balancing
1220:into an earlier (
1057:pulse transformer
1032:Pulse transformer
933:protective relays
633:
632:
579:
578:
484:mutual inductance
469:radio frequencies
433:extra-low voltage
280:polyphase systems
248:power transformer
109:Power transformer
78:
77:
16:(Redirected from
3195:
3137:General Electric
2932:
2751:
2744:
2737:
2728:
2721:
2720:
2702:
2696:
2695:
2677:
2671:
2670:
2658:
2652:
2651:
2633:
2627:
2626:
2624:
2622:
2608:
2602:
2601:
2595:
2587:
2569:
2563:
2562:
2560:
2558:
2553:
2545:
2539:
2538:
2536:
2534:
2528:
2522:. Archived from
2521:
2513:
2507:
2501:
2495:
2494:
2492:
2490:
2484:
2476:
2470:
2469:
2463:
2455:
2453:
2452:
2446:
2440:. Archived from
2439:
2431:
2425:
2424:
2418:
2410:
2408:
2407:
2401:
2395:. Archived from
2394:
2386:
2380:
2379:
2377:
2376:
2370:
2363:
2352:
2346:
2341:
2335:
2332:
2326:
2325:
2314:
2308:
2307:
2301:
2296:
2294:
2286:
2263:
2257:
2250:
2244:
2237:
2231:
2221:
2215:
2200:
2194:
2193:
2186:
2180:
2170:
1900:
1893:
1889:
1886:
1880:
1857:
1849:
1538:
1536:
1535:
1532:
1529:
1467:
1465:
1464:
1461:
1458:
1207:
1195:frequencies) or
1171:
1164:
1163:
1159:
1143:
1135:switching losses
1129:and distributed
644:
642:
641:
636:
634:
631:
630:
621:
620:
608:
607:
589:
585:
580:
577:
576:
567:
566:
554:
550:
545:
544:
476:bandpass filters
426:magnetic ballast
374:electrical grids
333:polyphase system
67:
55:
43:
36:
21:
3203:
3202:
3198:
3197:
3196:
3194:
3193:
3192:
3173:
3172:
3171:
3166:
3120:
3074:
2947:Autotransformer
2933:
2924:
2898:Transformer oil
2878:Stacking factor
2868:Severity factor
2761:
2755:
2725:
2724:
2717:
2704:
2703:
2699:
2692:
2679:
2678:
2674:
2660:
2659:
2655:
2648:
2635:
2634:
2630:
2620:
2618:
2610:
2609:
2605:
2588:
2584:
2571:
2570:
2566:
2556:
2554:
2551:
2547:
2546:
2542:
2532:
2530:
2526:
2519:
2515:
2514:
2510:
2502:
2498:
2488:
2486:
2482:
2478:
2477:
2473:
2456:
2450:
2448:
2444:
2437:
2435:"Archived copy"
2433:
2432:
2428:
2411:
2405:
2403:
2399:
2392:
2390:"Archived copy"
2388:
2387:
2383:
2374:
2372:
2368:
2361:
2354:
2353:
2349:
2342:
2338:
2333:
2329:
2316:
2315:
2311:
2297:
2287:
2265:
2264:
2260:
2251:
2247:
2238:
2234:
2222:
2218:
2206:. McGraw Hill,
2201:
2197:
2188:
2187:
2183:
2171:
2167:
2162:
2129:Motor-generator
2110:
2094:
2075:
2059:
2051:Main articles:
2049:
2040:
2032:Main articles:
2030:
2014:
2008:
1934:
1922:
1910:
1901:
1890:
1884:
1881:
1870:
1858:
1847:
1835:
1819:
1811:
1770:
1714:valve amplifier
1609:
1601:radio receivers
1598:superheterodyne
1594:
1566:
1560:
1533:
1530:
1527:
1526:
1524:
1517:absolute values
1462:
1459:
1456:
1455:
1453:
1438:
1428:
1346:radio frequency
1342:
1336:
1328:electric fields
1324:magnetic fields
1271:
1240:
1232:radio receivers
1205:
1177:radio frequency
1173:
1169:
1161:
1157:
1156:
1137:
1034:
1023:
1017:
1000:
908:
902:
895:
891:
887:
874:
868:
859:
853:
840:
831:
807:
764:
746:
733:
727:
709:ignition system
622:
612:
599:
568:
555:
536:
531:
530:
525:
521:
517:
457:
451:
445:
439:installations.
410:
382:
366:
360:
348:
342:
322:
316:
260:
244:induction motor
240:
234:
222:
208:
194:autotransformer
189:
187:Autotransformer
183:
181:Autotransformer
155:
147:thermal cut-out
116:
111:
103:Michael Faraday
79:
33:Circuit symbols
28:
23:
22:
15:
12:
11:
5:
3201:
3199:
3191:
3190:
3185:
3175:
3174:
3168:
3167:
3165:
3164:
3159:
3154:
3149:
3144:
3139:
3134:
3128:
3126:
3122:
3121:
3119:
3118:
3113:
3108:
3106:Repeating coil
3103:
3101:Polyphase coil
3098:
3093:
3091:Induction coil
3088:
3082:
3080:
3076:
3075:
3073:
3072:
3067:
3062:
3057:
3052:
3047:
3042:
3037:
3032:
3027:
3022:
3021:
3020:
3010:
3009:
3008:
3003:
2993:
2988:
2983:
2982:
2981:
2971:
2966:
2965:
2964:
2954:
2949:
2943:
2941:
2935:
2934:
2927:
2925:
2923:
2922:
2917:
2912:
2911:
2910:
2905:
2895:
2890:
2885:
2880:
2875:
2870:
2865:
2860:
2855:
2850:
2845:
2840:
2835:
2830:
2825:
2820:
2815:
2813:High-leg delta
2810:
2805:
2800:
2795:
2793:Circle diagram
2790:
2785:
2780:
2778:Buchholz relay
2775:
2769:
2767:
2763:
2762:
2756:
2754:
2753:
2746:
2739:
2731:
2723:
2722:
2715:
2697:
2690:
2672:
2667:Sound on Sound
2653:
2646:
2628:
2603:
2582:
2564:
2540:
2508:
2496:
2471:
2426:
2381:
2347:
2336:
2327:
2322:www.comsol.com
2309:
2300:|journal=
2258:
2245:
2232:
2216:
2195:
2181:
2164:
2163:
2161:
2158:
2157:
2156:
2151:
2146:
2141:
2136:
2131:
2126:
2121:
2116:
2109:
2106:
2093:
2090:
2074:
2071:
2048:
2045:
2029:
2026:
2010:Main article:
2007:
2004:
1933:
1930:
1921:
1918:
1909:
1906:
1903:
1902:
1861:
1859:
1852:
1846:
1843:
1834:
1831:
1818:
1815:
1810:
1807:
1786:public address
1769:
1766:
1707:mixing console
1661:mixing console
1649:high impedance
1608:
1605:
1593:
1592:IF transformer
1590:
1562:Main article:
1559:
1556:
1490:self resonance
1427:
1424:
1423:
1422:
1419:
1412:
1409:geometric mean
1389:line isolators
1385:current baluns
1335:
1332:
1270:
1267:
1239:
1236:
1211:frequency band
1172:
1170:RF transformer
1167:
1122:applications.
1033:
1030:
1021:
1016:
1013:
999:
996:
969:high frequency
904:Main article:
901:
898:
893:
889:
885:
870:Main article:
867:
864:
855:Main article:
852:
849:
839:
836:
830:
827:
806:
803:
763:
760:
745:
742:
737:ferro-resonant
726:
723:
722:
721:
715:
705:induction coil
698:
692:
682:
680:Power inverter
677:
672:
666:
655:Applications:
646:
645:
629:
625:
619:
615:
611:
606:
602:
598:
595:
592:
588:
583:
575:
571:
565:
562:
558:
553:
548:
543:
539:
523:
519:
515:
444:
441:
409:
406:
381:
378:
362:Main article:
359:
356:
344:Main article:
341:
338:
318:Main article:
315:
312:
296:high leg delta
259:
256:
236:Main article:
233:
230:
218:Main article:
207:
204:
185:Main article:
182:
179:
154:
151:
115:
114:Laminated core
112:
110:
107:
76:
75:
68:
60:
59:
56:
48:
47:
44:
29:
26:
24:
14:
13:
10:
9:
6:
4:
3:
2:
3200:
3189:
3186:
3184:
3181:
3180:
3178:
3163:
3160:
3158:
3155:
3153:
3150:
3148:
3145:
3143:
3140:
3138:
3135:
3133:
3130:
3129:
3127:
3125:Manufacturers
3123:
3117:
3116:Trembler coil
3114:
3112:
3109:
3107:
3104:
3102:
3099:
3097:
3094:
3092:
3089:
3087:
3084:
3083:
3081:
3077:
3071:
3068:
3066:
3063:
3061:
3058:
3056:
3053:
3051:
3048:
3046:
3043:
3041:
3038:
3036:
3033:
3031:
3028:
3026:
3023:
3019:
3016:
3015:
3014:
3011:
3007:
3004:
3002:
2999:
2998:
2997:
2994:
2992:
2989:
2987:
2984:
2980:
2977:
2976:
2975:
2972:
2970:
2967:
2963:
2960:
2959:
2958:
2955:
2953:
2950:
2948:
2945:
2944:
2942:
2940:
2936:
2931:
2921:
2918:
2916:
2913:
2909:
2906:
2904:
2901:
2900:
2899:
2896:
2894:
2891:
2889:
2886:
2884:
2881:
2879:
2876:
2874:
2871:
2869:
2866:
2864:
2861:
2859:
2856:
2854:
2851:
2849:
2846:
2844:
2841:
2839:
2836:
2834:
2831:
2829:
2826:
2824:
2821:
2819:
2816:
2814:
2811:
2809:
2806:
2804:
2801:
2799:
2796:
2794:
2791:
2789:
2786:
2784:
2781:
2779:
2776:
2774:
2771:
2770:
2768:
2764:
2759:
2752:
2747:
2745:
2740:
2738:
2733:
2732:
2729:
2718:
2716:9781886606005
2712:
2708:
2701:
2698:
2693:
2687:
2683:
2676:
2673:
2668:
2664:
2657:
2654:
2649:
2643:
2639:
2632:
2629:
2617:
2613:
2607:
2604:
2599:
2593:
2585:
2583:9780070583894
2579:
2575:
2568:
2565:
2550:
2544:
2541:
2529:on 2013-10-21
2525:
2518:
2512:
2509:
2505:
2500:
2497:
2481:
2475:
2472:
2467:
2461:
2447:on 2013-01-24
2443:
2436:
2430:
2427:
2422:
2416:
2402:on 2014-01-24
2398:
2391:
2385:
2382:
2371:on 2008-04-14
2367:
2360:
2359:
2351:
2348:
2345:
2340:
2337:
2331:
2328:
2323:
2319:
2313:
2310:
2305:
2292:
2284:
2280:
2276:
2272:
2268:
2262:
2259:
2255:
2249:
2246:
2242:
2236:
2233:
2230:
2229:0-471-90096-6
2226:
2220:
2217:
2213:
2212:0-07-020974-X
2209:
2205:
2199:
2196:
2191:
2185:
2182:
2179:
2175:
2169:
2166:
2159:
2155:
2152:
2150:
2147:
2145:
2142:
2140:
2137:
2135:
2132:
2130:
2127:
2125:
2122:
2120:
2117:
2115:
2112:
2111:
2107:
2105:
2103:
2099:
2091:
2089:
2087:
2083:
2080:
2079:piezoelectric
2072:
2070:
2068:
2063:
2058:
2054:
2046:
2044:
2039:
2035:
2027:
2025:
2023:
2019:
2013:
2005:
2003:
2001:
1997:
1993:
1989:
1985:
1982:or "tickler"
1981:
1976:
1974:
1968:
1966:
1962:
1961:vario-coupler
1957:
1955:
1952:
1947:
1938:
1931:
1929:
1925:
1919:
1917:
1915:
1907:
1899:
1896:
1888:
1878:
1874:
1868:
1867:
1862:This section
1860:
1856:
1851:
1850:
1844:
1842:
1840:
1832:
1830:
1828:
1823:
1816:
1814:
1808:
1806:
1803:
1799:
1795:
1791:
1787:
1783:
1774:
1767:
1765:
1762:
1757:
1755:
1751:
1747:
1743:
1742:magnetic core
1739:
1735:
1730:
1725:
1723:
1719:
1715:
1710:
1708:
1704:
1700:
1696:
1692:
1687:
1685:
1681:
1677:
1672:
1670:
1666:
1662:
1658:
1654:
1650:
1646:
1642:
1634:
1630:
1629:octal sockets
1626:
1621:
1613:
1606:
1604:
1602:
1599:
1591:
1589:
1585:
1583:
1579:
1575:
1571:
1565:
1557:
1555:
1553:
1549:
1544:
1542:
1522:
1518:
1514:
1510:
1506:
1502:
1497:
1493:
1491:
1487:
1483:
1479:
1475:
1471:
1451:
1447:
1443:
1437:
1433:
1425:
1420:
1417:
1413:
1410:
1406:
1403:
1398:
1397:
1396:
1394:
1390:
1386:
1382:
1378:
1374:
1369:
1367:
1363:
1359:
1355:
1351:
1347:
1341:
1333:
1331:
1329:
1325:
1321:
1317:
1313:
1309:
1305:
1301:
1297:
1293:
1291:
1290:ferrite cored
1287:
1283:
1279:
1275:
1268:
1266:
1264:
1260:
1256:
1251:
1249:
1245:
1237:
1235:
1233:
1230:
1227:
1223:
1219:
1214:
1212:
1208:
1202:
1198:
1194:
1190:
1186:
1185:powdered iron
1180:
1178:
1168:
1166:
1155:of less than
1154:
1149:
1145:
1141:
1136:
1132:
1128:
1123:
1121:
1117:
1113:
1109:
1105:
1101:
1097:
1093:
1089:
1086:Medium-sized
1084:
1082:
1078:
1074:
1070:
1069:digital logic
1066:
1062:
1058:
1049:
1042:
1038:
1031:
1029:
1027:
1014:
1012:
1010:
1004:
997:
995:
992:
991:current clamp
987:
985:
981:
980:Rogowski coil
977:
973:
970:
967:, to measure
966:
962:
957:
956:transformer.
954:
949:
945:
940:
938:
934:
930:
921:
917:
912:
907:
899:
897:
882:
880:
873:
865:
863:
858:
850:
848:
845:
837:
835:
828:
826:
824:
820:
814:
812:
804:
802:
800:
796:
792:
784:
780:
779:Exploded view
776:
768:
761:
759:
756:
754:
750:
743:
741:
738:
732:
724:
719:
716:
714:
713:petrol engine
710:
706:
702:
701:Ignition coil
699:
696:
693:
690:
686:
683:
681:
678:
676:
673:
671:
667:
665:
661:
658:
657:
656:
653:
651:
627:
623:
617:
613:
604:
600:
596:
593:
586:
581:
573:
569:
563:
560:
556:
551:
546:
541:
537:
529:
528:
527:
512:
508:
504:
500:
495:
493:
489:
485:
481:
477:
474:
470:
466:
465:tuned circuit
462:
456:
450:
442:
440:
438:
434:
429:
427:
423:
419:
415:
407:
405:
402:
400:
395:
386:
379:
377:
375:
371:
365:
357:
355:
353:
352:electric grid
347:
339:
337:
334:
330:
326:
321:
313:
307:
303:
301:
297:
293:
289:
285:
281:
272:
264:
257:
255:
253:
249:
245:
239:
231:
229:
227:
221:
212:
205:
203:
199:
196:
195:
188:
180:
178:
175:
171:
168:
165:Donut-shaped
159:
152:
150:
148:
143:
139:
137:
133:
132:mains voltage
129:
120:
113:
108:
106:
104:
100:
92:
88:
83:
73:
69:
66:
62:
61:
57:
54:
50:
49:
45:
42:
38:
37:
34:
19:
2938:
2920:Vector group
2706:
2700:
2681:
2675:
2666:
2656:
2637:
2631:
2619:. Retrieved
2615:
2606:
2573:
2567:
2555:. Retrieved
2543:
2531:. Retrieved
2524:the original
2511:
2506:, AREVA 2002
2503:
2499:
2487:. Retrieved
2474:
2449:. Retrieved
2442:the original
2429:
2404:. Retrieved
2397:the original
2384:
2373:. Retrieved
2366:the original
2357:
2350:
2339:
2330:
2321:
2312:
2291:cite journal
2261:
2253:
2248:
2235:
2219:
2203:
2198:
2184:
2168:
2095:
2076:
2064:
2060:
2041:
2022:helical scan
2015:
1977:
1969:
1960:
1958:
1943:
1926:
1923:
1911:
1891:
1882:
1871:Please help
1866:verification
1863:
1836:
1824:
1820:
1812:
1801:
1797:
1793:
1779:
1758:
1726:
1711:
1688:
1673:
1641:audio signal
1638:
1595:
1586:
1567:
1545:
1498:
1494:
1480:. For upper
1439:
1388:
1384:
1380:
1372:
1370:
1343:
1294:
1274:Ferrite core
1272:
1252:
1241:
1229:regenerative
1215:
1181:
1174:
1150:
1146:
1124:
1120:pulsed power
1108:high voltage
1095:
1092:camera flash
1087:
1085:
1064:
1056:
1054:
1018:
1005:
1001:
988:
976:pulsed power
965:oscilloscope
958:
941:
925:
883:
875:
860:
841:
832:
815:
808:
794:
788:
757:
749:Ferrite core
747:
744:Ferrite core
734:
707:used in the
654:
647:
496:
458:
430:
411:
403:
391:
369:
367:
349:
328:
324:
323:
284:vector group
277:
241:
223:
200:
192:
190:
176:
172:
164:
144:
140:
136:eddy current
125:
96:
91:"interleaved
90:
32:
3086:Hybrid coil
2888:Tap changer
2828:Magnet wire
2758:Transformer
2489:12 December
2154:Transformer
2149:Three-phase
2139:Tap changer
2082:transducers
1965:transformer
1845:Other types
1782:loudspeaker
1722:loudspeaker
1703:bass guitar
1657:loudspeaker
1552:broadbanded
1224:) stage in
1199:(for upper
1138: [
1131:capacitance
920:three-phase
799:planar core
509:. Here the
418:neon lights
414:arc welding
288:phase angle
250:exploiting
99:transformer
3177:Categories
3111:Tesla coil
3096:Oudin coil
2788:Center tap
2691:0852968361
2451:2013-01-28
2406:2013-01-28
2375:2007-11-07
2192:. ECMwebs.
2160:References
2119:Center tap
2018:slip rings
1908:Transactor
1885:April 2021
1761:transistor
1734:coercivity
1574:unbalanced
1513:wavelength
1478:microstrip
1430:See also:
1414:The name "
1338:See also:
1310:, such as
1304:iron oxide
1255:inductance
1246:and upper
1191:and lower
1189:mediumwave
1153:duty cycle
1106:. Special
1026:substation
984:integrator
729:See also:
695:D'Arsonval
689:Paul Oudin
685:Oudin coil
675:Tesla coil
467:. Used at
2592:cite book
2283:227278364
1980:Armstrong
1509:impedance
1474:stripline
1405:impedance
1366:bandwidth
1312:magnesium
1282:see below
1248:shortwave
1201:shortwave
1193:shortwave
1061:amplitude
972:waveforms
944:insulated
697:apparatus
597:−
538:ω
480:bandwidth
325:Grounding
3147:ProlecGE
2858:Resolver
2843:Polarity
2833:Metadyne
2460:cite web
2415:cite web
2108:See also
1951:longwave
1946:inductor
1920:Hedgehog
1827:mu-metal
1802:100-volt
1746:windings
1699:DI boxes
1647:between
1570:balanced
1222:detector
1218:feedback
1077:Ethernet
1041:Bothhand
961:wideband
948:toroidal
929:metering
823:silicone
473:Q factor
461:resonant
437:doorbell
292:grounded
167:toroidal
153:Toroidal
3157:Siemens
2883:Synchro
2808:Growler
2783:Bushing
2621:June 8,
2092:Flyback
2057:Synchro
1914:reactor
1633:DI unit
1582:coaxial
1578:bifilar
1537:
1525:
1466:
1454:
1362:ferrite
1358:bifilar
1354:coaxial
1300:ceramic
1296:Ferrite
1226:antique
1197:ferrite
1160:⁄
935:in the
2766:Topics
2760:topics
2713:
2688:
2644:
2580:
2557:9 July
2533:9 July
2281:
2227:
2210:
2176:
1759:Early
1718:couple
1669:4-wire
1539:
1503:, any
1468:
1434:, and
1379:), or
1348:use, "
1320:nickel
1318:, and
1308:oxides
1284:) and
1250:work.
1065:signal
85:In an
3079:Coils
2939:Types
2773:Balun
2552:(PDF)
2527:(PDF)
2520:(PDF)
2483:(PDF)
2445:(PDF)
2438:(PDF)
2400:(PDF)
2393:(PDF)
2369:(PDF)
2362:(PDF)
2279:S2CID
1992:plate
1837:In a
1680:mains
1564:Balun
1558:Balun
1519:over
1476:, or
1416:choke
1387:, or
1383:, or
1350:choke
1187:(for
1142:]
1112:radar
1096:power
1088:power
711:of a
226:brush
3162:TBEA
2711:ISBN
2686:ISBN
2642:ISBN
2623:2016
2598:link
2578:ISBN
2559:2013
2535:2013
2491:2012
2466:link
2421:link
2304:help
2225:ISBN
2208:ISBN
2174:ISBN
2077:Two
2055:and
2036:and
2000:gain
1988:grid
1959:The
1800:and
1736:and
1541:wave
1484:and
1470:wave
1448:, a
1444:and
1344:For
1316:zinc
1071:and
931:and
918:for
819:PCBs
501:for
420:and
408:Uses
278:For
3132:ABB
2271:doi
1875:by
1798:70-
1794:25-
1752:or
1676:Hum
1580:or
1486:UHF
1482:VHF
1440:At
1259:VHF
953:tap
892:, Y
888:, X
842:An
811:oil
783:PCB
703:or
327:or
191:An
3179::
2665:.
2614:.
2594:}}
2590:{{
2462:}}
2458:{{
2417:}}
2413:{{
2320:.
2295::
2293:}}
2289:{{
2277:.
2096:A
2088:.
1796:,
1709:.
1528:1
1457:1
1395:.
1314:,
1265:.
1234:.
1140:de
1114:,
1055:A
1020:SF
1011:.
989:A
939:.
801:.
516:sc
459:A
428:.
368:A
2750:e
2743:t
2736:v
2719:.
2694:.
2669:.
2650:.
2625:.
2600:)
2586:.
2561:.
2537:.
2493:.
2468:)
2454:.
2423:)
2409:.
2378:.
2324:.
2306:)
2302:(
2285:.
2273::
2256:"
2239:"
1898:)
1892:(
1887:)
1883:(
1869:.
1534:4
1531:/
1463:4
1460:/
1280:(
1206:Q
1162:2
1158:1
1022:6
894:1
890:1
886:1
691:)
628:r
624:C
618:s
614:L
610:)
605:2
601:k
594:1
591:(
587:1
582:=
574:r
570:C
564:c
561:s
557:L
552:1
547:=
542:s
524:s
520:r
514:L
20:)
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
