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Topic: Autotransformer

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In the News (Tue 23 Jul 19)

  United States Patent: 4,481,663 - Spranger, Paul B.
The autotransformer is selected such that the input impedance between the ground or common connection of the autotransformer and the input at tap TP15 is equal to the value of inductor L8 (0.267 millihenrys) when the output of the autotransformer is open circuited.
Because of the autotransformer action, the requirement that the open circuit inductance at the input of autotransformer T13 be 0.267 millihenrys can also be considered to be the requirement that the open circuit inductance of the autotransformer be 0.835 millihenrys when viewed at the output terminals.
Autotransformer T13, of course, could be replaced by a two-winding transformer having a small short circuit input inductance and having an open circuit input inductance equivalent to an inductance of 0.267 millihenrys.
www.audioannals.com /04481663-Spranger-txt.htm   (1815 words)

  Autotransformer - Wikipedia, the free encyclopedia
Autotransformers are frequently used in power applications to interconnect systems operating at different voltage classes, for example 138 kV to 66 kV for transmission.
An autotransformer can be used to provide a slight boost (or step-up) to correct an undervoltage condition or buck (step-down) to correct an overvoltage condition.
As with two-winding transformers, autotransformers may be equipped with many taps and automatic switchgear to allow them to act as automatic voltage regulators, to maintain a steady voltage at the customers' service during a wide range of load conditions.
en.wikipedia.org /wiki/Autotransformer   (724 words)

 Adjusting Transformer Voltage with an Autotransformer
If the autotransformer is used to alter the power line voltage, then its secondary voltage changes the line voltage by the same amount as the secondary rating, in this case, 6.3V.
The autotransformer must have a secondary current rating at least equal to the primary current rating of the subject transformer.
When an autotransformer is used to boost voltage over a subject transformers design rating, limit the total VA of the subject transformer to its specified rating.
www.transcendentsound.com /adjusting_transformer_voltage_wi.htm   (474 words)

 Transformer - Wikipedia, the free encyclopedia
An autotransformer has only a single winding, which is tapped at some point along the winding.
AC or pulsed voltage is applied across a portion of the winding, and a higher (or lower) voltage is produced across another portion of the same winding.
By exposing part of the winding coils and making the secondary connection through a sliding brush, an autotransformer with a near-continuously variable turns ratio can be obtained, allowing for very small increments of voltage.
en.wikipedia.org /wiki/Transformer   (8425 words)

 why a glups
An autotransformer is a tapped winding transformer that changes the voltage available locally to the voltage required by a particular load.
An autotransformer, with a single tapped winding, is generally preferred to an isolation transformer, with 2 separate windings, for many reasons.
Autotransformers perform in much the same way as the transformer that the electric company uses to bring electricity to a building.
www.powerstarinc.com /geninfo.html   (1405 words)

 [No title]
An autotransformer is a type of transformer that has the primary
and output circuit is known as an autotransformer.
VA is equal to (voltage x current) of all of the secondary windings.
www.internetwalk.com /autotransformer/current_transformer.html   (239 words)

 Filtering and boosting a signal from a drive circuit patent invention
Also, in accordance with some embodiments of the invention, the autotransformer filter 116 also boosts an amplitude of the output 114 such that the amplitude of the output 114 is greater than (stepped up from or boosted from) the amplitude of the input 118.
The ability of the autotransformer filter 116 to both perform filtering and amplitude boosting tasks reduces complexity in the equipment used for providing signals down the cable 112 to the motor 104, since use of separate filter and transformer units can be avoided.
Boosting or stepping up of the amplitude of an output signal of the autotransformer filter 116 refers to receiving an input signal at the autotransformer filter 116 having a first amplitude, and increasing the amplitude to a second, greater amplitude that defines the amplitude of the output signal from the autotransformer 116.
www.freshpatents.com /Filtering-and-boosting-a-signal-from-a-drive-circuit-dt20061116ptan20060257266.php   (1897 words)

 » Autotransformer Has A Neutral   (Site not responding. Last check: 2007-10-19)
The autotransformer is thus employed to adjust the primary voltage applied to...
Annex B Zero-Sequence Impedance Equivalent Circuit for an Autotransformer With an Impedance-Grounded Neutral and a Delta-Connected Tertiary...
Grounding Transformer It is a special three-phase autotransformer for establishing a neutral on a 3-wire delta secondary.
www.autotransformer.info /Autotransformer-Has-A-Neutral   (194 words)

 Autotransformer   (Site not responding. Last check: 2007-10-19)
An autotransformer is not needed in a modern high...
The autotransformer provides an alternative means of extending the output voltage range of an inverting...
Autotransformer - Audio Terms Explained - A transformer designed with a single, tapped winding that serves as both primary and secondary.
staticmonitoring.minestatic.com /autotransformer   (650 words)

 Autotransformer Use: "Stealing Power?"
The most important motivation for using an autotransformer is that certain appliances, most notably an air conditioner, may overheat and shut off or suffer permanent damage if operated for long periods at a voltage substantially lower than normal.
But the use of an autotransformer when the campground voltage is low will indeed result in you getting more power at the expense of your neighbors, whose voltage will drop even lower when you turn on your autotransformer.
This is because when the autotransformer increases the inside voltage by 10%, (which is a 20% increase in power), it also must increase the current drawn from the power pedestal by a bit over 20%.
www.damouth.com /RVStuff/Autoform.shtml   (1192 words)

 Autotransformer Regulator Inverts 12V to -12V - Maxim/Dallas
Abstract: The autotransformer provides an alternative means of extending the output voltage range of an inverting DC-DC regulator besides using an external MOSFET or a flyback transformer.
With an autotransformer, the input-output voltage can be extended beyond the specification limit of the integrated circuit (IC).
Autotransformer T1 limits the voltage across IC1, allowing use of a high-efficiency chip (with 21V absolute-maximum voltage) in this inverting dc-dc regulator.
www.maxim-ic.com /appnotes.cfm/appnote_number/1016   (298 words)

 Hubbell Fire Pump Controls :: LXi-2300 Autotransformer with ATS
Model LXi-2300 is a combined automatic and manual reduced voltage autotransformer fire pump controller applied where the capacity of the power source does not permit full voltage starting of the motor.
A heavy-duty autotransformer is supplied with standard taps at 50%, 65% and 80% to reduce the starting voltage to the motor.
The autotransformer is factory wired to the 65% taps unless otherwise specified when ordered.
www.hubbell-icd.com /fpc/cfp/lxi2300.asp   (205 words)

This is a summary of an article on Autotransformer.
Each tap corresponds to a different voltage so that effectively a portion of the same inductor acts as part of both the primary and secondary winding.
For example connecting at the middle and bottom of the autotransformer will half the voltage.
wiki-shorts.freestat.pl /37-3038-Autotransformer.html   (419 words)

 Permanent split capacitor single phase electric motor system - Patent 4465962
An intermediate voltage tap on an autotransformer supplies voltage to the main winding for low speed operation while a capacitive voltage divider is used to adjust the voltage supplied to the auxiliary winding for low speed operation.
In this embodiment, autotransformer T1 is connected across line terminals 10 and 12 and is provided with intermediate voltage taps 18 and 20.
Autotransformer T2 is connected across line terminals 10 and 12 and includes an intermediate tap point 22.
www.freepatentsonline.com /4465962.html   (2538 words)

 Sola/Hevi-Duty: Buck-Boost Transformers
Each autotransformer 600 volts, nominal or less shall be protected by an individual overcurrent device installed in series with each ungrounded input conductor.
Such overcurrent device shall be rated or set at not more than 125 percent of the rated full-load input current of the autotransformer.
Where the rated input current of an autotransformer 9 amperes or more and 125 percent of this current does not correspond to a standard rating of a fuse or non-adjustable circuit breaker, the next higher standard rating described in Section 240-6 shall be permitted.
www.solaheviduty.com /products/transformers/BuckBoost/index.html   (641 words)

 Reduced-Voltage Autotransformer Starter Performance Misunderstood
While starting an AC induction motor at reduced voltage, the line current and motor current may or may not be the same, depending on the type of reduced voltage starter used.
However, in an autotransformer starter, the line current and motor current are not the same.
Using a motor with a 600% inrush current and connecting to the 50% voltage tap of the autotransformer, the motor current will be 300% (50% of 600%), but the line current will be only 150% (25% of 600%).
www.ecmweb.com /mag/electric_reducedvoltage_autotransformer_starter/index.html   (443 words)

 [No title]
A certain amount of the autotransformer's energy emanates from the
The secondary current rating of an autotransformer must be at least
amps should be used with an autotransformer with a secondary current
www.ca-newswire.com /autotransformer/autotransformer.html   (231 words)

 autotransformer description - the Electricity Forum   (Site not responding. Last check: 2007-10-19)
An autotransformer is an electrical transformer in which there is one winding, a portion of which is common to both the primary and the secondary circuits.
An autotransformer is commonly used for the voltage conversion of local power line voltage to some other Voltage value needed for a particular piece of electrical equipment.
An autotransformer is an efficient and quiet method for adjusting the voltage to incandescent lamps.
www.electricityforum.com /electrical-transformers/autotransformer.html   (483 words)

 IET Labs Variac Autotransformer
The Variac® autotransformer is an efficient, trouble­free device for controlling ac voltage and any other quan­tities that derive from ac voltage: heat output, light in­tensity, motor speed, and the outputs of various power supplies.
The Variac® adjustable autotransformers are grouped by line frequency, voltage, and phase, with brief specifications for each model.* Within each group, the units are listed in order of increasing load rating that can be expressed in either current (amperes) or power (kVA).
In their various combinations, type numbers for Variac autotransformers consist of letters and numerals that indicate exactly what elements are included in each assembly.
www.tequipment.net /IETVariacs.html   (1781 words)

netspændingen blev gradvist foroeget ved hjælp af en autotransformator (line voltage was progressively increased by an autotransformer).
de netspanning is langzamerhand opgevoerd door middel van een autotransformator (line voltage was progressively increased by an autotransformer).
a linha de tensão foi progressivamente aumentada por um autotransformador (line voltage was progressively increased by an autotransformer).
www.websters-online-dictionary.org /definition/english/au/autotransformer.html   (446 words)

 Magnetic Loop Antenna de AA8C
If the input impedance to the autotransformer is given as 50 ohms with the 16:1 impedance tap used, the result is an estimated load of 12,800 ohms on the resonator.
The one that I finally settled on as optimal is 4 turns, spaced two inches per turn, 8 inches deep, with the single turn, 47" wide pickup loop wound inside the main loop on holes in the horizontal and vertical central spars.
The tuning capacitor connects to, and resonates the main loop, and the pickup loop is connected to the autotransformer.
members.verizon.net /~vze24qhw/loop.html   (2530 words)

 Patents Results
The inventive roadtrain (autotransformer) consists of a truck provided with a multiseat or conventional cabin (saloon), a cargo platform and a semitrailer.
to the motor stator is increased by the turns ratio of the autotransformer thereby increasing the speed range of the motor.
An inexpensive autotransformer assembly adapted to withstand and operate under stingent conditions for permitting the flow of a fluid in both the axial and radial directions therethrough to cool both...
search.globalspec.com /Engineering-search/Patents/autotransformer   (313 words)

 Stereophile: Sonic Euphoria PLC passive line stage
Autotransformer, autoformer, tapped transformer—there are several names for the devices that the PLC uses as a volume control, and that distinguish it from the Placette and most other passive devices.
The output connections of the autotransformer are the same ground reference point as the input, and whichever of these intermediate taps is selected by the position of the volume knob.
Another benefit is that while a resistor attenuator always increases the output impedance of the source/attenuator combo, the autotransformer can actually lower the output impedance, better enabling the combo to drive long cables and power amps.
www.stereophile.com /solidpreamps/106sonic   (1133 words)

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