Variacs are also known as autotransformers and are a speciality type of the electrical transformer that consists only one winding. The winding acts as both primary and secondary sides of the transformer. The ordinary type of transformers have 2 coils instead and they are not electrically connected. The one winding resolution allows for producing a smaller, lighter and cheaper transformers than ordinary 2 winding ones. They also feature lower leakage reactance, lower losses lower excitation current and increased VA rating for a given size and mass. At the other side, the disadvantage is a lack any electrical insulation between circuits. It can result in full input voltage applied to the output. Variacs/Autotransformers are commonly used for: Power transmission and distribution – Variacs ensure that voltage at the beginning of the power distribution line is equivalent to the voltage at the end of the line. Power conversions – Variacs are able to convert common domestic mains voltage bands that are in use across the world. For example 200 V to 250 V or 100 V to 130V. Audio systems – Autotransformers are used to adapt speakers to constant- voltage distribution and for matching impendence levels.
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Carroll & Meynell variable autotransformers have variable voltages
and are ideal for controlling AC voltages. The rotating arm with a carbon brush changes the output voltage.These variacs feature round carbon brushes, riding any imperfections, offering a smoother operation. The round ...
Description:
Carroll & Meynell 3 phase transformers provide a
trouble free and efficient way of varying and controlling AC voltages. Variation of the output voltage is achieved by a rotating arm and a carbon brush that rolls around a winding commutator.These ...
Description:
Carroll & Meynell 3 phase transformers(enclosed) provide a
trouble free and efficient way of varying and controlling AC voltages. Variation of the output voltage is achieved by a rotating arm and a carbon brush that rolls around a winding commutator.These ...
Description:
Carroll & Meynell Carryvolt autotransformer is an ideal
piece of portable test equipment for varying supply voltage. These carryvolt transformers have three optional output sockets to connect to the items being tested, they also incorporate meters for general indication. The ...