Before its invention, the only way to convert AC current provided by utilities to DC was by using expensive, inefficient, and high-maintenance rotary converters or motor-generator sets.
42.
Given the right auxiliary and control equipment, an M-G set or rotary converter can be " run backwards ", converting DC to AC . Hence an inverter is an inverted converter.
43.
Rotary converters were used to convert alternating current ( AC ) to direct current ( DC ), or DC to AC power, before the advent of chemical or solid state power rectification and inverting.
44.
One way to envision what is happening in an AC-to-DC rotary converter is to imagine a rotary reversing switch that is being driven at a speed that is synchronous with the power line.
45.
Unlike the PRR's system, which included multiple power sources and an extensive high-voltage transmission network, the Reading's electrification was supplied solely by the rotary converter station at Wayne Junction.
46.
Although the converting machines are frequently called'rotary converters'or'rotary frequency converters', they are not the rotary converter used frequently by subways to convert low-frequency alternating current to DC power.
47.
Although the converting machines are frequently called'rotary converters'or'rotary frequency converters', they are not the rotary converter used frequently by subways to convert low-frequency alternating current to DC power.
48.
The converters used are more precisely described as motor generators and consist of two synchronous AC machines on a common shaft with different ratios of poles; they are not electrically connected as in a true rotary converter.
49.
Although ownership and operation of the system has changed, the system has remained essentially unchanged with the exception of the replacement of the rotary converter station at Wayne Junction with a solid-state cycloconverter in 1986.
50.
A "'rotary converter "', a type of motor generator, was used to convert alternating current ( AC ) to direct current ( DC ) for railway electrification from an AC power source.
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