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Voltage transformer information


A 120:120 instrument isolation transformer showing two polarity marking conventions

Voltage transformers (VT), also called potential transformers (PT), are a parallel-connected type of instrument transformer. They are designed to present a negligible load to the supply being measured and have an accurate voltage ratio and phase relationship to enable accurate secondary connected metering.

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Voltage transformer

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Voltage transformers (VT), also called potential transformers (PT), are a parallel-connected type of instrument transformer. They are designed to present...

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Transformer

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voltage levels, such transformers being termed step-up or step-down type to increase or decrease voltage level, respectively. Transformers can also be used...

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Voltage regulator

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small voltage fluctuations, the motion of the solenoid core can be used to move a selector switch across a range of resistances or transformer windings...

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Transformer types

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most common type of transformer, widely used in electric power transmission and appliances to convert mains voltage to low voltage to power electronic...

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Current transformer

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Current transformers, along with voltage or potential transformers, are instrument transformers. Instrument transformers scale the large values of voltage or...

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Electrical substation

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different voltage levels. A substation may include transformers to change voltage levels between high transmission voltages and lower distribution voltages, or...

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Distribution transformer

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A distribution transformer or service transformer is a transformer that provides a final voltage transformation in the electric power distribution system...

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Tesla coil

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is an electrical resonant transformer circuit designed by inventor Nikola Tesla in 1891. It is used to produce high-voltage, low-current, high-frequency...

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Instrument transformer

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Instrument transformers are high accuracy class electrical devices used to isolate or transform voltage or current levels. The most common usage of instrument...

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Power supply

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power supply the AC input voltage passes through a power transformer and is then rectified and filtered to obtain a DC voltage. The filtering reduces the...

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Transformer oil

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used in oil-filled wet transformers, some types of high-voltage capacitors, fluorescent lamp ballasts, and some types of high-voltage switches and circuit...

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Flyback transformer

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switched-mode power supplies for both low (3 V) and high voltage (over 10 kV) supplies. The flyback transformer circuit was invented as a means of controlling the...

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Autotransformer

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between its windings as an ordinary transformer does; if the neutral side of the input is not at ground voltage, the neutral side of the output will...

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Power inverter

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converts DC to AC at battery level and uses a line-frequency transformer to create the output voltage. This is one of the simplest waveforms an inverter design...

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Zigzag transformer

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source. If one or more phases fault to earth, the voltage applied to each phase of the transformer is no longer in balance; fluxes in the windings no...

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Isolation transformer

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A transformer sold for isolation is often built with special insulation between primary and secondary, and is specified to withstand a high voltage between...

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Transformer oil testing

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portable test equipment on-site. The transformer oil (insulation oil) of voltage transformers and current transformers fulfills the purpose of insulating...

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Electric power distribution

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transmission voltage to medium voltage ranging between 2 kV and 33 kV with the use of transformers. Primary distribution lines carry this medium voltage power...

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Voltage converter

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components to create a power supply. AC voltage conversion uses a transformer. Conversion from one DC voltage to another requires electronic circuitry...

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Voltage regulation

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penetration, the diurnal voltage swings on the feeder were significantly reduced. One case of voltage regulation is in a transformer. The unideal components...

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High voltage

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High voltage electricity refers to electrical potential large enough to cause injury or damage. In certain industries, high voltage refers to voltage above...

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Lightning arrester

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can form part of large electrical transformers and can fragment during transformer ruptures. High-voltage transformer fire barriers are required to defeat...

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HVDC converter station

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The converter transformers step up the voltage of the AC supply network. Using a star-to-delta or "wye-delta" connection of the transformer windings, the...

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